Russell Scott Gibbs

US Patent:

52024814, Apr 13, 1993

Filed:

Mar 5, 1992

Appl. No.:

7/845368

Inventors:

Mark O. Scates - Pearland TX
Russell K. Gibbs - Houston TX
G. Paull Torrence - Corpus Christi TX

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C07C 5110
C07C 5114

US Classification:

562608

Abstract:

Acetic acid produced by the low water carbonylation of methanol and containing iodide, unsaturates and carbonyl impurities is purified by treatment with ozone.

US Patent:

52064344, Apr 27, 1993

Filed:

Nov 19, 1990

Appl. No.:

7/615939

Inventors:

Mark O. Scates - Pearland TX
Russell K. Gibbs - Houston TX
G. Paull Torrence - Corpus Christi TX

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C07C 6727
C07C 6748

US Classification:

562891

Abstract:

Esters such as methyl acetate which contain carbonyl impurities including aldehydes are purified by adding to the esters an amino compound which reacts with the carbonyls to form water soluble nitrogenous derivatives, separating an organic ester phase from an aqueous derivative phase, and distilling the ester phase to further remove heavier impurities. The formation of nitrile from the nitrogenous derivative is minimized by adding water to the distillation column or washing the aqueous bottoms from distillation with water to further remove the derivatives from any ester contained in the bottoms. The organic phase recovered from the bottoms can be recycled to the distillation to recover ester.

US Patent:

51552663, Oct 13, 1992

Filed:

Apr 19, 1991

Appl. No.:

7/687099

Inventors:

Mark O. Scates - Pearland TX
Russell K. Gibbs - Houston TX
G. Paull Torrence - Corpus Christi TX

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C07C 5147
C07C 51487
C07C 5150
C07C 5308

US Classification:

562608

Abstract:

Acetic acid containing iodide, unsaturates and carbonyl impurities is purified by treatment with ozone in the presence of an oxidation catalyst. The acetic acid product may be further contacted with activated carbon or ion-exchange resins for additional removal of impurities.

US Patent:

55999760, Feb 4, 1997

Filed:

Apr 7, 1995

Appl. No.:

8/418333

Inventors:

Mark O. Scates - Friendswood TX
Steven E. Parker - Seabrook TX
Jennifer B. Lacy - Houston TX
Russell K. Gibbs - Houston TX

Assignee:

Hoechst Celanese Corporation - Sommervile NJ

International Classification:

C07C 5112

US Classification:

562519

Abstract:

A method is provided to improve the quality of recycle of certain residues by modifying the separation of alkanes and alkane-like materials and carbonyl-containing impurities from the recycle during the manufacture of acetic acid by the carbonylation of methanol. The improvement comprises partitioning the residues by the addition of water obtained from aqueous streams containing up to 50 wt. % acetic acid and which have been treated in a catalytic distillation unit to react the acetic acid with methanol to form recyclable methyl acetate and water and wherein the water is separated from the organics by distillation.

US Patent:

51552655, Oct 13, 1992

Filed:

Apr 19, 1991

Appl. No.:

7/687098

Inventors:

Mark O. Scates - Pearland TX
Russell K. Gibbs - Houston TX
G. Paull Torrence - Corpus Christi TX

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C07C 5147
C07C 51487
C07C 5150
C07C 5308

US Classification:

562608

Abstract:

Acetic acid containing iodide, unsaturates and carbonyl impurities is purified by treatment with ozone and thereafter contacted with activated carbon and/or an ion-exchange resin for removal of impurities.