Patent · US Expired

Recovery of the formic acid/water azeotrope by distillation

US3983010A · kind A · utility

10Cited by

8References

3Claims

0Family size

Assignee

BASF SE

Inventors

Konrad Rauch
Hans Kiefer · Leopoldshafen, DE
Dieter Hesse · Munich, DE
Max Strohmeyer · Schifferstadt, DE
Heinz Hohenschutz · Mannheim, DE

Key dates

Filing date	Feb 6, 1975
Grant date	Sep 28, 1976
Priority date	—
Expiry date	Feb 6, 1995

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/44
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Formic acid is isolated from mixtures containing formic acid, methyl formate, methanol and water by fractional distillation, the mixture being fed into the upper half of the distillation column and 5 to 15 theoretical plates being maintained above the feed point and 10 to 25 theoretical plates below the feed point. The formic acid is withdrawn at the bottom end of the column as an azeotrope with water, the azeotrope being in the liquid state or preferably in the vapor state.

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