Patent · US Expired

Recovery of monomeric acrylic acid from residues originating from processed crude acrylic acid

US3954854A · kind A · utility

24Cited by

3References

4Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Klaus Gehrmann · Lechenich, DE
Heinz Erpenbach · Cologne, DE
Georg Kohl · Hürth, DE
Hans Klaus Kuebbeler

Key dates

Filing date	Feb 12, 1975
Grant date	May 4, 1976
Priority date	—
Expiry date	Feb 12, 1995

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/487
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Monomeric acrylic acid is recovered from residues originating from processed crude acrylic acid and containing .beta.-acryloyloxypropionic acid, .beta.-acetoxypropionic acid, hydracrylic acid, dihydracrylic acid and polymeric hydracrylic acid. To this end, the residues are heated to temperatures within the range 130.degree. and 250.degree.C under pressures within the range 0.01 and 1 atmosphere absolute in contact with catalysts selected from alkali metal or alkaline earth metal carboxylates, phosphates or borates, or from alkali metal or alkaline earth metal compounds producing carboxylates together with the carboxylic acids being contained in the residues.

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