US3911080A Expired / Lapsed US ⏱️ 0.0 years remaining

Air pollution control

Assignee: WRIGHT H DUDLEY

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Filing: 1973-09-07

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Granted: 1975-10-07

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Expires: 1993-09-07

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Abstract

Abstract Air containing a pollutant, such as hydrogen sulfide, sulfur dioxide or an organic compound such as a mercaptan, an aldehyde, an amine, an alcohol, and the like, is contacted with a liquid impermeable module or cell having as a surface thereof a liquidimpermeable and gas-permeable membrane and containing an agent which reacts with the pollutant to convert it to one or more innocuous substances, whereby the pollutant passes through the membrane and is reacted with the agent, thus reducing the concentration of the pollutant in the air. The membrane is desirably comprised of an inorganic powder which may serve as an absorbent, preferably powdered activated carbon, dispersed in an inert, hydrophobic polymer such as polytetrafluoroethylene, and the reactive agent is desirably an aqueous solution of an oxidizing agent, preferably hydrogen peroxide. The module is preferably provided with means to regenerate the reactive agent which, in the case of aqueous solutions of oxidizing agents, can be an electrolytic cell in which the spent oxidizing agent is regenerated by electrolytic technique.

Inventors

👤 Wolfgang Mehl
👤 Kurt Halfar

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-10-24 18:53

CPC Classifications

B; B01; B01D; B01D69/00; B01D69/14; B01D69/141; B01D69/148; B01D53/00; B01D53/34; C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/467; C02F1/4672; C02F1/72; C02F1/46104; C02F1/46109

Claims Analysis

Total Claims: 13

Claim 1

Independent Claim 15 words

A method according to claim 1 wherein said reactant is an oxidant for said pollutant.

Claim 2

Dependent Claim 78 words

A method according to claim 2 wherein said oxidant is a member selected from the group consisting of ozone, hydrogen peroxide, hypochlorous acid and its salts, chlorous acid and its salts, chloric acid and its salts, perchloric acid and its salts, quinone, chlorine dioxide, chlorine trioxide, chlorine, bromine, hypobromic acid, bromic acid salts, hypoiodous acid, permanganate salts, manganic salts, cobaltic salts, ferric salts, thallic salts, ceric salts, bichromate salts, chloroiridic salts and vanadate (V(OH)4 and V2115 ) salts.

Claim 3

Dependent Claim 12 words

A method according to claim 3 wherein said oxidant is hydrogen peroxide.

Claim 4

Dependent Claim 12 words

A method according to claim 3 wherein said oxidant is ceric sulfate.

Claim 5

Dependent Claim 38 words

A method according to claim 2 in which said solution is a catholyte or anolyte for an electrolytic cell, including the step of passing a current between the anode and cathode of said cell to regenerate said oxidant.

Claim 6

Dependent Claim 12 words

A method according to claim 5 wherein hydrogen peroxide is said oxidant.

Claim 7

Dependent Claim 26 words

A method according to claim 1 wherein said semipermeable membrane comprises a member selected from the group consisting of activated carbon and graphite dispersed in polytetrafluoroethylene.

Claim 8

Independent Claim 185 words

A method for removing a pollutant from polluted air comprising bringing air containing said pollutant into contact with gas-permeable and liquid impermeable membrane comprising an inert, finely divided, inorganic solid selected from the group consisting of activated carbon, graphite, ceria, zinc oxide, alumina and magnesium oxide dispersed throughout a solid, inert, hydrophobic polymer, allowing said pollutant to pass from said air through said membrane and into contact with an aqueous solution containing an oxidant for said pollutant selected from the group consisting of ozone, hydrogen peroxide, hypochlorous acid and its salts, chlorous acid and its salts, chloric acid and its salts, perchloric acid and its salts, quinone, chlorine dioxide, chlorine trioxide, chlorine, bromine, hypobromic acid, bromic acid salts, hypoiodous acid, permanganate salts, manganic salts, cobaltic salts, ferric salts, thallic salts, ceric salts, bichromate salts, chloroiridic salts, and vanadate (V(OH)4 and VO2 ) salts, allowing reaction to occur between said oxidant and said pollutant, the period of contact of said air with said membrane being sufficient to reduce the concentration of said pollutant in said air, and thereafter withdrawing said air from contact with said membrane.

Claim 9

Dependent Claim 12 words

A method according to claim 9 wherein said oxidant is hydrogen peroxide.

Claim 10

Dependent Claim 12 words

A method according to claim 10 wherein said oxidant is ceric sulfate.

Claim 11

Dependent Claim 38 words

A method according to claim 9 in which said solution is a catholyte or anolyte for an electrolytic cell, including the step of passing a current between the anode and cathode of said cell to regenerate said oxidant.

Claim 12

Dependent Claim 12 words

A method according to claim 12 wherein hydrogen peroxide is said oxidant.

Claim 13

Dependent Claim 26 words

A method according to claim 9 wherein said semipermeable membrane comprises a member selected from the group consisting of activated carbon and graphite dispersed in polytetrafluoroethylene.

References Cited (Backward Citations)

US3335545A Cited

US3485743A Cited

US3447286A Cited

US3503186A Cited

US3819806A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-10-06	1979-04-07	1979-10-07	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-10-06	1983-04-07	1983-10-07	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-10-06	1987-04-07	1987-10-07	$7700.00	Window Closed / Lapsed

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