| 摘要 |
Prodn. of cyclohexanedimethanol by hydrogenation of dialkyl-cyclohexane dicarboxylate comprises (a) providing a hydrogenation zone contg. a granular reduced manganese promoted copper catalyst; (b) forming a vapour stream of a hydrogenatable material comprising a dialkyl cyclohexane dicarboxylate and 0.1-15 wt.% of acidic material, at temp. of 150-350 deg C above the dew pt. of the feed stream and at feed pressure of 150-2000 psia, the mixt. having a known hydrogen-contg. gas:dialkyl cyclohexane dicarboxylate ratio; (c) supplying the vapour stream to the hydrogenation zone; (d) maintaining hydrogenation conditions so as to keep the mixt. in contact with the catalyst above its dew pt.; (e) passing the stream through the hydrogenation zone; and (f) recovering from the hydrogenation zone a product stream of cyclohexanedimethanol. The dialkyl cyclohexane dicarboxylate is selected from di(1-4C alkyl) cyclohexane dicarboxylate. |
