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WO1997037756A1 - Ensemble filtre, d'absorption ameliore, propre, rigide, lavable et compact - Google Patents

Ensemble filtre, d'absorption ameliore, propre, rigide, lavable et compact Download PDF

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Publication number
WO1997037756A1
WO1997037756A1 PCT/US1997/003757 US9703757W WO9737756A1 WO 1997037756 A1 WO1997037756 A1 WO 1997037756A1 US 9703757 W US9703757 W US 9703757W WO 9737756 A1 WO9737756 A1 WO 9737756A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
sorbent
layer
adsorbent
filter assembly
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/US1997/003757
Other languages
English (en)
Inventor
Edwin G. Dauber
Michael F. Stiles
Michael S. Winterling
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.)
WL Gore and Associates Inc
Original Assignee
WL Gore and Associates Inc
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 WL Gore and Associates Inc filed Critical WL Gore and Associates Inc
Priority to AU23209/97A priority Critical patent/AU2320997A/en
Publication of WO1997037756A1 publication Critical patent/WO1997037756A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B01D53/02—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
    • B01D53/04—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 with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • 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
    • B01J20/28014—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
    • B01J20/2803—Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products
    • 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
    • B01J20/28014—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
    • B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
    • 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
    • B01J20/28014—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
    • B01J20/2805—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
    • B01J20/28095—Shape or type of pores, voids, channels, ducts
    • B01J20/28097—Shape or type of pores, voids, channels, ducts being coated, filled or plugged with specific compounds
    • 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
    • B01D2253/20—Organic adsorbents
    • B01D2253/202—Polymeric adsorbents

Definitions

  • enclosures that contain sensitive instrumentation must maintain very clean environments in order to operate properly.
  • enclosures include: enclosures with sensitive optical surfaces or electronic connections that are sensitive to particulates and gaseous contaminants which can interfere with mechanical or electrical operation; data recording devices, such as computer hard disk drives that are sensitive to particles, organic vapors, and corrosive vapors; and electronic control boxes such as those used in automobiles that are sensitive to moisture buildup and corrosion, as well as contamination from both inside and outside the enclosures.
  • damage may result from external contaminates as well as out-gassing from internal components.
  • An indicator material may be provided within the sorbent core to determine the level of saturation of the sorbent by visually inspecting the sorbent core through a transparent film layer.
  • the filter layer can be hydrophobic such that the filter can be washed without extracting valuable water soluble salts used for chemisorption of acid vapors, or without fear of the transport of ions within the inner core to the filter surface.
  • the filter can also contain one or two layers of hot melt adhesive to facilitate manufacture of the filter and/or adhereing the filter to the housing.
  • the filter layer 10 may comprise any porous material that allows vapor contaminants to diffuse through it to the sorbent core 12
  • the filter layer 10 also keeps the sorbent material within the filter assembly 15
  • a hydrophobic filter layer 10 allows the filter assembly 15 to be washed in deionized (Dl) water to remove surface particulates and ions without extracting any water soluble chemical chemisorption treatments in the sorbent core and without allowing water transport of any ions from the sorbent core to the filter surface
  • Suitable filter layer materials may include, but are not limited to, polymeric non-shedding filter media or laminated filter media, a porous membrane of polypropylene, polyethylene, nylon, composites of polycarbonate and polyester, mixed cellulose esters, cellulose triacetate or laminates of the foregoing, for example
  • a preferred filter layer 10 for use in the present invention comprises a membrane of porous expanded polytetrafluoroethylene (PTFE)
  • PTFE porous polytetrafluoroethylene
  • PTFE porous polyt
  • a preferred embodiment of the sorbent core 12 utilizes a sorbent filled PTFE sheet wherein the sorbent particles are entrapped within a regular shaped PTFE structure, as taught by U.S. Patent No. 4,985,296, incorporated by reference Ideally, particles are packed in a multi-modal (e.g., bi-modal or t ⁇ -modal) manner, with particles of different sizes interspersed around one another to fill as much of the available void space between particles as is possible to maximize the amount of active material contained in the sorbent core 12 Also, multi-modal packing permits a number of sorbents to be filled into a single sorbent core 12.
  • a multi-modal e.g., bi-modal or t ⁇ -modal
  • F. jure 4 illustrates an alternate embodiment of the present invention where die cut or laser cut slots or cross marks 21 are incorporated into the filter for ease of attachment within an enclosure These can be at one end or both ends of the filter assembly Multiple attachments add rigidity in application but take up space that otherwise could be utilized with adsorbent In this embodiment, the property of reduced particulation due to resistance of the first film layer 14 (not shown) to tearing or fraying is even of more importance if the filter is attached with screws through the die cut marks Here again the seal area 22 must surround the cut marks to keep the adsorbent particulates contained
  • a filter layer tape was made in accordance with the above procedure except 1453 g of PFA solids in the form of a 22 7% aqueous dispersion was added to 50,000 g of H 2 0 7247 g of PTFE solids in the form of 23 7% aqueous dispersion was rapidly poured into the vessel
  • the PTFE dispersion used was type AD-059 obtained from ICI Americas, Inc After 1 minute of mixing, 14 6 g of polyethylene imine was added to induce co-coagulation Total mixing time was one minute and forty seconds
  • the cake was dried at 165 ⁇ C, chilled, screened, and lubricated at 0 175 g of mineral spints per gram of filled powder
  • the mixture was chilled, screened, left at ambient for 16 hours and then pelletized
  • the pellet was heated to 49 ⁇ C for 16 hours and extruded into tape form
  • the tape was calendared through rolls to 0 046 cm
  • the lubricant was removed by evaporating across heated rolls in 2 passes
  • the tape was expanded at a 2 1 ratio at 105 feet per minute (32 0 m/min) and a maximum temperature of 275°C
  • the tape was then stretched across two heated surfaces at 340°C at 25 1 and 2 1 expansion ratios and an output speed of 75 ft/mm (22 86 m/min)
  • the expanded tape was 0 0025 cm thick and approximately 0 7 g/cc
  • a 1 2 mil (0 03 mm) thick heat seal adhesive on 5 mil (0 127 mm) thick polyester film was purchased from Lamart

