VERFAHREN ZUR HERSTELLUNG VON VORWIEGEND ALS TRANS-ISOMERE VORHANDENEM CYCLOHEXANDIMETHANOL

摘要

Prepn. of cyclohexane dimethanol by hydrogenation of dialkyl cyclohexane dicarboxylate comprises (a) supplying a vaporous feed stream (A) to a hydrogenation zone contg. a heterogeneous ester hydrogenation catalyst (B), (b) maintaining a temp. of 150-350 deg C and a pressure of 150-2000 psia., (c) passing (A) through the hydrogenation zone, and (d) recovering a prod. stream of cyclohexane dimethanol. (A) cconsists of a H2-contg. gas and dialkyl cyclohexane dicarboxylate with known ratio. (B) is selected from Cu-contg. catalysts and Gp.VIII metal-contg. catalysts. The feed temp. is above the dew pt. of the feed stream. The dialkyl cyclohexane dicarboxylate is selected from di(1-4C alkyl) cyclohexane dicarboxylates. Also claimed is the following: prepn. of 1,4-cyclohexane dimethanol by hydrogenation of dimethyl 1,4-cyclohexane dicarboxylate (see CLAIMED PROCESS).