Purification of N-(2-hydroxyethyl)-2-pyrrolidone

US7238260B2 · kind B2 · utility

Assignee

• Lyondell Chemical Technology, L.P. · US

Inventors

• Andrew P. Kahn · Eagleville, US
• David W. Leyshon · West Chester, US
• Shaw-Chan Lin · West Chester, US
• Edward Patrick Carey · Atglen, US

Key dates

• Filing date: Oct 26, 2004
• Grant date: Jul 3, 2007
• Expiry date: Mar 4, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

N-(2-hydroxyethyl)-2-pyrrolidone (HEP) is purified by a distillation sequence in which the purified HEP is recovered as a side stream without being separated as an overhead at any point in the procedure.