Process for the purification of epsilon-caprolactam

US4148793A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Harry Danziger · London, GB
• Ludwig Deibele · Neunburg vorm Wald, DE
• Bernd-Ulrich Kaiser

Key dates

• Filing date: Sep 9, 1977
• Grant date: Apr 10, 1979
• Expiry date: Sep 9, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D201/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the removal of residues of solvent from crystallized .epsilon.-caprolactam, wherein the major quantity of solvent is removed in a first stage by distillation in the presence of water in an amount so that the water content of the residue of the first stage is from 0.5 to 6% by weight, and in a second stage by distilling water and any residues of solvent still present.