| abstract |
Bsim process for the purification and recovery of the contaminated catalyst solution resulting from the carbonylation of methyl acetate and / or dimethyl ether, the carbonyl complexes of noble metals from group VIII of the Periodic Table of the Elements, quaternary heterocyclic aromatic nitrogen compounds or quaternary organophosphorus compounds as organic promoters, optionally compounds of carbonyl-forming non- Contains noble metals as inorganic promoters, undistillable organic impurities as well as acetic acid, acetic anhydride and ethylidene diacetate, the volatile constituents are distilled off from the catalyst solution, the remaining solid distillation residue is freed from the organic impurities by extraction with aliphatic ethers and the undissolved mixture of noble metal carbon is filtered Complex, organic and possibly inorganic promoters, dries it and leads it back into the carbonylation reaction. |