Patent · US Expired

Purification of formic acid by extractive distillation

US4076594A · kind A · utility

11Cited by

8References

4Claims

0Family size

Assignee

BASF SE

Inventors

Horst Buelow · Bischofswerda, DE
Heinz Hohenschutz · Mannheim, DE
Johannes E. Schmidt · Ludwigshafen, DE
Werner Sachsze

Key dates

Filing date	Oct 4, 1976
Grant date	Feb 28, 1978
Priority date	—
Expiry date	Oct 4, 1996

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/48
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Formic acid is purified by extractive distillation of its aqueous solutions using a basic extractant, followed by distillation of the bottom mixture first obtained, the extractant used being N-formylmorpholine.

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