Joseph Francis Englert

US Patent:

52371140, Aug 17, 1993

Filed:

Jul 30, 1992

Appl. No.:

7/920689

Inventors:

Joseph F. Englert - La Place LA
Willie Harrison - New Orleans LA

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C07C 1734
C07C 2121

US Classification:

570228

Abstract:

Quaternary ammonium phase transfer catalyst is removed from the dehydrochlorination product of 3,4-dichlorobutene-1 by treatment of the organic, chloroprene-containing phase with an oxy acid which combines with the catalyst to form a separate phase.

US Patent:

46058001, Aug 12, 1986

Filed:

Jan 17, 1983

Appl. No.:

6/458554

Inventors:

Joseph F. Englert - La Place LA
Louis J. Maurin - Wilmington DE
Clare A. Stewart - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C07C 1734

US Classification:

570228

Abstract:

An improved process for the catalytic dehydrochlorination of 3,4-dichlorobutene-1 with aqueous alkali, wherein the effluent from the dehydrochlorination reactor is separated into phases, and the organic phase is steam-stripped at low temperature (below about 80. degree. C. ) to recover chloroprene product, while the steam stripper heels are returned to the dehydrochlorination reactor. A small portion of the heels are purged prior to being recycled. Most of the catalyst is recovered and returned to the reaction, but a small amount of make-up catalyst is added. Chloroprene made in this process is a valuable monomer which finds use in the manufacture of a broad line of synthetic elastomers of considerable industrial interest.