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Method used for co-production of 1,3-propanediol and 1,2-propanediol via hydrogenation of 3-hydroxypropionaldehyde aqueous solution

A technology of hydroxypropionaldehyde and propylene glycol, which is applied in the preparation of hydroxyl compounds, organic compounds, catalyst activation/preparation, etc., can solve the problems of unpublished selectivity and conversion data, and improve catalyst activity and catalyst efficiency. The effect of specific surface area

Active Publication Date: 2017-11-17
JIANGSU FEIXIANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Hitachi Industrial Equipment Technology Co., Ltd. announced in CN203238195 the dehydrogenation of glycerol under supercritical conditions, water and then hydrogenation, the catalyst used is a noble metal catalyst such as loaded Pt, the reaction pressure is 1-6MPa, and the temperature is 60-280 ° C. One-step method will 3 -Hydroxypropionaldehyde to 1,3-propanediol, selectivity and conversion data not published

Method used

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  • Method used for co-production of 1,3-propanediol and 1,2-propanediol via hydrogenation of 3-hydroxypropionaldehyde aqueous solution
  • Method used for co-production of 1,3-propanediol and 1,2-propanediol via hydrogenation of 3-hydroxypropionaldehyde aqueous solution
  • Method used for co-production of 1,3-propanediol and 1,2-propanediol via hydrogenation of 3-hydroxypropionaldehyde aqueous solution

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Experimental program
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Effect test

Embodiment 1

[0026] The catalyst used is Ni-Zr-Mn / Al 2 o 3 . The catalyst weight components are: Ni=35%, Zr=3%, Mn=2%, and the rest is carrier Al 2 o 3 , the carrier is Al 2 o 3 . Catalyst active components were prepared by gel method and attached to 20-40 mesh Al 2 o 3 superior. Take 5.0ml catalyst, seal and fix both ends with quartz sand, and use hydrogen to activate in situ before the reaction. The activation condition is: GHSV=2500h -1 , pressure 0.2MPa, keep at 150°C for 3h, keep at 200°C for 5h, and lower to 60°C after activation. The reaction temperature is 80°C, the hydrogen pressure is raised to 5.0MPa, the hydrogen-to-oil ratio is 80, the concentration of 3-hydroxypropanal aqueous solution is 35%, the concentration of hydroxyacetone aqueous solution is 10%, and the space velocity of 3-hydroxypropanal including hydroxyacetone is 0.7h -1 , Vent after 2 hours of reaction, take samples every 4h, use gas chromatography (calibrated), and calculate the conversion rate of raw ...

Embodiment 2

[0028] 3-hydroxypropionaldehyde including hydroxyacetone space velocity 0.3h -1 , other conditions are identical with embodiment 1.

Embodiment 3

[0030] 3-hydroxypropionaldehyde including hydroxyacetone space velocity 1.0h -1 , other conditions are identical with embodiment 1.

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Abstract

The invention discloses a method used for co-production of 1,3-propanediol and 1,2-propanediol via hydrogenation of 3-hydroxypropionaldehyde aqueous solution. The method comprises following steps: the 3-hydroxypropionaldehyde aqueous solution is delivered into a reactor loaded with a catalyst, heating and pressurization are carried out, reaction is carried out for a certain period of time, and an obtained 1,3-propanediol product is subjected to refining. The 3-hydroxypropionaldehyde aqueous solution comprises effective ingredients 3-hydroxypropionaldehyde at a mass concentration of 5 to 70% and hydroxyacetone at a mass concentration of 0 to 30%; the molar of hydrogen to the effective ingredients is controlled to be 20-300:1; the mass space velocity of the effective ingredients to the catalyst is controlled to be 0.1-5.0h<-1>; Al2O3, TiO2, or SiO2-Al2O3 is taken as a carrier of the catalyst; and the catalyst comprises, by mass, 10 to 40% of a main active ingredient and 1 to 5% of an auxiliary active ingredient. The method is capable of realizing co-production of 1,3-propanediol and 1,2-propanediol via one step catalytic hydrogenation.

Description

[0001] Technical Field The present invention relates to a method for preparing 1,3-propanediol, especially a method for preparing 1,3-propanediol from 3-hydroxypropionaldehyde aqueous solution obtained after glycerin dehydration and hydration at high temperature. Background technique [0002] With the gradual depletion of traditional fossil fuels and increasingly prominent environmental problems, countries all over the world are working hard to develop biodiesel clean energy. In the biodiesel production process, about 10% of the by-product glycerol can be produced. In recent years, due to the rapid development of the biodiesel industry, there has been a serious surplus of glycerol production. Converting glycerol to propylene glycol is a way of great economic value and development potential. Propylene glycol includes 1,2-propanediol and 1,3-propanediol, which are high value-added fine chemical products. Among them, 1,3-propanediol is an important organic chemical raw material...

Claims

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Application Information

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IPC IPC(8): C07C29/141C07C31/20B01J23/889B01J23/755B01J23/80B01J37/18B01J37/03
CPCB01J23/755B01J23/80B01J23/8892B01J37/036B01J37/18C07C29/141C07C31/205
Inventor 李超吕耀武
Owner JIANGSU FEIXIANG CHEM
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