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WO2010105420A1 - Sequencing air cleaning rejuvenation system - Google Patents

Sequencing air cleaning rejuvenation system Download PDF

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Publication number
WO2010105420A1
WO2010105420A1 PCT/CN2009/070859 CN2009070859W WO2010105420A1 WO 2010105420 A1 WO2010105420 A1 WO 2010105420A1 CN 2009070859 W CN2009070859 W CN 2009070859W WO 2010105420 A1 WO2010105420 A1 WO 2010105420A1
Authority
WO
WIPO (PCT)
Prior art keywords
air cleaning
adsorption
cleaning apparatus
air
rejuvenation
Prior art date
Application number
PCT/CN2009/070859
Other languages
French (fr)
Inventor
Chi Keung Rudy Chan
Yee Lam Chan
Lam Lung Yeung
Ka Tung Ho
Original Assignee
Rht Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rht Limited filed Critical Rht Limited
Priority to PCT/CN2009/070859 priority Critical patent/WO2010105420A1/en
Priority to CN200980157750.7A priority patent/CN102369025B/en
Publication of WO2010105420A1 publication Critical patent/WO2010105420A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/01—Deodorant compositions
    • A61L9/014—Deodorant compositions containing sorbent material, e.g. activated carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8678—Removing components of undefined structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
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    • B01J20/226—Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF]
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    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28016—Particle form
    • B01J20/28019—Spherical, ellipsoidal or cylindrical
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
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    • B01J20/2805—Sorbents inside a permeable or porous casing, e.g. inside a container, bag or membrane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28078—Pore diameter
    • B01J20/2808—Pore diameter being less than 2 nm, i.e. micropores or nanopores
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
    • A61L2209/10—Apparatus features
    • A61L2209/14—Filtering means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/015—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
    • A61L9/02—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air by heating or combustion
    • A61L9/03—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/104—Ozone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
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    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2253/106—Silica or silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2253/106—Silica or silicates
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
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    • B01D2253/302—Dimensions
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/91—Bacteria; Microorganisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
    • B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J2220/00—Aspects relating to sorbent materials
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
    • B01J2220/66—Other type of housings or containers not covered by B01J2220/58 - B01J2220/64

