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METHOD FOR SELECTIVELY SEPARATING TARROW PRODUCTS FORMED IN CARBONYLATION REACTIONS CARBONYLIZED BY PRECIOUS METAL
METHOD FOR SELECTIVELY SEPARATING TARROW PRODUCTS FORMED IN CARBONYLATION REACTIONS CARBONYLIZED BY PRECIOUS METAL
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机译:贵金属碳酰化反应中目标产物的选择性分离方法
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摘要
Tarry residues often are formed in carbonylation reactions, 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, a portion of the carbonylation reaction mixture is flashed to a lower pressure and the resulting residues-containing liquid is extracted with solvents which preferentially remove the tars. The tars are separated from the solvents and disposed of while the solvents are recycled for further use. The catalyst-containing liquid is processed to remove residual solvent and returned to the carbonylation reaction.
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