Patent · US Expired

(Meth)acrylic acid crystal and process for producing aqueous (meth)acrylic acid

US7557245B2 · kind B2 · utility

23Cited by

13References

8Claims

0Family size

Assignee

Evonik Stockhausen GmbH · US

Inventors

Stefan Nordhoff · Recklinghausen, DE
Torsten Balduf · Pfungstadt, DE
Gunther Bub · Marl, DE
Roland Fornika · Dülmen, DE
Jurgen Mosler · Marl, DE
Thomas Rathke · Bluffton, US
Axel Kobus · Langen, DE
Dennis Thong · Singapore, SG

Key dates

Filing date	Mar 17, 2003
Grant date	Jul 7, 2009
Priority date	—
Expiry date	Sep 6, 2024

Classification

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

Abstract

The present invention relates to processes for purifying a composition containing (meth)acrylic acid, at least one impurity and water, wherein the composition has a water content in the range of 0.55 to 90, based on the composition, to form a purified phase containing (meth)acrylic acid and at least one impurity, wherein, in the purified phase, the quantity of at least one impurity is less than 7% by weight, based on (meth)acrylic acid in the purified phase.

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