Robert A Ferrell

US Patent:

61904368, Feb 20, 2001

Filed:

Mar 5, 1999

Appl. No.:

9/263615

Inventors:

Wenchang Ji - Chalfont PA
Robert James Ferrell - Rutherford NJ
Arthur I. Shirley - Piscataway NJ

Assignee:

The BOC Group, Inc. - Murray Hill NJ

International Classification:

B01D 5322

US Classification:

95 45

Abstract:

An ozone-oxygen gas stream is introduced into feed side of a membrane separation unit containing an elastomeric polymer membrane. Ozone-enriched gas passes through the membrane to a permeate zone and is contacted with an ozone-reactive substance-containing gas stream in the permeate zone, thereby oxidizing the substances or is removed from the permeate zone. Removal of the ozone-enriched gas from the permeate zone may be effected by purging the permeate zone with an inert gas and/or evacuating the permeate zone. Ozone-enriched gas removed from the permeate zone may be mixed with a liquid or gas stream which contains ozone-reactive substances in, for example, a venturi device, thereby oxidizing the substances.

US Patent:

61970913, Mar 6, 2001

Filed:

Mar 5, 1999

Appl. No.:

9/263614

Inventors:

Wenchang Ji - Chalfont PA
Robert James Ferrell - Rutherford NJ
Piotr J. Sadkowski - Bridgewater NJ

Assignee:

The BOC Group, Inc. - Murray Hill NJ

International Classification:

B01D 5322

US Classification:

95 45

Abstract:

An ozone-oxygen gas stream produced by passing oxygen into an ozone generator is introduced into a membrane separation unit containing an ozone-permeable membrane. Ozone-enriched gas passes through the membrane and is recovered or it contacts a liquid or gas stream which contains ozone-reactive substances, thereby oxidizing the substances. The oxygen-enriched gas stream produced on the feed side of the membrane by permeation of ozone through the membrane is recycled to the ozone generator. Prior to being recycled, the oxygen-enriched stream may be purified to remove gaseous impurities which permeate through the membrane from the liquid or gas stream being treated.