Definitions

  • the present invention relates to air cleaning, more particularly, to a method and apparatus for air cleaning.
  • U.S. Pat. No. 7,473,074 and 5,042,457 illustrate that dilution of air contaminants using fresh air is an effective way to maintain good indoor air quality.
  • assess to fresh air may not be possible due to site situation constraints, especially in cases where air duct and air delivery unit is difficult to be installed.
  • this approach cannot lead to the elimination of air contaminant while transferring the air contaminants to other areas that may eventually induce more serious air problems.
  • air purifier is an alternative solution for improvement of indoor air quality.
  • Most air purifiers consist of air delivery unit and filter.
  • the working principle at behind is that air contaminants are adsorbed by the filter when air is diverted into air purifier by the air delivery unit.
  • the drawbacks of this type of air purifier are:
  • Noise disturbance can be caused by the air delivery unit
  • the objective of this invention is to provide an air cleaning apparatus, which can remove air contaminants and bacteria but without causing disturbance towards environment and secondary pollution so that it can be widely used in various situations.
  • One aspect of the present invention is providing an air cleaning apparatus for the removal of air contaminants and bacteria in domestic, commercial or industrial areas.
  • the present invention of the air cleaning apparatus comprises a housing in which there are adsorption filter, rejuvenation chamber and reactive oxidizing generator. There may be one or more rejuvenation chambers inside the said housing. There is/are one or more adsorption filters and ROS generators in the said rejuvenation chamber.
  • the adsorption filter is removable from the rejuvenation chamber and portable for adsorption of air contaminants inside the porous structure of adsorption materials. After the adsorption filter is saturated with air contaminants, the adsorption filter is taken back into the chamber for rejuvenation. In the rejuvenation chamber, the ROS generator will generate oxidants for the decomposition of air contaminants and disinfection.
  • the present invention provides a rejuvenation system, in which the air contaminants and ROS are confined in the pores of adsorption materials. Unlike the gaseous phase reaction, they are held closely with each other (in the range of nanometer scale), thereby enhancing the efficiency of the ROS in decomposing air contaminants into non-harmful product such as water and carbon dioxide. Since the oxidized products are too small to be retained inside the pores, they will diffuse out from the pores for further adsorption of air contaminants.
  • heater can be installed inside the rejuvenation chamber of the air cleaning apparatus.
  • the heater can provide higher temperature within the chamber for enhancing the efficiency of disinfection, decomposition of air contaminant, and rejuvenation of adsorption material.
  • air delivery unit can be also deployed within the chamber such that ROS can be actively transferred towards adsorption filter for rejuvenation by air flow. °
  • the air cleaning method of the present invention comprises:
  • ROS are released from the generator for rejuvenation of the adsorption filter
  • the adsorption filter can be re-used again for further adsorption.
  • the present invention provides the adsorption process followed by remediation of trapped air contaminants in the rejuvenation chamber. These two stepwise processes can take place at different time, and in some cases at different location. Unlike the traditional air purifier, the present air cleaning apparatus operates in a way that no electricity and air delivery unit are needed during the adsorption process.
  • the period of rejuvenation process depends mainly on the amount of adsorbed air contaminants so that it is flexible in application and tunable in operation.
  • the rejuvenation of the adsorption filter is taken place at different location in flexible time.
  • the present invention will not induce any secondary pollution or release of ROS towards the treated environment that broadens its applications and operation constraints.
  • FIG.1 is a schematic diagram of air cleaning apparatus of the present invention.
  • FIG.2 is a schematic diagram of the adsorption filter of the present invention.
  • FIG.3 is a flow chart of operation procedure of the present invention.
  • FIG.4 is a schematic diagram of air cleaning apparatus of the present invention with installation of heater and air delivery unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • the present invention comprises of a housing 1 enclosing adsorption filters 2, rejuvenation chamber 3 and ROS generator 4.
