PROCESS FOR THE PURIFICATION AND RECOVERY OF CONTAMINATED SOLUTION OF A CATALYST FROM THE CARBONYLATION OF METHANOL AND/OR METHYL ACETATE AND/OR DIMETHYL ETHER

摘要

The present invention describes a process which makes it possible to purify the catalyst solution the used in, carbonylation of methanol and/or methyl acetate and/or dimethyl ether and contaminated in the course of the process, by extraction with trialkylphosphane, in which the undistillable organic impurities are removed from the catalyst solution without loss of rhodium and without destruction of the rhodium carbonyl complex and of the promoter. Rhodium complex and promoter can be returned to the carbonylation process again without any additional measures. Recycling of the trialkylphosphane extractant used for work-up avoids pollution of the environment due to waste products.