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WO2007003450A1 - Procede de purification de dechets gazeux contenant des substances organiques volatiles et appareil utilise pour mettre en œuvre ce procede - Google Patents

Procede de purification de dechets gazeux contenant des substances organiques volatiles et appareil utilise pour mettre en œuvre ce procede Download PDF

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Publication number
WO2007003450A1
WO2007003450A1 PCT/EP2006/061541 EP2006061541W WO2007003450A1 WO 2007003450 A1 WO2007003450 A1 WO 2007003450A1 EP 2006061541 W EP2006061541 W EP 2006061541W WO 2007003450 A1 WO2007003450 A1 WO 2007003450A1
Authority
WO
WIPO (PCT)
Prior art keywords
volatile organic
organic substances
tower
atomizer
degreasing
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2006/061541
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English (en)
Inventor
Stefano Cappellotto
Vitaliano Vidali
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2007003450A1 publication Critical patent/WO2007003450A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B01D53/14—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 absorption
    • B01D53/1487—Removing organic compounds
    • 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
    • B01D53/14—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 absorption
    • B01D53/1493—Selection of liquid materials for use as absorbents
    • 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
    • B01D53/14—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 absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor

Definitions

  • the present invention relates to a method for purifying gaseous waste.
  • the invention also relates to an apparatus for performing such purification method.
  • the method and the apparatus according to the invention are particularly suitable for purifying air polluted by volatile organic substances originating from petroleum-derived products, such as solvents.
  • Pollution from organic solvent vapors is a problem which is particularly felt in many chemical industries but also in particular in painting apparatuses, such as those used in mechanical workshops, carpentry workshops, and other similar workplaces.
  • the European directive on environmental responsibility covers two sectors in which this responsibility is regulated with different degrees of strictness: as regards certain hazardous activities, such as for example the activities of a chemical industry, the general responsibility in case of environmental damage falls on the entrepreneur.
  • NOx nitrogen oxide
  • ozone is an ally of civilization at high altitudes, where it has a protective action against ultraviolet rays, at ground level it becomes a dangerous toxic substance, which destroys plants, irritates the respiratory tract and becomes a greenhouse gas.
  • Apparatuses with activated-carbon filters are currently known and used extensively to suppress organic solvent vapors.
  • the air with the polluting vapors is made to pass through said filters, which are constituted by beds of activated carbon.
  • the activated carbon thanks to its porous structure with a high adsorption capacity, retains by adhesion to the surface of the pores the substances dispersed in the air, until it is saturated.
  • the first of these drawbacks relates to the high costs for disposal or regeneration of saturated filters, followed by the high initial and running costs due to the nonetheless limited average absorption capacities of activated carbon and to the support that such an apparatus requires.
  • combustors are also used in which the gaseous pollutants are oxidized thermally within a closed combustion chamber. Although these combustors have advantages such as good efficiency as a function of the combustion temperature and of turbulence, they have important drawbacks, such as the high energy cost and the possible production of further pollutants (NOx, SO 2 , sulfurous acids, etcetera), which in turn have to be suppressed and disposed. Disclosure of the Invention
  • the aim of the present invention is to provide a method for purifying gaseous waste which is capable of obviating the drawbacks of known methods.
  • an object of the present invention is to provide an apparatus for performing a method according to the invention.
  • Another object of the present invention is to provide an apparatus that is at least as safe and efficient as known types.
  • Another object of the present invention is to provide an apparatus and therefore a method for purifying gaseous waste which can be produced economically with known technologies.
  • This aim and these and other objects, which will become better apparent hereinafter, are achieved by a method for purifying gaseous waste containing volatile organic substances and the like, comprising the steps of:
  • an apparatus for performing a method for purifying gaseous waste according to the invention comprises at least one scrubbing tower, into which air containing vapors of volatile organic substances or the like is injected through an inlet, at least one atomizer being provided on the opposite side with respect to said inlet to spray the air stream with the surfactant-based degreasing substance in order to suppress said volatile organic substances, said at least one atomizer being arranged between said inlet and the outlet.
  • Figure 1 is a front view of an apparatus according to the invention
  • Figure 2 is a top view of an apparatus according to the invention.
  • an apparatus for performing a method for purifying gaseous waste containing volatile organic substances and the like, according to the invention is generally designated by the reference numeral 10.
  • the apparatus 10 comprises at least one scrubbing tower 11, into which air containing vapors of volatile organic substances or the like is injected through an inlet 14.
  • an atomizer 15 which is suitable to spray the air stream with a surfactant-based degreasing substance in order to remove the volatile organic substances.
  • the atomizer 15 is suitable to spray the air stream in countercurrent.
  • Atomization in countercurrent facilitates the entrapment of the volatile organic substances by the sprayed degreasing substance.