  • the adsorption filters 2 and ROS generator 4 are positioned inside the rejuvenation chamber 3.
  • the ROS generated by the generator 4 can diffuse into the adsorption filters 2.
  • the housing 1 is sealed to avoid leakage of excessive ROS, air contaminant and bacteria during the rejuvenation process.
  • the adsorption filters 2 may be fixed or removable.
  • the adsorption filter 2 of the present invention comprises of porous enclosure 5 and adsorption materials 8.
  • the shape of the adsorption filter 2 can be rectangular, cylindrical, cubic or any kind of shape depending on the application.
  • the adsorption materials 8 are packed inside the porous enclosure 5, which comprises of a mechanical support framework 6 and air permeable layer 7.
  • the mechanical support framework 6 can be made from metal, wood or plastic which is forming the shape of adsorption filter.
  • the air permeable layer 7 can allow either air contaminants or ROS diffusing into the adsorption materials 8.
  • the material of the air permeable layer 7 can be cloth, metal or plastic.
  • the mesh size of the air permeable layer 7 has to be small enough to prevent the fall-off of the adsorption materials 8.
  • the adsorption materials 8 can be activated carbon, zeolite, metal oxide framework, alumina, silica or in mixture of the aforementioned adsorption materials.
  • the shape of the adsorption materials 8 can be spherical, cylindrical, rectangular, irregular or in the form of pellets and granules with length or diameter in the range of 1 to 10 mm.
  • the adsorption materials 8 can be sponge coated with adsorption granules or powders.
  • the absorption capacity of the adsorption materials 8 depends on pore size, shape, orientation of crystal structure, chemical nature, hydrophobicity and hydrophilicity.
  • the adsorption materials 8 can be activated carbon, zeolite, metal oxide framework, alumina, silica or in mixture of the aforementioned adsorption materials 8. It was known that air contaminants commonly found in domestic, commercial and industrial areas are with size between 4 to 20 Angstrom. In order to have an effective adsorption of air contaminants, the pore size of the adsorption material 8 is tuned in the range of 4 to 20 Angstrom. When the pore size is too small, air contaminants are too big to penetrate into the pores.
  • the property of the adsorption materials 8 can either be hydrophobic or hydrophilic or in physical mixture of both.
  • the hydrophobic materials are used for adsorption of non-polar air contaminants such as aromatic and aliphatic hydrocarbons.
  • the hydrophilic materials are mainly for adsorption of polar gas contaminants including hydrogen sulfide, ammonia, aldehyde and alkanol. Mixtures of both hydrophilic and hydrophobic materials can also be used for the enhancement of the adsorption capacity.
  • Catalysts (such as transition metals) can be incorporated into the porous structure of the adsorption materials 8 so as to enhance the rate of oxidation of air contaminants thanks to their catalytic properties.
  • the adsorption materials 8 in the present invention can be designed, chosen and engineered according to the nature of air contaminants.
  • the ROS generator 4 is positioned near the adsorption filters 2 so that ROS generated by the ROS generator 4 can diffuse into the adsorption filters 2 for catalytic oxidation.
  • the ROS generator 4 can be ion generator, radical generator such as hydroxyl radical, ozone generator, reactive oxidizing gas generator.
  • the ROS can be cation, anion, charged particles, ozone, radicals, or any other reactive oxidizing gases.
  • ROS can be generated by electrical method such as electrostatic precipitator and corona discharge, chemical and photolytic method such as UV. The choice and amount of ROS are determined by the nature and amount of air contaminants and bacteria.
  • FIG. 3 shows the steps of air cleaning method of the present invention.
  • the air cleaning method of the present invention comprises:
  • the adsorption filter absorbs air contaminants from the environment
  • ROS are released from the generator for rejuvenation of the adsorption filter
  • the adsorption filter can be re-used again for further adsorption.
  • two heaters 9 are installed inside the rejuvenation chamber 3 and positioned near the three adsorption filters 2.
  • An air delivery unit 10 is installed inside the rejuvenation chamber 3 and positioned near the ROS generator 4. The airflow generated by the air delivery unit is diverted towards the ROS generator 4.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Epidemiology (AREA)
  • Nanotechnology (AREA)
  • Materials Engineering (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

