Patent · US Active

Optimized process for preparing methacrylic acid

US10125077B2 · kind B2 · utility

4Cited by

2References

15Claims

0Family size

Assignee

Evonik Röhm GmbH · DE

Inventors

Steffen Krill · Mühltal, DE
Rudolf Burghardt · Darmstadt, DE
Melanie Raczek · Darmstadt, DE
Torsten Balduf · Pfungstadt, DE

Key dates

Filing date	Nov 16, 2015
Grant date	Nov 13, 2018
Priority date	—
Expiry date	Nov 16, 2035

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C47/22
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The present invention relates to an optimized process for preparing methacrylic acid, wherein methacrolein is prepared in a first stage from propionaldehyde and formaldehyde by means of a Mannich reaction and oxidized in a second stage to methacrylic acid. More particularly, the present invention relates to the reduction in the amounts of catalyst to be used in the first stage, especially to the reduction in the amounts of acid to be used here, by virtue of the additional installation of recycling streams suitable for the purpose.

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