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US 6,297,408 B1Granted
Two-stage process for the production of 1,3-propanediol by catalytic hydrogenation of 3-hydroxypropanal
AssigneeE. I. Du Pont de Nemours and Company
InventorsThomas Haas, Bernd Jaeger, Joerg Sauer, Willi Hofen, Rudolf Vanheertum
Life of this patent
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Abstract
A two-stage process for producing 1,3-propanediol by first hydrogenating at a temperature of 30° C. to 80° C. in the presence of an oxide-supported metal hydrogenation catalyst. Second, the resulting reaction solution is hydrogenated at a temperature of 80° C. to 180° C. to a 3-hydroxypropanal conversion of substantially 100% in the presence of an activated carbon-supported metal hydrogenation catalyst.
Claims10
A process for the production of 1,3-propanediol by catalytically hydrogenating an aqueous solution of 3-hydroxypropanal comprising the steps of:
- passing the 3-hydroxypropanal solution to a first hydrogenation stage and hydrogenating at a temperature of 30° C. to 80° C. to a 3-hydroxypropanal conversion of at least 70% in the presence of a first hydrogenation catalyst, the first hydrogenation catalyst comprising a first metal supported on an oxide phase;
- and
- passing the reaction solution obtained from the first hydrogenation stage to a second hydrogenation stage and hydrogenating at a temperature of about 80° C. to 180° C. to a 3-hydroxypropanal conversion of up to 100% in the presence of a second hydrogenation catalyst comprising a second metal on an activated carbon support, where the hydrogenation temperature of the second stage is greater than the hydrogenation temperature of the first stage.
Dependencies are inferred from the claim text.