Method for preparing 1,3-propylene glycol by directly hydrogenizing glycerol

A technology of propylene glycol and glycerol, applied in chemical instruments and methods, preparation of hydroxyl elimination, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of low selectivity, low production efficiency, low economy, etc. The effect of increasing conversion rates
CN101723801AActive Publication Date: 2010-06-09DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Publication Date
2010-06-09

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Abstract

The invention relates to a method for preparing 1,3-propylene glycol by directly hydrogenizing glycerol. A reaction system comprises glycerol, hydrogen, catalyzer and two or more of dissolvants. In the reaction system, the weight ratio of the dissolvants to the glycerol is 0.2-9.8:1, and the weight ratio of the catalyzer to the glycerol is 0.2-2:1; the reaction conditions are shown as follows: the reaction temperature is 80-300 DEC G, the hydrogen pressure is 0.1-18.0MPa, and the contact time of the glycerol and the catalyzer in the reaction process is 0.3-50h; the catalyzer contains a carrier and active components carried on the carrier, wherein the carrier is ZrO2, SiO2-Al2O3 or Al2O3, and the active components are one or more of Ru, Pt, Pd and Rh. The invention can obviously increase the selectivity of generating 1,3-propylene glycol by hydrogenizing glycerol or increase the percent conversion of glycerol and reduce the generation of the byproduct of 1,2-propylene.
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Description

technical field

[0001] The invention relates to a process for directly preparing 1,3-propanediol through hydrogenation of glycerin. technical background

[0002] 1,3-propanediol is an important raw material for the production of polytrimethylene terephthalate. The existing 1,3-propanediol preparation technologies include acrolein hydration hydrogenation method, ethylene oxide carbonylation hydrogenation method, microbial fermentation method and glycerin direct hydrogenation method.

[0003] Chinese patent CN96198050.8 discloses a technology for producing 1,3-propanediol by carbonylation and hydrogenation of ethylene oxide, in which ethylene oxide and synthesis gas are reacted in the presence of a catalyst to generate 3-hydroxypropionaldehyde, 3- Hydroxypropionaldehyde reacts with hydrogen in the presence of a catalyst to produce 1,3-propanediol.

[0004] Chinese patent CN93114516.3 discloses a technique for preparing 1,3-propanediol by dehydration of glycerin through acrol...

Claims

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