Patent · US Expired

Preparation of caprolactam

US5874575A · kind A · utility

7Cited by

9References

23Claims

0Family size

Assignee

BASF SE

Inventors

Eberhard Fuchs · Bischofswerda, DE
Guenther Achhammer · Mannheim, DE

Key dates

Filing date	Oct 3, 1996
Grant date	Feb 23, 1999
Priority date	—
Expiry date	Oct 3, 2016

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S203/90
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

An improved process for the preparation of caprolactam by heating 6-aminocapronitrile in the presence of a heterogenous catalyst and water under superatmospheric pressure without rapid deactivation of the catalysts used. The process further includes the addition of a low or high boiling alcohol in the heating phase, after which the products are obtained by distillation. The process further includes a method of working up the top and bottom products of the reactors to achieve higher yields.

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