Patent · US Expired

Method of purifying and producing acrylic acid or methacrylic acid

US6700016B1 · kind B1 · utility

6Cited by

1References

21Claims

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	Dec 6, 2001
Grant date	Mar 2, 2004
Priority date	—
Expiry date	Dec 6, 2021

Classification

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

Abstract

Acrylic acid or methacrylic acid is purified be crystallization to obtain crystals and a mother liquor, by a process in which the crystals are washed with a was 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.