Sequencing air cleaning rejuvenation system relates to a method and apparatus for air cleaning. More specifically, air contaminants and bacteria are removed from polluted environment by adsorption until the adsorption filter (2) is nearly saturated. By employing such method and apparatus, the adsorption materials (8) are then refreshed in a rejuvenation chamber (3) by reacting with reactive oxidizing species. The rejuvenation process decomposes air contaminants into non-harmful products without causing secondary pollution. Since the adsorption and rejuvenation process are taken place separately, it causes no noise disturbance and no leakage of excess ROS. Comparing with conventional air purifier, the sequencing air cleaning rejuvenation system is relatively more versatile and can be applied in various situations, especially in case of no power supply.

Description

SEQUENCING AIR CLEANING REJUVENATION SYSTEM
FIELD OF THE INVENTION
[1] The present invention relates to air cleaning, more particularly, to a method and apparatus for air cleaning. BACKGROUND OF THE INVENTION
[2] Nowadays, no matter in domestic, commercial or industrial area, the problem of indoor air quality is getting more concern from people since it is recognized as the cause of human health hazard. Air contaminants such as volatile organic compounds, ammonia, hydrogen sulfide, bacteria, and virus can threaten human health. It is necessary to have a solution for these problems.
[3] U.S. Pat. No. 7,473,074 and 5,042,457 illustrate that dilution of air contaminants using fresh air is an effective way to maintain good indoor air quality. However, assess to fresh air may not be possible due to site situation constraints, especially in cases where air duct and air delivery unit is difficult to be installed. Furthermore, this approach cannot lead to the elimination of air contaminant while transferring the air contaminants to other areas that may eventually induce more serious air problems.
[4] Illustrated by U.S. Pat. No. 6,152,996, 5,350,444 and 7,316,736, air purifier is an alternative solution for improvement of indoor air quality. Most air purifiers consist of air delivery unit and filter. The working principle at behind is that air contaminants are adsorbed by the filter when air is diverted into air purifier by the air delivery unit. The drawbacks of this type of air purifier are:
[5] Air contaminants will be adsorbed in the filter which may cause secondary pollution;
[6] Power supply is required for the air delivery unit;
[7] Noise disturbance can be caused by the air delivery unit;
[8] The size of this type of air purifier is large due to the presence of the air delivery unit.
[9] The objective of this invention is to provide an air cleaning apparatus, which can remove air contaminants and bacteria but without causing disturbance towards environment and secondary pollution so that it can be widely used in various situations.
SUMMARY OF THE INVENTION
[10] One aspect of the present invention is providing an air cleaning apparatus for the removal of air contaminants and bacteria in domestic, commercial or industrial areas.
[11] The present invention of the air cleaning apparatus comprises a housing in which there are adsorption filter, rejuvenation chamber and reactive oxidizing generator. There may be one or more rejuvenation chambers inside the said housing. There is/are one or more adsorption filters and ROS generators in the said rejuvenation chamber.
[12] The adsorption filter is removable from the rejuvenation chamber and portable for adsorption of air contaminants inside the porous structure of adsorption materials. After the adsorption filter is saturated with air contaminants, the adsorption filter is taken back into the chamber for rejuvenation. In the rejuvenation chamber, the ROS generator will generate oxidants for the decomposition of air contaminants and disinfection.
[13] The present invention provides a rejuvenation system, in which the air contaminants and ROS are confined in the pores of adsorption materials. Unlike the gaseous phase reaction, they are held closely with each other (in the range of nanometer scale), thereby enhancing the efficiency of the ROS in decomposing air contaminants into non-harmful product such as water and carbon dioxide. Since the oxidized products are too small to be retained inside the pores, they will diffuse out from the pores for further adsorption of air contaminants.
[14] Alternatively, heater can be installed inside the rejuvenation chamber of the air cleaning apparatus. The heater can provide higher temperature within the chamber for enhancing the efficiency of disinfection, decomposition of air contaminant, and rejuvenation of adsorption material. In addition, air delivery unit can be also deployed within the chamber such that ROS can be actively transferred towards adsorption filter for rejuvenation by air flow.°
[15] The air cleaning method of the present invention comprises:
[16] 1) The adsorption filter is taken out from the rejuvenation chamber of the air cleaning apparatus;
[17] 2) The adsorption filter absorbs air contaminants from the environment^
[18] 3) The adsorption filter is placed back into the rejuvenation chamber of the air cleaning apparatus;
[19] 4) ROS are released from the generator for rejuvenation of the adsorption filter;
[20] 5) The adsorption filter can be re-used again for further adsorption.
[21] The present invention provides the adsorption process followed by remediation of trapped air contaminants in the rejuvenation chamber. These two stepwise processes can take place at different time, and in some cases at different location. Unlike the traditional air purifier, the present air cleaning apparatus operates in a way that no electricity and air delivery unit are needed during the adsorption process.
[22] Furthermore, different size and shape of the adsorption filter can be designed and manufactured according to application. Other advantages involve small disturbance to the environment such as air flow and no noise generation.
[23] Being nearly saturated with air contaminants, the adsorption filter is rejuvenated by
ROS and no needed to be disposed like the conventional activated carbon deodorizer. The period of rejuvenation process depends mainly on the amount of adsorbed air contaminants so that it is flexible in application and tunable in operation.
[24] On the other hand, the rejuvenation of the adsorption filter is taken place at different location in flexible time. Thus, the present invention will not induce any secondary pollution or release of ROS towards the treated environment that broadens its applications and operation constraints.
