FIELD: chemical technology.
SUBSTANCE: invention relates to continuous method for production of acetic acid and/or methyl acetate based on known process of methanol or derivatives thereof (such as dimethyl ether, halogenated methyl or methyl acetate) carbonylation. Process is carried out in homogenous liquid phase under carbon monoxide pressure in presence of catalytic system containing rhodium-based homogeneous catalyst and halogenated promoter, in presence of water in reaction medium and in amount of not less than 14 mass %. In continuous process homogeneous catalyst composition is gradually changed by continuous or discontinuous addition of any iridium compound. Catalyst composition is transformed without process shutdown by transition from rhodium-based catalyst to rhodium/iridium-based catalyst or iridium-based catalyst. Iridium addition makes it possible to decrease water content in reaction system.
EFFECT: modified industrial process of methanol carbonylation by transformation of catalytic system.
19 cl, 7 tbl
Authors
Dates
2006-04-27—Published
2002-02-05—Filed