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Filtering Materials (AREA)

Abstract

La présente invention a pour objet un ensemble filtre d'absorption amélioré, propre, rigide, lavable et compact servant à absorber de façon sélective les agents contaminants contenus dans une enceinte. Ledit ensemble filtre comprend un noyau d'absorption contenant à l'intérieur une matière d'absorption des contaminants, une couche filtre et une couche film, ledit noyau d'absorption étant enrobé par ces deux couches. D'autres couches, telles qu'une couche de support de filtre et une ou deux couches à point de fusion bas, peuvent être ajoutées à la couche film. L'ensemble filtre peut également comprendre une substance chimique servant à indiquer la saturation du sorbant. De plus, un tel ensemble peut servir à canaliser l'air dans un filtre à particules, ce qui permet de maximiser l'efficacité d'absorption ainsi que l'efficacité du filtre de recirculation. L'ensemble filtre convient particulièrement à une utilisation dans une unité de disques informatiques ou dans toute autre enceinte similaire susceptible d'être contaminée par dégazage. Il peut être monté par des moyens divers. Il peut ainsi, mais pas exclusivement, être ajusté pour être bloqué entre les canaux 'C', être mis en place à l'aide de vis de fixation ou être soudé à sa place au moyen d'une colle de résine thermoplastique ou thermodurcissable.
PCT/US1997/003757 1996-04-08 1997-03-11 Ensemble filtre, d'absorption ameliore, propre, rigide, lavable et compact Ceased WO1997037756A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU23209/97A AU2320997A (en) 1996-04-08 1997-03-11 An improved clean, stiff, washable, compact adsorbent filter assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US62929696A 1996-04-08 1996-04-08
US08/629,296 1996-04-08

Publications (1)

Publication Number Publication Date
WO1997037756A1 true WO1997037756A1 (fr) 1997-10-16

