FIELD: chemistry.
SUBSTANCE: description is given of a method of selective removal of catalytic group VIII metals and carbonylation promoter metals from liquid compositions, containing carbonylation product, catalytic group VIII metals and carbonylation promoter metals, corrosion metals and optionally alkali or alkali-earth metals. The method involves bringing the said liquid composition into contact with a chelating resin to remove at least part of the iridium as a carbonylation catalyst and promoter metal contained in the liquid composition and wherein the chelating resin contains at least one thiourea functional group. The method is suitable for treating process streams obtained in the production of carboxylic acids and/or carboxylic acid anhydrides.
EFFECT: removal of catalytic metals and promoter metals mainly before corrosion metals from carbonylation process streams.
24 cl, 2 ex, 2 tbl
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