Patent · US Expired

Method for obtaining pure n-vinyl pyrrolidone

US6703511B2 · kind B2 · utility

3Cited by

5References

8Claims

0Family size

Assignee

BASF SE

Inventors

Bernd Eck · Viernheim, DE
Jorg Heilek · Bammental, DE
Martin Schmidt-Radde · Beindersheim, DE
Herbert Helfert · Bischofswerda, DE

Key dates

Filing date	Nov 21, 2002
Grant date	Mar 9, 2004
Priority date	—
Expiry date	Nov 21, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D201/16
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention describes a process for the isolation of pure N-vinylpyrrolidone from N-vinylpyrrolidone-containing crude products, comprising a single-stage or multistage crystallization process, which comprises passing the mother liquor from the first crystallization stage either to a distillative and/or extractive purification, or returning it to an N-vinylpyrrolidone-containing product stream of the preparation process.

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