VERFAHREN ZUR HERSTELLUNG VON VORWIEGEND ALS TRANS-ISOMERE VORHANDENEM CYCLOHEXANDIMETHANOL

摘要

The prodn. is of cyclohexanedimethanol (I) of trans:cis isomer ratio greater than about 1:1 by the hydrogenation of a dialkylcyclohexanedicarboxylate (II) (where alkyl is 1-4C) of trans:cis isomer ratio less than about 1:1. The process comprises: (a) providing a hydrogenation zone contg. a granular heterogenous ester hydrogenation catalyst (HC) which contains Cu or a Gp. VIII metal; (b) supplying to the zone a vaporous feed stream contg. H2 and a hydrogenatable material comprising (II) at an inlet temp. above the dew point of the mixt.; (c) maintaining the zone at 150-350 deg C and 150-2000 psia (about 10.34-137.9 bar); (d) passing the feed stream through the zone; and (e) recovering from the zone the desired (I) with the specified trans:cis isomer ratio.