Richard S Gregory

US Patent:

57050902, Jan 6, 1998

Filed:

Sep 6, 1996

Appl. No.:

8/708978

Inventors:

Paul Garland - Aylesbury, GB
Craig Norman Schubert - Belle Mead NJ
Richard Alan Gregory - Belle Mead NJ
Eduardo Garcia-Rameau - Houston TX
Rickey Epps - Houston TX
David Burns - The Woodlands TX
Robert Jerry Hlozek - The Woodlands TX

Assignee:

Union Carbide Chemicals & Plastics Technology Corporation - Danbury CT

International Classification:

C09K 300

US Classification:

252184

Abstract:

Absorption solvents for removing mercaptans from gas streams are disclosed. The absorption solvents comprise an alkylether of a polyalkylene glycol, e. g. , methoxytriglycol, and a secondary monoalkanolamine, e. g. , N-methylethanolamine, as well as optionally other amines, e. g. , methyldiethanolamine and diethanolamine. The absorption solvents do not require the presence of iodine for removal of mercaptans. Absorption processes utilizing the solvents are also disclosed.

US Patent:

59106115, Jun 8, 1999

Filed:

May 24, 1995

Appl. No.:

8/449254

Inventors:

Richard Alan Gregory - Belle Mead NJ
Martin Frank Cohen - Yorktown Heights NY

Assignee:

Union Carbide Chemicals & Plastics Technology Corporation - Danbury CT

International Classification:

C07C20984
C07C20986

US Classification:

564497

Abstract:

Method which includes passing a gas stream containing carbon dioxide, hydrogen sulfide, sulfur dioxide, mercaptans and other acid gases through an aqueous alkanolamine solution to remove the carbon dioxide, hydrogen sulfide, sulfur dioxide, mercaptans, etc. , from the gaseous stream. Heat-stable alkanolamine salts form in the aqueous alkanolamine solution due to the acid contaminants (other than hydrogen sulfide or carbon dioxide) removed from the gas stream. A base is added to the aqueous alkanolamine solution to convert all or part of the heat-stable alkanolamine salts into alkanolamine and simple salts. The base-treated aqueous alkanolamine solution is electrodialyzed in an electrodialysis cell containing ion exchange membranes. The purified aqueous alkanolamine solution can be used again to remove carbon dioxide, etc. , from the gas stream.

US Patent:

55891497, Dec 31, 1996

Filed:

Jul 12, 1995

Appl. No.:

8/501702

Inventors:

Paul Garland - Aylesbury, GB
Craig N. Schubert - Belle Mead NJ
Richard A. Gregory - Belle Mead NJ
Eduardo Garcia-Rameau - Houston TX
Rickey Epps - Houston TX
David Burns - The Woodlands TX
Robert J. Hlozek - The Woodlands TX

Assignee:

Union Carbide Chemicals & Plastics Technology Corporation - Danbury CT

International Classification:

B01D 5348

US Classification:

4232424

Abstract:

Absorption solvents for removing mercaptans from gas streams are disclosed. The absorption solvents comprise an alkylether of a polyalkylene glycol, e. g. , methoxytriglycol, and a secondary monoalkanolamine, e. g. , N-methylethanolamine, as well as optionally other amines, e. g. , methyldiethanolamine and diethanolamine. The absorption solvents do not require the presence of iodine for removal of mercaptans. Absorption processes utilizing the solvents are also disclosed.