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Preparation method of dihydric alcohol

A diol and glucose technology, applied in the preparation of organic compounds, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of complex process and many process steps, and achieve the effect of simplifying the process and reducing the operation steps.

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

[0008] The reaction raw material starch of this method can be obtained by corn as a raw material, which belongs to renewable resources. Compared with the method of dihydric alcohol produced by using petroleum as raw material, it has certain advantages, but this method has more process steps, and glucose plus The sorbitol product after the hydrogen reaction requires sedimentation, filtration, separation, and decolorization steps, and the process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve a certain amount of glucose in water to prepare a 30% glucose aqueous solution, take 300g of the solution and add it to a 500mL autoclave, add 22.5g of activated Raney nickel catalyst, adjust the pH to 13.5 with sodium hydroxide, and turn off the high pressure Vacuumize the kettle after leak test with nitrogen pressure, and replace it with hydrogen for 3 times, then heat up, and after the reaction temperature rises to 140°C, fill it with hydrogen to a pressure of 7MPa and react for 1 hour; then, raise the reaction temperature to 240°C ℃, filled with hydrogen until the pressure is 12MPa, after reacting for 1 hour, sampling was carried out and analyzed by high pressure liquid chromatography, the results are as follows:

[0022] The conversion rate of glucose is 100%, and the selectivity of different products is: ethylene glycol 19%, propylene glycol 58%, butanediol (including all isomers) 5%, glycerol 9%, sorbitol 5%, other 4%.

Embodiment 2

[0024] Operation is substantially the same as in Example 1, except that the catalyst is CuO-ZnO, and the reaction results are as follows:

[0025] The conversion rate of glucose is 100%, and the selectivity of different products is: ethylene glycol 15%, propylene glycol 42%, butanediol (including all isomers) 10%, glycerol 12%, sorbitol 15%, other 6%.

Embodiment 3

[0027] Operation is substantially the same as in Example 1, except that the catalyst is ruthenium / carbon, and the reaction results are as follows:

[0028] The conversion rate of glucose is 100%, and the selectivity of different products is: ethylene glycol 16%, propylene glycol 47%, butanediol (including all isomers) 9%, glycerol 12%, sorbitol 6%, other 10%.

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Abstract

The invention discloses a preparation method of dihydric alcohol, comprising the following steps of: reacting dextrose water with the pH value of 12-14 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 glucose is used as a raw material; then raising the temperature to 220-250 DEG C, and reacting for 0.5-2 hours at the hydrogen pressure of 10-13 MPa; and cooling, filtering and rectifying a reaction product to obtain the dihydric 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 glucose, andthe dihydric alcohol is a dihydric alcohol which has a carbon number of 2-4. The invention is mainly used for preparing the dihydric alcohol and especially used for preparing the dihydric alcohol which has the carbon number of 2-4.

Description

technical field [0001] The invention relates to a preparation method of dihydric alcohol, in particular to a preparation method of dihydric alcohol with 2-4 carbon numbers. 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 method for producing diols with new raw materials and new processes. For example, Chinese patent ZL 200610068869.5 discloses a production process of ethylene glycol, which uses starch as raw material, including the preparation of glucose syrup with DX value, hydrogenation reaction, refining of sorbitol solution, hydrogenolysis of sorbitol, and refining of polyol mixture and separation processes, the specific steps are as follows: [0003] (1) Af...

Claims

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Application Information

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IPC IPC(8): C07C29/00C07C31/20
Inventor 吕剑张伟李春迎郝志军亢建平寇联岗刘波马洋博何飞李凤仙
Owner XIAN MODERN CHEM RES INST
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