Patent · US Expired

Process for the extraction of carboxylic acids from dilute aqueous solutions

US4720577A · kind A · utility

7Cited by

0References

10Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Bernhard Wojtech · Bad Soden am Taunus, DE
Walter Steppich · Wiesbaden, DE
Dieter Freudenberger · Hofheim, DE
Knut Riedel · Hofheim, DE

Key dates

Filing date	Oct 2, 1985
Grant date	Jan 19, 1988
Priority date	—
Expiry date	Oct 2, 2005

Classification

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

Abstract

The invention relates to a process for the extraction of carboxylic acids from aqueous solutions with a carboxylic acid content below 8% by weight. A mixture of an aliphatic amine with a total carbon number of at least 10 and a phenol or naphthol is used as extracting agent. The molar ratio of phenol:amine or alkylated phenol:amine or naphthol:amine is in the range from 0.1:1 to around 1.1:1.

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