Process for separating iodine and its compounds from the...

Details Process for separating iodine and its compounds from the... Process for separating iodine and its compounds from the...

C - Chemistry, Metallurgy

07

C

260/496.6, 260/5

C07C 53/08 (2006.01) C07C 51/44 (2006.01) C07C 51/487 (2006.01) C07C 53/12 (2006.01) C07C 69/16 (2006.01)

Patent

CA 1234148

PROCESS FOR SEPARATING IODINE AND ITS COMPOUNDS FROM THE CAR- BONYLATION PRODUCTS OBTAINED BY SUBJECTING DIMETHYLETHER, METHYL ACETATE OR METHANOL TO A CARBONYLATION REACTION ABSTRACT OF THE DISCLOSURE The disclosure relates to a process for separating iodine and its compounds from the carbonylation products acetic acid, acetic anhydride or ethylidene diacetate obtained by subject- ing dimethylether, methyl acetate or methanol to a carbonyla- tion reaction. For reducing the quantity of total iodine can- taminating the carbonylation products to less than 20 ppb iodine, the disclosure provides for the carbonylation products to be treated at temperatures of 20 to 250°C with an alkyl or aryl phosphine or a heterocyclic aromatic nitrogen compound and at least one of the metals copper, silver, zinc or cadmium or their compounds and to be distillatively separated from the iodine thereby fixed in non-volatile form.

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