[25] By employing the method and apparatus for air cleaning according to the present invention, air contaminants and bacteria can be removed from polluted environment by adsorption until the adsorption material is nearly saturated. The adsorption materials are then rejuvenated in a rejuvenation chamber by reacting with reactive oxidizing species. The rejuvenation process decomposes air contaminants into non-harmful products without causing secondary pollution. Since the adsorption and rejuvenation process can be taken place separately, it causes no noise disturbance and no leakage of excess ROS. Comparing with conventional air purifier, the present invention is relatively more versatile and can be applied in various situations, especially in case of no power supply. BRIEF DESCRIPTION OF THE DRAWINGS
[26] The following drawings illustrate preferred, but not exclusive embodiments of the inventions :
[27] FIG.1 is a schematic diagram of air cleaning apparatus of the present invention;
[28] FIG.2 is a schematic diagram of the adsorption filter of the present invention;
[29] FIG.3 is a flow chart of operation procedure of the present invention;
[30] FIG.4 is a schematic diagram of air cleaning apparatus of the present invention with installation of heater and air delivery unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[31] These and other advantage, aspect and novel features of the present invention, as well as details of an illustrated embodiment thereof, will be more fully understand from the following description and drawings. While various embodiments of the present invention has been presented by way of example only, and not limitation.
[32] In one embodiment (FIG.l) the present invention comprises of a housing 1 enclosing adsorption filters 2, rejuvenation chamber 3 and ROS generator 4. The adsorption filters 2 and ROS generator 4 are positioned inside the rejuvenation chamber 3. The ROS generated by the generator 4 can diffuse into the adsorption filters 2. The housing 1 is sealed to avoid leakage of excessive ROS, air contaminant and bacteria during the rejuvenation process. In such example, the adsorption filters 2 may be fixed or removable.
[33] In another embodiment (FIG.2), the adsorption filter 2 of the present invention comprises of porous enclosure 5 and adsorption materials 8. The shape of the adsorption filter 2 can be rectangular, cylindrical, cubic or any kind of shape depending on the application. The adsorption materials 8 are packed inside the porous enclosure 5, which comprises of a mechanical support framework 6 and air permeable layer 7. The mechanical support framework 6 can be made from metal, wood or plastic which is forming the shape of adsorption filter. The air permeable layer 7 can allow either air contaminants or ROS diffusing into the adsorption materials 8. The material of the air permeable layer 7 can be cloth, metal or plastic. The mesh size of the air permeable layer 7 has to be small enough to prevent the fall-off of the adsorption materials 8. The adsorption materials 8 can be activated carbon, zeolite, metal oxide framework, alumina, silica or in mixture of the aforementioned adsorption materials. The shape of the adsorption materials 8 can be spherical, cylindrical, rectangular, irregular or in the form of pellets and granules with length or diameter in the range of 1 to 10 mm. Also, the adsorption materials 8 can be sponge coated with adsorption granules or powders.
[34] The absorption capacity of the adsorption materials 8 depends on pore size, shape, orientation of crystal structure, chemical nature, hydrophobicity and hydrophilicity. The adsorption materials 8 can be activated carbon, zeolite, metal oxide framework, alumina, silica or in mixture of the aforementioned adsorption materials 8. It was known that air contaminants commonly found in domestic, commercial and industrial areas are with size between 4 to 20 Angstrom. In order to have an effective adsorption of air contaminants, the pore size of the adsorption material 8 is tuned in the range of 4 to 20 Angstrom. When the pore size is too small, air contaminants are too big to penetrate into the pores. On the contrary, when the pore size is too big, air contaminants are too small to be confined inside the pores. The property of the adsorption materials 8 can either be hydrophobic or hydrophilic or in physical mixture of both. The hydrophobic materials are used for adsorption of non-polar air contaminants such as aromatic and aliphatic hydrocarbons. The hydrophilic materials are mainly for adsorption of polar gas contaminants including hydrogen sulfide, ammonia, aldehyde and alkanol. Mixtures of both hydrophilic and hydrophobic materials can also be used for the enhancement of the adsorption capacity. Catalysts (such as transition metals) can be incorporated into the porous structure of the adsorption materials 8 so as to enhance the rate of oxidation of air contaminants thanks to their catalytic properties. In summary, the adsorption materials 8 in the present invention can be designed, chosen and engineered according to the nature of air contaminants.
[35] In other embodiment (FIG. 1), the ROS generator 4 is positioned near the adsorption filters 2 so that ROS generated by the ROS generator 4 can diffuse into the adsorption filters 2 for catalytic oxidation. The ROS generator 4 can be ion generator, radical generator such as hydroxyl radical, ozone generator, reactive oxidizing gas generator. The ROS can be cation, anion, charged particles, ozone, radicals, or any other reactive oxidizing gases. ROS can be generated by electrical method such as electrostatic precipitator and corona discharge, chemical and photolytic method such as UV. The choice and amount of ROS are determined by the nature and amount of air contaminants and bacteria.
[36] FIG. 3 shows the steps of air cleaning method of the present invention.
[37] The air cleaning method of the present invention comprises:
[38] 1) The adsorption filter is taken out from the rejuvenation chamber of the air cleaning apparatus;
[39] 2) The adsorption filter absorbs air contaminants from the environment;
[40] 3) The adsorption filter is placed back into the rejuvenation chamber of the air cleaning apparatus;
[41] 4) ROS are released from the generator for rejuvenation of the adsorption filter;
[42] 5) The adsorption filter can be re-used again for further adsorption.
[43] In other embodiment (FIG. 4), two heaters 9 are installed inside the rejuvenation chamber 3 and positioned near the three adsorption filters 2. An air delivery unit 10 is installed inside the rejuvenation chamber 3 and positioned near the ROS generator 4. The airflow generated by the air delivery unit is diverted towards the ROS generator 4. [44] The foregoing description is just the preferred embodiment of the invention. It is not intended to limit the invention. Any modifications, variations, and amelioration without departing from the spirit and scope of the present invention should be included in the scope of the prevent invention.