  • the atomizer 15 is arranged between the inlet 14 and an outlet 16.
  • the inlet 14 is open on the lower part of the tower 11, while the outlet 16 is on the upper part, and therefore the air stream rises and the atomizer 15 acts downward, indeed in countercurrent.
  • a drop retention grid 17 which is suitable to limit the escape from the outlet 16 of the droplets of residual liquid generated by the reaction of the volatile organic substances with the atomized degreasing substance.
  • the bottom 18 of the scrubbing tower 11 is funnel-shaped in order to convey the residual liquid, which falls back into it toward a disposal tank 13.
  • the degreasing substance is sent to the nozzle of the atomizer 15 by means of a pressurized pipe 19, which in turn is connected to a pump 20 suitable to aspirate said degreasing substance from a supply tank.
  • the supply tank is constituted by the disposal tank 13 itself.
  • the residual liquid is collected on the bottom 18 and from there it is circulated by means of a supply tube 21 toward the tank 13.
  • the droplets of degreasing substance by reacting with the volatile organic substances that are present in the air stream, incorporate said organic substances, increasing their own volume.
  • the tank 13 which initially is only partially filled with degreasing substance diluted according to requirements, is sent to a suitable disposal facility when it is completely full.
  • the tower 11 is constituted by a sealed cylinder, the only openings of which are constituted by the inlet 14, the outlet 16 and the hole, on the bottom 18, for the tube 21 for feeding the tank 13, in addition to the passage for the pressurized tube 19 for feeding the atomizer 15.
  • the flow-rate of the air in input and its pressure, as well as the atomization pressure, the type of spray jet and the dimensions of the droplets that compose it are parameters which must be modulated depending on the quantity and type of the volatile organic substance to be suppressed and of the degreasing substance that is used.
  • the apparatus 10 can comprise a single tower 11 or, as shown in the figures, can be composed of a plurality of towers in series, in order to improve the suppression of volatile organic substances with a sequence of scrubbing operations.
  • the scrubbing tower 11 therefore can be associated in a modular manner with a further identical scrubbing tower 12, by means of a duct 22 which is suitable to draw the air stream that exits from the outlet 16 of the first tower 11 and to divert the stream toward the inlet 23 of the subsequent second tower 12.
  • the method for purifying gaseous waste containing volatile organic substances and the like that can be performed with the apparatus 10 described above comprises the steps of:
  • atomization is performed in countercurrent.
  • the degreasing substance is diluted according to requirements.
  • the surfactants of the degreasing substance are of a kind chosen among anionic, cationic, amphionic, nonionic surfactants or a combination of some of said surfactants.
  • the anionic surfactants of the degreasing substance are constituted selectively by alkyl benzene sulfonate, alkyl ethoxy sulfate, or a combination thereof.
  • nonionic surfactants which, as an alternative, constitute the degreasing substance are constituted by polyethoxylated fatty acids.
  • the anionic surfactants are present in the degreasing substance in a percentage comprised between 0.5% and 5%.
  • nonionic surfactants also are present in the degreasing substance in a percentage comprised between 0.5% and 5%.
  • Such anionic or nonionic surfactants react with the volatile organic substances that originate from the environment in which the painting operation has been performed and entrain the compound to the bottom of the tower by means of the droplets that convey them.
  • the invention thus described solves the problems noted in known types of apparatus and method for purifying gaseous waste containing volatile organic substances and the like.
  • the present invention provides an apparatus which is at least as safe and efficient as known types, since the only energy that it requires to operate is the energy for driving the supply pump of the atomizer.
  • the present invention provides a method and an apparatus which are cheaper than known ones, since there are no filters of any kind to be regenerated or disposed.
  • the present invention provides a method which can also be performed with products which are easily commercially available.
  • the present invention provides an apparatus which allows to dispose of the residual waste rapidly and in full safety by virtue of the sealed tank described above.
  • the present invention provides an apparatus and a method which do not emit pollutant waste vapors in turn, differently from known types, since the residual waste is liquid and is accumulated in the disposal tank.
  • the present invention provides an apparatus and a method for purifying gaseous waste containing volatile organic substances which can be produced cheaply with known technologies.
  • the materials employed may be any according to requirements and to the state of the art.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Gas Separation By Absorption (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'invention concerne un procédé de purification de déchets gazeux contenant des substances organiques volatiles et analogues, comprenant les étapes consistant à : - envoyer un courant d'air contenant des vapeurs de substances organiques volatiles ou analogues dans une colonne d'épuration (11), - atomiser sur ces vapeurs de substances organiques volatiles une substance dégraissante à base de tensioactifs ; - récupérer le liquide résiduel dans une cuve jetable (13).
PCT/EP2006/061541 2005-04-15 2006-04-12 Procede de purification de dechets gazeux contenant des substances organiques volatiles et appareil utilise pour mettre en œuvre ce procede Ceased WO2007003450A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD2005A000106 2005-04-15
ITPD20050106 ITPD20050106A1 (it) 2005-04-15 2005-04-15 Procedimento di depurazione per reflui gassosi contenenti sostanze organiche volatili e impianto per l'attuazione di tale procedimento

