Patent · US Active

Process for preparation of high purity methacrylic acid

US8426637B2 · kind B2 · utility

5Cited by

7References

30Claims

0Family size

Assignee

Evonik Röhm GmbH · DE

Inventors

Martin Koestner · Darmstadt, DE
Gerhard Koelbl · Gernsheim, DE
Ralf Meier · Dortmund, DE

Key dates

Filing date	Nov 17, 2008
Grant date	Apr 23, 2013
Priority date	—
Expiry date	Aug 28, 2029

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/582
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The present invention relates to a process for preparation of pure methacrylic acid, at least comprising the process steps: a) gas phase oxidation of a C4 compound to obtain a methacrylic acid-comprising gas phase, b) condensation of the methacrylic acid-comprising gas phase to obtain an aqueous methacrylic acid solution, c) separation of at least a part of the methacrylic acid from the aqueous methacrylic acid solution to obtain at least one crude methacrylic acid-comprising product; d) separation of at least a part of the methacrylic acid from the at least one crude methacrylic acid-comprising product by means of a thermal separation process to obtain a pure methacrylic acid.

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