| abstract |
In the process for the removal of acetone from reaction mixtures which, in the reaction of methyl acetate and / or dimethyl ether with carbon monoxide and optionally hydrogen to acetic anhydride and optionally ethylidene diacetate in the presence of one of carbonyl complexes of noble metals of group VIII of the periodic table, acetic acid, an organophosphorus or organo nitrogen compound, Methyl iodide in a molar ratio of 1: (25 - 600): (10 - 300): (10 - 300) and optionally compounds of carbonyl-forming base metals existing catalyst system were obtained, the acetone obtained as a by-product during the reaction is condensed at temperatures of 50 to 250 ° C. , Pressures from 0.01 to 150 bar and a molar ratio of 1: (25 - 500): (10 - 100): (15 - 150) as defined above predominantly to higher-boiling secondary products, these are distilled together with the volatile constituents of the reaction mixture from the non-volatile components of the catalyst system s and separates the distillate in a subsequent distillation zone into a low boiling mixture consisting of methyl iodide, unreacted methyl acetate and / or dimethyl ether and residual acetone and a bottom product consisting of acetic acid, acetic anhydride, optionally ethylidene diacetate and the acetone derivatives. |