Patent · US Expired

Method for discontinuous purification of crude acrylic acid by means of crystallization

US7307189B2 · kind B2 · utility

2Cited by

4References

7Claims

0Family size

Assignee

BASF SE

Inventors

Bernd Eck · Viernheim, DE
Dieter Baumann · Greven, DE
Joerg Heilek · Bammental, DE
Klaus Joachim Mueller-Engel · Blankenloch, DE

Key dates

Filing date	May 16, 2001
Grant date	Dec 11, 2007
Priority date	—
Expiry date	Nov 13, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/43
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Crude acrylic acid is purified batchwise by crystallization by a process which comprises at least one purification stage and at least one stripping stage and in which at least the first stripping stage is carried out in a different crystallizer from the first purification stage.

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