Claims

[1] An air cleaning apparatus, which comprising: a housing, a rejuvenation chamber enclosed by the housing, wherein there are an adsorption filter and a ROS generator positioned inside the rejuvenation chamber, and ROS generated by the
ROS generator diffuses into the adsorption filter. [2] The air cleaning apparatus as in claim 1, wherein the adsorption filter is removable from the rejuvenation chamber and portable for adsorption of air contaminants. [3] The air cleaning apparatus as in claim 1, wherein the housing encloses one or more rejuvenation chambers; the rejuvenation chamber encloses one or more adsorption filters; and the rejuvenation chamber encloses one or more ROS generators. [4] The air cleaning apparatus as in claim 1, wherein the shape of the adsorption filter is rectangular, spherical, cylindrical or cubic. [5] The air cleaning apparatus as in claims 1, wherein the adsorption filter comprises a porous enclosure and adsorption materials. [6] The air cleaning apparatus as in claim 5, wherein the adsorption materials are packed inside the porous enclosure. [7] The air cleaning apparatus as in claim 5, wherein the adsorption materials are activated carbon, zeolite, metal oxide framework, alumina, silica or in mixture of the aforementioned adsorption materials. [8] The air cleaning apparatus as in claim 5, wherein the shape of adsorption materials is spherical, cylindrical, rectangular, irregular or in the form of granule and pellet. [9] The air cleaning apparatus as in claim 5, wherein the adsorption materials are sponge coated with adsorption granules or powders. [10] The air cleaning apparatus as in claim 5, wherein the size of the adsorption materials is in the range of 1 to 10 mm. [11] The air cleaning apparatus as in claim 5, wherein the pore size of the adsorption materials is in the range of 4 to 20 Angstrom. [12] The air cleaning apparatus as in claim 5, wherein the adsorption materials are hydrophobic, hydrophilic or in a mixture of both. [13] The air cleaning apparatus as in claim 5, wherein the porous structure of the adsorption materials is incorporated with catalysts to enhance the rate of oxidation of air contaminant. [14] The air cleaning apparatus as in claim 13, wherein the catalysts are transition metals. [15] The air cleaning apparatus as in claim 5, wherein the porous enclosure comprises a mechanical support framework and an air permeable layer. [16] The air cleaning apparatus as in claim 15, wherein the materials of the mechanical support framework are metal, wood or plastic. [17] The air cleaning apparatus as in claim 15, wherein the materials of air permeable layer are cloth, metal or plastic. [18] The air cleaning apparatus as in claims 10, wherein the pore size of the air permeable layer is smaller than the pore size of the adsorption materials. [19] The air cleaning apparatus as in claim 1, wherein the ROS is either cation, anion, charged particles, ozone, radicals, hydroxyl radicals or reactive oxidizing gases. [20] The air cleaning apparatus as in claim 19, wherein the ROS generator generates either cation, anion, charged particles, ozone, radicals, hydroxyl radicals or reactive oxidizing gases. [21] The air cleaning apparatus as in claim 20, wherein the ROS is generated by electrical, chemical or photolytic method. [22] The air cleaning apparatus as in claim 5, wherein the air contaminants are confined inside the pores of the adsorption materials. [23] The air cleaning apparatus as in claims 22, wherein the ROS decompose the confined air contaminants into non-harmful products and rejuvenate the pores of the adsorption materials. [24] The air cleaning apparatus as in claim 1, wherein an additional heater is installed in the rejuvenation chamber to increase the temperature for rejuvenation. [25] The air cleaning apparatus as in claim 1, wherein an additional air delivery unit is installed in the rejuvenation chamber to generate airflow for the enhancement of rejuvenation. [26] A air cleaning method, wherein, comprising:
51) The adsorption filter is taken out from the rejuvenation chamber of the air cleaning apparatus;
52) The adsorption filter absorbs air contaminants from the environment;
53) The adsorption filter is placed back into the rejuvenation chamber of the air cleaning apparatus;
54) ROS are released from the generator for rejuvenation of the adsorption filter;
55) The adsorption filter is re-used again for further adsorption.
PCT/CN2009/070859 2009-03-18 2009-03-18 Sequencing air cleaning rejuvenation system WO2010105420A1 (en)

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CN200980157750.7A CN102369025B (en) 2009-03-18 2009-03-18 Sequential Air Purification Renewal System

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WO2017081221A1 (en) 2015-11-13 2017-05-18 Raumedic Ag Neutralization additive for silicone having an adsorbent and a catalytic material for neutralizing and cleaving odor-forming molecules
CN114017888A (en) * 2021-11-23 2022-02-08 广东新内科技有限公司 Multipurpose air environment purifier with active adsorption and catalysis pollutant function cover

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CN114017888B (en) * 2021-11-23 2022-11-22 广东新内科技有限公司 Multipurpose air environment purifier with active adsorption and catalysis pollutant function cover

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