Patent ID: 11905239
Assignee: RÖHM GMBH
Field: Organic fine chemistry (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A process for producing methacrylic acid or a methacrylic acid ester, the process comprising:
a) producing acrolein from a raw material comprising propylene,
b) reacting the acrolein of a) with hydrogen to produce propanal,
c) reacting the propanal of b) with formaldehyde to produce methacrolein,
d) oxidizing the methacrolein in the presence of an oxygen containing gas and optionally an alcohol, to the methacrylic acid or the methacrylic acid ester, and
wherein the acrolein of a) is hydrogenated in the presence of acrylic acid, which is formed in a) as a byproduct, and wherein the acrylic acid is hydrogenated to propionic acid in b).