Patent · US Expired

Method for the purification of a crude acrylic acid melt

US7112695B2 · kind B2 · utility

16Cited by

0References

47Claims

0Family size

Assignee

BASF SE

Inventors

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

Key dates

Filing date	Apr 4, 2001
Grant date	Sep 26, 2006
Priority date	—
Expiry date	Apr 4, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/47
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

In a process for the purification of a crude acrylic acid melt, the crude acrylic acid melt is converted, under the action of low temperatures, into a crude acrylic acid suspension consisting of acrylic acid crystals and residual melt, and the acrylic acid crystals of the crude acrylic acid suspension are freed from remaining residual melt in a wash column, the production of the acrylic acid crystals of the crude acrylic acid suspension being carried out in the presence of water, the wash column being a wash column with forced transport of the acrylic acid crystals and the wash liquid used being the melt of acrylic acid crystals purified in the wash column.

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