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Method for synthesizing dihydric alcohol and polyhydric alcohol

A synthesis method and technology of polyols, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as high reaction temperature and pressure, shortage, complicated process flow, etc., achieve mild reaction conditions, reduce Equipment requirements, the effect of simplifying the process

Inactive Publication Date: 2010-07-21
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, petroleum is a non-renewable resource and is facing an increasingly severe shortage, so it is necessary to find a new raw material and new process to produce diols
For example, U.S. Patent No. 5,107,018 discloses a method for preparing polyols with sucrose as a raw material. The method uses cobalt, copper, and manganese as active metals for catalysts to prepare polyols such as ethylene glycol, propylene glycol, and hexylene glycol. However, the method The reaction temperature is 180℃~280℃, and the reaction pressure is 200bar~700bar. Before the reaction, ethylene glycol, propylene glycol, etc. should be used to form a suspension with the catalyst to promote the reaction. The reaction temperature and pressure are relatively high. complicated process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A certain amount of sucrose is dissolved in water to prepare an aqueous solution with a mass percent content of 25%. Take 300g of this solution and add it to a 500mL autoclave, adjust the pH to 13, add 22.5g of activated Raney nickel catalyst, close the autoclave, pressurize the autoclave, test for leaks under nitrogen pressure, vacuumize, replace with hydrogen for 3 times, and then heat up After the reaction temperature rises to 140°C, fill in hydrogen until the reaction pressure is 7MPa to start the catalytic hydrogenation reaction. After 1 hour of reaction, raise the temperature to 240°C and react for 1 hour under the reaction pressure of 12MPa. Take a sample and use High-pressure liquid chromatography analysis, product composition and content are respectively: ethylene glycol 18%, propylene glycol 50%, butanediol (comprising all isomers) 9%, glycerol 10%, sorbitol and mannitol 3%, other 10%.

Embodiment 2

[0017] Operation is substantially the same as in Example 1, except that the catalyst is CuO-ZnO, and the reaction results are as follows:

[0018] The conversion rate of sucrose is 100%, and the selectivity of different products is: ethylene glycol 15%, propylene glycol 40%, butanediol (including all isomers) 10%, glycerol 15%, sorbitol and mannitol 5% , the other 15%.

Embodiment 3

[0020] Operation is substantially the same as in Example 1, except that the catalyst is ruthenium / carbon, and the reaction results are as follows:

[0021] The conversion rate of sucrose is 100%, the selectivity of different products is: ethylene glycol 16%, propylene glycol 48%, butanediol (including all isomers) 9%, glycerol 12%, sorbitol and mannitol 4% , the other 11%.

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Abstract

The invention discloses a method for synthesizing dihydric alcohol and polyhydric alcohol, comprising the following steps of: firstly reacting an aqueous sucrose solution with the pH value of 11-14 and the weight percentage content of 10-50 percent for 0.5-2 hours in the presence of a hydrogenolysis catalyst at the reaction temperature of 130-150 DEG C and the hydrogen pressure of 6-8 MPa, wherein sucrose is used as a raw material; then reacting for 0.5-2 hours at the reaction temperature of 220-250 DEG C and the hydrogen pressure of 10-13 MPa; and cooling, filtering and rectifying a reactionproduct to obtain the dihydric alcohol and the polyhydric alcohol, wherein the hydrogenolysis catalyst is Raney nickel, ruthenium / carbon, nickel / ruthenium or CuO-ZnO, the usage amount of the hydrogenolysis catalyst is 15-30 percent relative to the mass of the sucrose, the dihydric alcohol comprises ethylene glycol, propylene glycol and butanediol, and the polyhydric alcohol comprises propanetriol, sorbierite and mannite. The invention is mainly used for synthesizing the dihydric alcohol and the polyhydric alcohol.

Description

technical field [0001] The invention relates to a method for synthesizing dihydric alcohols and polyhydric alcohols. Background technique [0002] At present, the industry mainly uses petroleum as raw material to produce glycols, for example, ethylene glycol is produced from ethylene oxide, and propylene glycol is produced from propylene oxide. However, petroleum is a non-renewable resource and is facing an increasingly serious shortage situation, so it is necessary to find a new raw material and new process to produce diols. For example, U.S. Patent No. 5,107,018 discloses a method for preparing polyols with sucrose as a raw material. The method uses cobalt, copper, and manganese as active metals for catalysts to prepare polyols such as ethylene glycol, propylene glycol, and hexylene glycol. However, the method The reaction temperature is 180℃~280℃, and the reaction pressure is 200bar~700bar. Before the reaction, ethylene glycol, propylene glycol, etc. should be used to fo...

Claims

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Application Information

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IPC IPC(8): C07C29/00C07C31/20C07C31/22C07C31/26
Inventor 吕剑张伟李春迎郝志军寇联岗刘波马洋博何飞
Owner XIAN MODERN CHEM RES INST
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