Family

ID=24522411

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/003757 Ceased WO1997037756A1 (fr) 1996-04-08 1997-03-11 Ensemble filtre, d'absorption ameliore, propre, rigide, lavable et compact

Country Status (2)

Country Link
AU (1) AU2320997A (fr)
WO (1) WO1997037756A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998041989A1 (fr) * 1997-03-17 1998-09-24 Donaldson Company, Inc. Structure adsorbante et procede
US6143058A (en) * 1997-03-17 2000-11-07 Donaldson Company, Inc. Adsorbent construction and method
WO2001041901A1 (fr) * 1999-12-10 2001-06-14 Donaldson Company, Inc. Ensemble adsorbant comprenant une couche filtrante en polypropylene destinee a l'elimination de contaminants gazeux
EP1369173A1 (fr) * 2002-05-30 2003-12-10 Japan Gore-Tex, INC. Absorbant d'humidité et conteneur semi-hermétique
WO2017201096A1 (fr) * 2016-05-16 2017-11-23 Nitto Denko Corporation Dispositif d'adsorption d'humidité à base d'oxyde de graphène
US11976847B2 (en) 2022-03-22 2024-05-07 Danvita Thermal LLC Air purification system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225593A2 (fr) * 1985-12-03 1987-06-16 Kaken Pharmaceutical Co., Ltd. Matériau déshumidifiant
WO1991014496A1 (fr) * 1990-03-20 1991-10-03 W.L. Gore & Associates, Inc. Ensemble adsorbant eliminant des elements contaminants gazeux
US5069694A (en) * 1990-07-02 1991-12-03 Multiform Desiccants, Inc. Packet for compound treatment of gases
US5417743A (en) * 1994-01-21 1995-05-23 W. L. Gore & Associates, Inc. Self-adhesive vent filter and adsorbent assembly with a diffusion tube
WO1996006669A1 (fr) * 1994-08-30 1996-03-07 W. L. Gore & Associates, Inc. Filtre ameliore adsorbant, compact, non generateur de matieres particulaires

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225593A2 (fr) * 1985-12-03 1987-06-16 Kaken Pharmaceutical Co., Ltd. Matériau déshumidifiant
WO1991014496A1 (fr) * 1990-03-20 1991-10-03 W.L. Gore & Associates, Inc. Ensemble adsorbant eliminant des elements contaminants gazeux
US5069694A (en) * 1990-07-02 1991-12-03 Multiform Desiccants, Inc. Packet for compound treatment of gases
US5417743A (en) * 1994-01-21 1995-05-23 W. L. Gore & Associates, Inc. Self-adhesive vent filter and adsorbent assembly with a diffusion tube
WO1996006669A1 (fr) * 1994-08-30 1996-03-07 W. L. Gore & Associates, Inc. Filtre ameliore adsorbant, compact, non generateur de matieres particulaires

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998041989A1 (fr) * 1997-03-17 1998-09-24 Donaldson Company, Inc. Structure adsorbante et procede
US5876487A (en) * 1997-03-17 1999-03-02 Donaldson Company, Inc. Adsorbent construction; and, method
US6143058A (en) * 1997-03-17 2000-11-07 Donaldson Company, Inc. Adsorbent construction and method
WO2001041901A1 (fr) * 1999-12-10 2001-06-14 Donaldson Company, Inc. Ensemble adsorbant comprenant une couche filtrante en polypropylene destinee a l'elimination de contaminants gazeux
EP1369173A1 (fr) * 2002-05-30 2003-12-10 Japan Gore-Tex, INC. Absorbant d'humidité et conteneur semi-hermétique
WO2017201096A1 (fr) * 2016-05-16 2017-11-23 Nitto Denko Corporation Dispositif d'adsorption d'humidité à base d'oxyde de graphène
US11976847B2 (en) 2022-03-22 2024-05-07 Danvita Thermal LLC Air purification system
US12385658B2 (en) 2022-03-22 2025-08-12 Danvita Thermal LLC Air purification system

Also Published As

Publication number Publication date
AU2320997A (en) 1997-10-29

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