Method for producing 1,6-hexanediol by hydrogenation of oligo- and polyesters

摘要

The present invention relates to a process for hydrogenating oligo- and/or polyesters obtainable by esterifying a DCS with a diol or diol mixture, said hydrogenation being performed in the presence of a catalyst whose catalyst precursor comprises copper oxide, aluminum oxide and at least one oxide of lanthanum, of iron, of tungsten, of molybdenum, of titanium or of zirconium, and to a process for preparing 1,6-hexanediol by catalytically hydrogenating ester mixtures which comprise, as main components, oligo- and polyesters of adipic acid and 6-hydroxycaproic acid, and are obtained by esterifying DCS with diols, especially 1,6-hexanediol or diol mixtures.

主权项

1. A process for hydrogenating at least one oligo- or polyester comprising:
hydrogenating the at least one oligo- or polyester in the presence of a shaped catalyst body whose precursor is obtained by a process comprising: (i) combining
an oxidic material comprising copper oxide, aluminum oxide and at least one additional metal oxide of a metal selected from the group consisting of lanthanum, tungsten, molybdenum, titanium, zirconium, and iron, and at least one second material selected from the group consisting of pulverulent metallic copper, copper flakes, pulverulent cement, graphite, and a mixture thereof with the oxidic material to obtain a catalyst precursor mixture, (ii) shaping the catalyst precursor mixture to obtain the shaped catalyst body, and (iii) calcining the shaped catalyst body wherein the oxidic material is obtained by simultaneous or successive precipitation of an active copper component, an aluminum component, and a component of at least one of oxide of a metal selected from the group consisting of lanthanum, tungsten, molybdenum, titanium, and zirconium, subsequent drying and a first calcination and wherein the at least one oligo- or polyester is obtained by esterifying a dicarboxylic acid solution with a diol or diol mixture, then adding a base selected from the group consisting of lithium alkoxide, potassium alkoxide, and sodium alkoxide, wherein the dicarboxylic acid solution comprises dicarboxylic acids obtained as a waste product in the oxidation of cyclohexane with air to give cyclohexanone and cyclohexanol, by extraction of the oxidized mixture with water.