Patent · US Expired

Recovery of caprolactam from polycaprolactam

US5359062A · kind A · utility

18Cited by

1References

7Claims

0Family size

Assignee

BASF SE

Inventors

Hugo Fuchs · Ludwigshafen, DE
Gerald Neubauer · Weinheim, DE
Josef Ritz · Ludwigshafen, DE
Claus-Ulrich Priester · Ludwigshafen, DE

Key dates

Filing date	Apr 29, 1993
Grant date	Oct 25, 1994
Priority date	—
Expiry date	Apr 29, 2013

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D201/12
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Caprolactam is recovered from polycaprolactam by hydrolyric cleavage of polycaprolactam with from 5 to 50 parts by weight of water per part by weight of polycaprolactam at from 200.degree. to 350.degree. C. under superatmospheric pressure to give an aqueous solution or suspension which contains monomeric caprolactam and oligomers thereof and may contain polycaprolactam and subsequent isolation of monomeric caprolactam from the aqueous solution or suspension by distillation or extraction, by a process in which the hydrolyric cleavage is carried out in the presence of an alkali metal hydroxide at a pH of from 5 to 10.

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