Patent · US Expired

Process for the purification and preparation of acrylic acid or methacrylic acid

US6921837B2 · kind B2 · utility

3Cited by

4References

19Claims

0Family size

Assignee

BASF SE

Inventors

Bernd Eck · Viernheim, DE
Jorg Heilek · Bammental, DE
Dieter Baumann · Greven, DE
Volker Schliephake · Schifferstadt, DE

Key dates

Filing date	Sep 8, 2003
Grant date	Jul 26, 2005
Priority date	—
Expiry date	Sep 8, 2023

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/47
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Acrylic acid or methacrylic acid is purified by crystallization to obtain crystals and a mother liquor, by a process in which the crystals are washed with a wash liquid containing the acid and having a temperature from 15 to 40° C. Furthermore, a process for the preparation of acrylic acid or methacrylic acid comprises the abovementioned purification process.

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