Method for preparing 1,2-propylene glycol by catalytic hydrogenation of biodiesel base crude glycerine

A biodiesel, catalytic hydrogenation technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as low yield of propylene glycol, high reaction temperature, environmental pollution, etc., and achieve less environmental pollution, The effect of low reaction temperature and low purity requirements

Inactive Publication Date: 2009-02-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a biodiesel-based crude glycerol that can directly use biological Process and Catalyst for Preparation of 1,2-Propanediol by Direct Hydrogenation of Diesel-Based Crude Glycerin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Accurately measure 20 grams of biodiesel-based crude glycerol with a glycerol content of 85.1% and put it into an autoclave, add 0.5 grams of Cu / MgO catalyst (the Cu loading is 5 wt%, prepared by impregnation method), seal it and replace it with hydrogen The air in the kettle is then filled with 3.0MPa hydrogen. Heating and starting stirring at the same time, controlling the temperature in the reaction kettle to 220° C., and reacting for 20 hours. After the reaction, the reaction kettle was cooled to room temperature, and the reaction solution was filtered under reduced pressure to separate the reaction product solution from the catalyst. Analysis showed that the conversion rate of glycerol was 72.5% and the molar yield of 1,2-propanediol was 67%.

Embodiment 2

[0039] Accurately measure 20 grams of biodiesel-based crude glycerol with a glycerol content of 85.1% and put it into an autoclave, add 0.5 grams of Cu / MgO catalyst (the Cu loading is 5 wt%, prepared by impregnation method), seal it and replace it with hydrogen The air in the kettle is then filled with 3.0MPa hydrogen. Heating and starting stirring at the same time, controlling the temperature in the reactor to 220° C., and reacting for 12 hours. After the reaction, the reactor was cooled to room temperature, centrifuged first, then decompressed and filtered the reaction solution to separate the reaction product solution and the catalyst, and analyzed to obtain a conversion rate of 61% of glycerol and a molar yield of 1,2-propanediol. 57.5%.

Embodiment 3

[0041] Accurately measure 20 grams of biodiesel-based crude glycerol with a glycerol content of 85.1% and put it into an autoclave, add 0.5 grams of Cu / MgO catalyst (the Cu loading is 5 wt%, prepared by impregnation method), seal it and replace it with hydrogen The air in the kettle is then filled with 3.0MPa hydrogen. Heating and starting stirring at the same time, controlling the temperature in the reaction kettle to 220° C., and reacting for 6 hours. After the reaction was finished, the reactor was cooled to room temperature, and the reaction solution was filtered under reduced pressure to separate the reaction product solution from the catalyst. Analysis showed that the conversion rate of glycerin was 44.7% and the molar yield of 1,2-propanediol was 42%.

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Abstract

The invention relates to a method for directly preparing 1,2-propylene glycol by biological diesel based crude glycerin. The biological diesel based crude glycerin is used as the raw material, and under the action of solid alkali-copper metal catalyst, the reaction is proceeded for 6-20 hours under the temperature of 180-260 DEG C, and the 1,2-propylene glycol is prepared by a batch type one-step reaction. The highest conversion rate of glycerin can reach 91.3 percent, and the yield of 1,2-propylene glycol can reach 85 percent. Compared with the existing method for preparing 1,2-propylene glycol, in the invention, the solid alkali-copper metal catalyst can effectively overcome the influence of alkaline impurity in biological diesel based crude glycerin solution. The method of the invention has the advantages of simple process, high yield, low cost, less environmental pollution and simple separation.

Description

Technical field: [0001] The invention relates to a method for directly preparing 1,2-propanediol through catalytic hydrogenation of biodiesel-based crude glycerin, in particular to a copper-solid alkali catalyst and a preparation method in the method for preparing 1,2-propanediol. Background technique: [0002] 1,2-Propylene glycol (1,2-PDO for short) is a colorless, viscous, stable hygroscopic liquid, almost tasteless, odorless, and flammable. Melting point -60°C. Boiling point 187.3°C, relative density 1.036 (25 / 4°C), miscible with water, ethanol and various organic solvents. It is easily oxidized above 150°C. 1,2-propanediol is an important raw material for unsaturated polyester, epoxy resin, polyurethane resin, and this unsaturated polyester is widely used in surface coatings and reinforced plastics. 1,2-propanediol has good viscosity and hygroscopicity, and is non-toxic, so it is widely used as a hygroscopic agent, antifreeze, lubricant and solvent in the food, pharm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/00
CPCY02P20/584
Inventor 袁振乐侯昭胤高静王军华梁丹陈平郑小明
Owner ZHEJIANG UNIV
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