Process for the production of ethanol

Details Process for the production of ethanol Process for the production of ethanol

C - Chemistry, Metallurgy

07

C

260/639, 260/637

C07C 31/08 (2006.01) C07C 29/149 (2006.01) C07C 51/12 (2006.01)

Patent

CA 1233484

-35- ABSTRACT Ethanol is produced by carbonylation of methanol by reaction with carbon monoxide in the presence of a carbonylation catalyst to form acetic acid which is then converted to an acetate ester followed by hydrogenolysis of the acetate ester formed to give ethanol or a mixture of ethanol and another alcohol which can be separated by distillation. Preferably the other alcohol or part of the ethanol recovered from the hydrogenolysis step is recycled for further esterification. Carbonylation can be effected- using a CO/H2 mixture and hydrogenolysis can similarly be conducted in the presence of carbon monoxide, leading to the possibility of circulating gas between the carbonylation and hydrogenolysis zones with synthesis gas, preferably a 2:1 H2:CO molar mixture being used as make up gas.

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