Air-permeable filtration media, methods of manufacture and methods of use

• US 7,416,581 B2
• Filed: 09/01/2005
• Issued: 08/26/2008
• Est. Priority Date: 09/03/2004
• Status: Active Grant

• Current Assignee: Point Source Solutions Incorporated
• Original Assignee: Point Source Solutions Incorporated
• Inventors: Raetz, Gregory J., Raetz, James A.
• Primary Examiner(s): LAWRENCE JR, FRANK M
• Application Number:
  US11/219,533
• Publication Number:
  US 20060054023A1
• Time in Patent Office: 1,090 Days
• Field of Search: 961/08, 961/34, 961/54, 95/90, 951/48, 555/24, 428323-331
• US Class Current: 95/90
• CPC Class Codes: B01D 2239/0407 comprising particulate additives, e.g. adsorbents
• CPC Class Codes: B01D 2239/0435 Electret
• CPC Class Codes: B01D 2239/0485 on particles
• CPC Class Codes: B01D 2239/10 Filtering material manufacturing
• CPC Class Codes: B01D 2239/1216 Pore size
• CPC Class Codes: B01D 2239/1233 Fibre diameter
• CPC Class Codes: B01D 2239/1241 Particle diameter
• CPC Class Codes: B01D 2253/102 Carbon
• CPC Class Codes: B01D 2253/106 Silica or silicates
• CPC Class Codes: B01D 2253/108 Zeolites
• CPC Class Codes: B01D 2253/202 Polymeric adsorbents
• CPC Class Codes: B01D 2253/206 Ion exchange resins
• CPC Class Codes: B01D 2253/304 Linear dimensions, e.g. particle shape, diameter
• CPC Class Codes: B01D 39/083 of organic material
• CPC Class Codes: B01D 39/1623 of synthetic origin
• CPC Class Codes: B01D 39/2055 Carbonaceous material solid sorbent compositions comprising free carbon B01J20/20
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes
• CPC Class Codes: B01J 20/28004 Sorbent size or size distribution, e.g. particle size
• CPC Class Codes: B01J 20/28019 Spherical, ellipsoidal or cylindrical
• CPC Class Codes: B01J 20/28023 : Fibres or filaments fibres or filaments in the form of membranes B01J20/28038; B01J20/28007 takes precedence
• CPC Class Codes: B01J 20/28028 : Particles immobilised within fibres or filaments
• CPC Class Codes: B01J 20/2803 : Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products
• CPC Class Codes: B01J 20/28033 : Membrane, sheet, cloth, pad, lamellar or mat
• CPC Class Codes: B01J 20/28038 : Membranes or mats made from fibers or filaments
• CPC Class Codes: B01J 20/28078 : Pore diameter
• CPC Class Codes: Y10T 442/2861 : Coated or impregnated synthetic organic fiber fabric

Abstract

The present invention provides an air-permeable filtration media that includes an air-permeable backing and an adsorbent. The adsorbent is at least partially embedded in the air-permeable backing. The present invention also provides a method of manufacturing an air-permeable filtration media. The present invention also provides a method of substantially removing contaminants form air, employing the air-permeable filtration media.

Claims

1. A method of substantially removing contaminants from air, the method comprising:

passing a stream of air though an air-permeable filtration media comprising an air-permeable backing and at least one adsorbent at least partially applied to the air-permeable backing without the use of a binding or adhesive composition, including passing the stream of air through an enhanced electrostatic charge formed from the at least partial application of the at least one adsorbent onto the air-permeable backing; and

removing one or more contaminants from the stream of air using, at least in part, the enhanced electrostatic charge.

2. The method of claim 1, wherein passing the stream of air through the air-permeable backing and the at least one adsorbent at least partially applied to the air-permeable backing without the use of the binding or adhesive composition includes minimizing one or both of degradation or oxidation of the binding or adhesive composition or the removed one or more contaminants.

3. The method of claim 1, wherein passing the stream of air through the air-permeable backing and the at least one adsorbent at least partially applied to the air-permeable backing without the use of the binding or adhesive composition includes increasing a life span of the air-permeable filtration media.

4. The method of claim 1, wherein the enhanced electrostatic charge formed from the at least partial application of the at least one adsorbent onto the air-permeable backing provides an increased affixation of the at least one adsorbent to the air-permeable backing.

5. The method of claim 1, wherein removing the one or more contaminants using the enhanced electrostatic charge includes increasing contaminant capture efficiency with little to no restriction to the passage of the stream of air through the air-permeable filtration media.

6. The method of claim 1, wherein passing the stream of air though the at least one adsorbent includes passing the stream of air through a plurality of adsorbents having an average diameter of about 10 microns or less.

7. The method of claim 1, wherein passing the stream of air through the at least one adsorbent includes passing the stream of air through a plurality of adsorbents having an average diameter of about 5 microns or less.

8. The method of claim 1, wherein passing the stream of air through the at least one adsorbent includes passing the stream of air through a plurality of adsorbents having an average diameter of about 1 micron or less.

9. A method of substantially removing contaminants from air, the method comprising:

passing a stream of air though an air-permeable filtration media comprising an air-permeable backing and at least one adsorbent applied to, and at least partially embedded within, the air-permeable backing without the use of a binding or adhesive composition, including passing the stream of air through an enhanced electrostatic charge formed from the at least partial embedding or application of the at least one adsorbent into the air-permeable backing, the at least one adsorbent having an average diameter of about 50 microns or less; and

removing one or more contaminants from the stream of air, including passing the stream of air at a rate and for a period effective to substantially remove the one or more contaminants.

