Separation of tars from carbonylation reaction mixtures

Details Separation of tars from carbonylation reaction mixtures Separation of tars from carbonylation reaction mixtures

C - Chemistry, Metallurgy

07

C

260/496.6, 260/5

C07C 53/12 (2006.01) B01J 31/40 (2006.01) C07C 51/47 (2006.01) C07C 51/573 (2006.01) C07C 69/16 (2006.01)

Patent

CA 1171879

ABSTRACT OF THE DISCLOSURE Tarry residues often are formed in carbonylation reac- tions, such as those in which esters or ethers are carbonylated to produce ethylidene diacetate or carboxylic acid anhydrides, such as acetic anhydride Such residues contain Group VIII noble metal catalysts, typically rhodium, which must be separated before the residues can be disposed of. In the process of the invention, the residues are extracted with solvents which preferentially dissolve the tars. Preferred solvents include alkanes, cycloalkanes, halogenated alkanes, and aromatic hydrocarbons, particularly cyclohexane, car?? tetrachloride, and toluene Separation of the residues from the noble metal catalyst by solvent extraction makes possible the disposal of the residues and the return of the noble metals to the reaction for reuse.

401806

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