| 摘要 |
HOE 90/H 030 Process for the simultaneous preparation of acetic acid and acetic anhydride of the disclosure A process is indicated for the simultaneous preparation of acetic acid and acetic anhydride by reacting a starting mixture of methanol and methyl acetate and, if desired, dimethyl ether with carbon monoxide in a reaction zone on a catalyst system under anhydrous conditions, which comprises a) working in the presence of a catalyst system comprising a non-noble metal from Group VIII of the Periodic Table, methyl iodide, an alkali metal compound, organophosphonium compound or organoammonium compound as promoter and, if desired, a compound of a non noble metal from Groups IV to VII of the Periodic Table as copromoter; b) employing a molar ratio between methanol and methyl acetate and, if used, dimethyl ether of from 10 : 1 to 1 : 10 as the starting mixture, and c) carrying out the reaction under a pressure of from 25 to 200 bar and at a temperature of from 150 to 250.degree.C.
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