Patent · US Expired

Preparation of caprolactam

US4730040A · kind A · utility

31Cited by

1References

9Claims

0Family size

Assignee

BASF SE

Inventors

Uwe Vagt · Speyer, DE
Rolf Fischer · Heidelberg, DE
Franz Merger · Bischofswerda, DE
Hans-Martin Hutmacher · Ludwigshafen, DE

Key dates

Filing date	Jan 28, 1987
Grant date	Mar 8, 1988
Priority date	—
Expiry date	Jan 28, 2007

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D201/08
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

.epsilon.-caprolactam is prepared by a process in which PA1 (a) a 5-formylvalerate is reacted with water in the presence of an acidic agent at from 30.degree. to 200.degree. C., PA1 (b) the 5-formylvaleric acid thus obtained is reacted with excess ammonia and hydrogen in the presence of a hydrogenation catalyst and of a solvent which is inert under the reaction conditions, at from 50.degree. to 150.degree. C. under superatmospheric pressure, and PA1 (c) after the ammonia has been separated off, the resulting solution of 6-aminocaproic acid is heated to 150.degree.-370.degree. C. and the caprolactam formed is isolated.

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