Method for producing 1-propylene glycol with 3-hydracrylic acid methyl ester

A technology of methyl hydroxypropionate and propylene glycol, which is applied in the preparation of oxygen-containing compounds, chemical instruments and methods, and the preparation of organic compounds. It can solve the problems of low product yield, impact on application, harsh catalyst preparation, etc., and achieve catalytic activity. high effect

Inactive Publication Date: 2008-06-11
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the conversion rate of methyl 3-hydroxypropionate and the hydrogenation selectivity have been greatly improved at low temperature, the low concentration makes the yield of the actual product very low, and the harshness of catalyst preparation also greatly affects it. Applications

Method used

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  • Method for producing 1-propylene glycol with 3-hydracrylic acid methyl ester
  • Method for producing 1-propylene glycol with 3-hydracrylic acid methyl ester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 42 grams of copper acetate, 27.6 ml of ethyl orthosilicate, and 300 ml of ethanol were added to the reactor, and the solution was stirred. Heating reaction and aging for 4 hours; filtering; drying at 120°C for 16 hours, and roasting at 400°C for 4 hours. Get CuO(65%wt) / SiO 2 (35%wt) hydrogenation catalyst. The above-mentioned catalyst is crushed into small particles, sieved, and 60-80 mesh particles are taken for later use.

Embodiment 2

[0024] The above 2.0g catalyst particles were reduced with hydrogen at 350°C for 3 hours, and 30ml of methanol, 3g of methyl 3-hydroxypropionate and activated catalyst were added into a 100ml reactor. Hydrogenation reaction was carried out at 150° C. and 9.5 MPa for 20 hours. The catalyst was isolated and sampled for gas chromatographic analysis. The results are shown in Table 1.

Embodiment 3

[0026] The above 2.0g catalyst particles were reduced with hydrogen at 350°C for 4 hours, and 30ml of methanol, 3g of methyl 3-hydroxypropionate and activated catalyst were added to a 100ml reactor. Hydrogenation reaction was carried out at 150° C. and 9.5 MPa for 20 hours. The catalyst was isolated and sampled for gas chromatographic analysis. The results are shown in Table 1.

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Abstract

The invention relates to a method for preparing 1, 3-propylene glycol reaction hydrogenated by 3-hydroxy methyl propionate, which adopts CuO-SiO2 as catalyst and can realize 1, 3-propylene glycol reaction hydrogenated by 3-hydroxy methyl propionate under milder conditions, wherein the highest conversion rate of 3-hydroxy methyl propionate is 97.8% and the highest selectivity of 1, 3-propylene glycol is 93.4%.

Description

technical field [0001] The invention relates to a method for preparing 1,3-propanediol by hydrogenating methyl 3-hydroxypropionate. Background technique [0002] Hydrogenation of fatty acid esters to alcohols is currently the main method for producing fatty alcohols in the world. Cu-Cr catalysts with high catalytic activity and good selectivity are generally used, but such catalysts are usually used at high temperatures (200-350°C) and It is only active under the condition of high pressure (20-30) MPa. Most ester compounds have good thermal stability, and good hydrogenation products can be obtained by using high-temperature hydrogenation catalysts. But for some carboxylate compounds containing other functional groups, the thermal stability at high temperature is far less than that of compounds containing only carboxylate groups, and the chemical properties of these functional groups are different, making carboxylate compounds containing heat-sensitive groups Hydrogenation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C27/02B01J23/72B01J21/08
Inventor 崔芳陈静夏春谷张宏祥童进黄志威
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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