Patent · US Expired

Purification of pyrrolidone

US4276215A · kind A · utility

1Cited by
4References
8Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJul 25, 1977
Grant dateJun 30, 1981
Priority date—
Expiry dateJul 25, 1997

Classification

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

Abstract

2-Pyrrolidone is purified by contact with particulate calcium oxide for a sufficient time at elevated temperatures followed by distilling and condensing the purified 2-pyrrolidone.

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