Patent · US Expired

Continuous process for the recovery of caprolactam

US4107160A · kind A · utility

25Cited by
5References
2Claims
0Family size

Assignee

Inventors

Key dates

Filing dateAug 24, 1977
Grant dateAug 15, 1978
Priority date—
Expiry dateAug 24, 1997

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC08J2377/02
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

A process for the continuous recovery of caprolactam from either solid polycaprolactam waste by depolymerization or from liquid polycaprolactam extraction water from an extraction zone where, in either instance, a caprolactam water vapor mixture is produced and subsequently upgraded in a distillation zone to provide a dilute mixture of caprolactam and water vapor. A minor portion of this dilute caprolactam water vapor is condensed and recycled to the distillation zone. The remaining, major portion of this mixture is compressed and admixed with fresh steam, superheated and passed to either the extraction zone or depolymerization reaction.

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