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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

Active Publication Date: 2010-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

Since the product is an aqueous solution with a very low concentration, the production efficiency is low
[0008] Literature (Catalysis Communication 9 (2008) 1360-1363) reported a new method for the direct preparation of 1,3-propanediol by hydrogenation of glycerol, using 1,3-dimethyl-2-imidazolidinone as a solvent, by making 1,3 -Propylene glycol and hydrogen contact with a specific catalyst and remove a hydroxyl group to obtain 1,3-propanediol, but the by-product 1,2-propanediol is more, and the selectivity of the target product 1,3-propanediol is low, making the process economical lower

Method used

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

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Embodiment 1

[0022] The catalyst used is Pt / WO 3 / ZrO 2 . Catalyst weight composition is: Pt%=2%, WO 3 %=20%, the rest is carrier ZrO 2 . Carrier ZrO 2 It is prepared by precipitation method, and the catalyst active component Pt and auxiliary agent WO are prepared by conventional impregnation method. 3 Loaded on the prepared carrier ZrO 2 superior. The catalyst is activated by hydrogen before the reaction. The activation conditions are: temperature 400°C, hydrogen pressure 0.1MPa, hydrogen space velocity 1000h - , The activation time is 2h. A slurry bed reactor is selected, the solvent is 1,3-dimethyl-2-imidazolidinone, the weight ratio of the solvent to glycerin in the reaction system is 9:1, and the weight ratio of the catalyst to glycerol is 1:1. The reaction temperature is 170°C, the hydrogen pressure is 5.5Mpa, and the reaction time is 4h.

Embodiment 2

[0024] The solvent used is ethanol, and other conditions are the same as in Example 1.

Embodiment 3

[0026] The solvent used is water, and other conditions are the same as in Example 1.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/60B01J23/64B01J23/60
Inventor 吕元丁云杰龚磊峰马立新
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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