Patent · US Expired

Process for the manufacture of very pure .epsilon.-caprolactone

US4313879A · kind A · utility

4Cited by

4References

9Claims

0Family size

Assignees

DEGUSA AG · DE
BAYER HEALTHCARE LLC · DE

Inventors

Herbert Klenk · Hanau, DE
Rolf Wirthwein · Hanau, DE
Gerd Siekmann · Cologne, DE
Wulf Schwerdtel

Key dates

Filing date	Aug 20, 1980
Grant date	Feb 2, 1982
Priority date	—
Expiry date	Aug 20, 2000

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D315/00
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a process for the production of .epsilon.-caprolactone having a purity of 99.9% and increased color and storage stability which comprises feeding .epsilon.-caprolactone, which has been made by reacting cyclohexanone with a solution of a percarboxylic acid, into a first distillation unit, operating at 0.1 to 500 mbars and drawing off as the top product a mixture consisting of .epsilon.-caprolactone and lower-boiling impurities, feeding the bottom product of said first distillation unit into a second distillation unit, operating at 0.1 to 500 mbars and then drawing off the pure .epsilon.-caprolactone as the top product. The .epsilon.-caprolactone is useful as an intermediate for the production of known useful compounds such as polyesterols which are subsequently converted to polyurethanes.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.