Process for producing methacrylic acid or methacrylic acid esters
AssigneeRohm Co., Ltd.
InventorsAlexander May, Steffen Krill, Marcel Treskow, Diego Carambia, Gabriel Avella
Life of this patent
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Abstract
A process can be used for producing methacrylic acid or a methacrylic acid ester. The process involves producing acrolein, reacting the produced acrolein with hydrogen to produce propanal, reacting the propanal with formaldehyde to produce methacrolein, and oxidizing the methacrolein in the presence of an oxygen containing gas and optionally an alcohol, to obtain methacrylic acid or methacrylic acid ester.
Claims19
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).
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, and
- 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,
- wherein acrylic acid, which is formed in a) as a byproduct and/or propionic acid, which is formed in b) from hydrogenation of the acrylic acid in step b) reacts as a co-catalyst in c).
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, and
- 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,
- wherein a) and b) are carried out simultaneously in one reactor.
Dependencies are inferred from the claim text.