Publications (1)

Publication Number Publication Date
WO2007003450A1 true WO2007003450A1 (fr) 2007-01-11

Family

ID=36675976

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/061541 Ceased WO2007003450A1 (fr) 2005-04-15 2006-04-12 Procede de purification de dechets gazeux contenant des substances organiques volatiles et appareil utilise pour mettre en œuvre ce procede

Country Status (2)

Country Link
IT (1) ITPD20050106A1 (fr)
WO (1) WO2007003450A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104984635A (zh) * 2015-07-15 2015-10-21 天津大学 一种含挥发性有机物的废气处理装置
CN105289217A (zh) * 2015-02-15 2016-02-03 江苏恒联环境技术有限公司 一种废气中VOCs回收利用系统
CN114604922A (zh) * 2022-03-18 2022-06-10 浙江大学 表面活性剂抑制VOCs挥发进入光热蒸馏冷凝淡化水的方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4265642A (en) * 1979-03-01 1981-05-05 Abcor, Inc. Process of removal of solvent vapors
US4925462A (en) * 1987-03-10 1990-05-15 Arasin Gmbh Processes for removing organochemical components
US5017351A (en) * 1988-02-11 1991-05-21 Rafson Harold J Process for removing volatile organic compounds from air streams
US5378264A (en) * 1992-12-02 1995-01-03 Aluminum Company Of America Microemulsion formation in offgas scrubbing
WO2001066230A2 (fr) * 2000-03-03 2001-09-13 Steen Research, Llc Procede et dispositif d'utilisation de composes transformes de peroxyde d'hydrogene dans les eaux de traitement industriel
GB2402085A (en) * 2002-03-01 2004-12-01 Oiko Group Ltd Device for removing pollutants from exhaust gases

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4265642A (en) * 1979-03-01 1981-05-05 Abcor, Inc. Process of removal of solvent vapors
US4925462A (en) * 1987-03-10 1990-05-15 Arasin Gmbh Processes for removing organochemical components
US5017351A (en) * 1988-02-11 1991-05-21 Rafson Harold J Process for removing volatile organic compounds from air streams
US5378264A (en) * 1992-12-02 1995-01-03 Aluminum Company Of America Microemulsion formation in offgas scrubbing
WO2001066230A2 (fr) * 2000-03-03 2001-09-13 Steen Research, Llc Procede et dispositif d'utilisation de composes transformes de peroxyde d'hydrogene dans les eaux de traitement industriel
GB2402085A (en) * 2002-03-01 2004-12-01 Oiko Group Ltd Device for removing pollutants from exhaust gases

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105289217A (zh) * 2015-02-15 2016-02-03 江苏恒联环境技术有限公司 一种废气中VOCs回收利用系统
CN105289217B (zh) * 2015-02-15 2018-04-06 江苏恒联环境技术有限公司 一种废气中VOCs回收利用系统
CN104984635A (zh) * 2015-07-15 2015-10-21 天津大学 一种含挥发性有机物的废气处理装置
CN114604922A (zh) * 2022-03-18 2022-06-10 浙江大学 表面活性剂抑制VOCs挥发进入光热蒸馏冷凝淡化水的方法
CN114604922B (zh) * 2022-03-18 2022-12-20 浙江大学 表面活性剂抑制VOCs挥发进入光热蒸馏冷凝淡化水的方法

Also Published As

Publication number Publication date
ITPD20050106A1 (it) 2006-10-16

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