10. The method of claim 9, wherein removing the one or more contaminants comprises removing at least one of acetaldehyde, acetic acid, acetic anhydride, acetone, acetylene, acrolein, acrylic acid, acrylonitrile, adhesives, alcoholic beverages, amines, ammonia, amyl acetate, amyl alcohol, amyl ether, animal odors, anesthetics, aniline, antiseptics, asphalt fumes, automobile exhaust, bathroom odors, butyric acid, beer, benzene, bleach, body odors, borane, bromine, burned flesh, burned food, burning fat, butadiene, butane, butanone, butter &

fats, butyl acetate, butyl alcohol, butyl cellosolve, butyl chloride, butyl ether, butylene, butyne, butyraidehyde, camphor, cancer odors, caprylic acid, carbolic acid, carbon disulfide, carbon dioxide, carbon monoxide, carbon tetrachloride, cat odors, cellosolve, cellosolve acetate, charred materials, cheese, chlorine, chlorobenzene, chlorobutadiene, chloroform, chloronitropropane, citrus and other fruits, cigarette smoke odor, cleaning compounds, coal smoke odor, combustion odors, cooking odors, corrosive gases, creosote, cresol, cyclohexane, cyclohexanol, cyclohexene, dead animals, decane, decaying matter, deodorants, detergents, dibromoethane, dichlorobenzene, dichloroethane, dichloroethyl ether, dichloronitroethane, dichloropropane, diesel fuels, diethylamine, dioxane, dipropyl ketone, disinfectants, dog odors, embalming odors, ethane, ether, ethyl acetate, ethyl acrylate, ethyl alcohol, ethyl amine, ethyl benzene, ethyl bromide, ethyl ether, ethyl formate, ethylene, ethyl mercaptan, ethyl silicate, ethylene chlorohydrin, ethylene dichloride, ethylene oxide, essential oils, eucalyptole, exhaust fumes, farm odors, fertilizer, film processing odors, fish odors, floral scents, fluorotrichloroethane, food aromas, formaldehyde, formic acid, fuel gasses, fumes, gangrene odor, garbage odors, garlic, gasoline, heptane, heptylene, hexane, hexylene, hexyne, hospital odors, household smells, hydrogen, hydrogen bromide hydrogen chloride, hydrogen cyanide, hydrogen fluoride, hydrogen iodide, hydrogen selenide, hydrogen sulfide, incense, indole, incomplete combustion, industrial wastes, iodine, iodoform, irritants, isophorone, isoprene, isopropyl acetate, isopropyl alcohol, isopropyl ether, kerosene, kitchen odors, lactic acid, lingering odors, liquid fuels, liquor odors, lubricating oils, medicinal odors, melons, menthol, mercaptans, mesityl oxide, methyl acetate, methyl acrylate, methyl alcohol, methyl bromide, methyl butyl ketone, methyl cellosolve, methyl chloride, methyl chloroform, methyl ether, methyl ethyl ketone, methyl isobutyl ketone, methyl mercaptan, methylcyclohexane, methylene chloride, mildew odors, mixed odors, mold, moth balls, naphtha, naphthalene, nicotine, nitric acid, nitrobenzenes, nitroethane, nitrogen dioxide, nitroglycerine, nitromethane, nitropropane, nitrotoluene, nonane, noxious gases, octalene, octane, odorants, onions, organic chemicals, ozone, packing house odors, paint odors, palmitic acid, paper deteriorations, paste and glue, pentane, pentyne, perchloroethylene, perfumes/cosmetics, perspiration, pet odors, phenol, phosgene, pitch, plastics, popcorn/candy, poultry odors, propane, propionic acid, propyl alcohol, propyl chloride, propyl ether, propyl mercaptan, putrefying substances, putrescine, pyridine, radiation products, radon, rancid oils, resins, ripening fruits, rubber, sauerkraut, sewer odors, skatole, slaughtering odors, smog, soaps, smoke, solvents, sour milk, spoiled food, stale odors, stockyards, stoddard solvent, stuffiness, styrene monomer, sulfur dioxide, sulfur trioxide, sulfuric acid, tar, tetrachloroethane, tetrachloroethylene, tobacco smoke odors, toilet odors, toluene, trichloroethylene, trichloroethane, turpentine, urea, uric acid, valeric acid, and vinegar and volatile organic compounds (VOC'"'"'s).

11. The method of claim 9, wherein removing the one or more contaminants includes removing up to about 90 wt. % of the contaminants from the stream of air.

12. The method of claim 9, wherein removing the one or more contaminants includes removing up to about 75 wt. % of the contaminants from the stream of air.

13. The method of claim 9, wherein removing the one or more contaminants includes removing at least about 30 wt. % of the contaminants from the stream of air.

14. The method of claim 9, wherein removing the one or more contaminants includes removing one or both of at least one particulate or at least one gaseous chemical compound from the stream of air.

15. The method of claim 14, wherein removing the at least one particulate from the stream of air includes capturing the at least one particulate.

16. The method of claim 14, wherein removing the at least one gaseous chemical compound from the stream of air includes adsorbing the at least one gaseous chemical compound.

17. The method of claim 9, wherein passing the stream of air through the at least one adsorbent includes passing the stream of air though a plurality of varied geometry adsorbents.

18. The method of claim 9, wherein passing the stream of air through the air-permeable backing and the at least one adsorbent includes passing the stream of air though at least one adsorbent forced into the air-permeable backing via a maintained pressure drop across a thickness of the air-permeable backing.

19. The method of claim 9, wherein passing the stream of air through the air-permeable backing and the at least one adsorbent includes eliminating the production of air borne pollutants resulting from the degradation and oxidation of the binding or adhesive composition or the removed one or more contaminants.

20. The method of claim 9, wherein passing the stream of air through the at least one adsorbent includes passing the stream of air through a plurality of adsorbents having an average diameter of about 15 microns or less.