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Catalytic cracking method for sugar and sugar alcohol

A technology of catalytic cracking and sugar alcohol, which is applied in the fields of chemical instruments and methods, organic chemistry, hydroxyl compound preparation, etc., can solve the problems of harsh cracking conditions, non-recyclable regeneration, and high technical difficulty, so as to alleviate the tension of petroleum resources, high Catalytic activity and selectivity, low cost effect

Inactive Publication Date: 2009-12-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these synthetic routes are mature, they have the following limitations: (1) This technical route uses fossil resources such as ethylene and propylene as raw materials, and the reserves are limited and cannot be recycled.
(2) The production process requires catalytic processes such as epoxidation and hydration, which are technically difficult, long in route and low in efficiency
The cracking conditions are harsh, the efficiency is low, the conversion rate and selectivity are not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh nickel nitrate and cerium nitrate solution (Ni:Ce=5:2, mass ratio), add dried activated carbon (Ni loading is 8% (total weight of catalyst)), impregnate for 24h, and dry for 12h. Then, under the protection of nitrogen, it was baked in a quartz tube for 5 hours.

Embodiment 2

[0024] The preparation process of catalyst 2-11 was carried out by the method of Example 1, except that different metal components and mass ratios and different supports were changed. See Table 1 for details.

[0025] Table 1

[0026] Numbering

Embodiment 3

[0027] The catalytic cracking reaction of embodiment 3 xylitol

[0028] 200g of 30% xylitol aqueous solution and 10g of catalyst were transferred to the autoclave. After replacing the air for 3-5 times, heat to 200°C, then fill with hydrogen at a pressure of 5MPa, stir rapidly, and the reaction starts. After reacting for 6 hours, the stirring was stopped, the temperature was lowered to room temperature, and the hydrogen was removed. Sampling analysis. The quantification of xylitol was analyzed by high performance liquid chromatography, and the quantification of ethylene glycol and propylene glycol was analyzed by gas chromatography. The results are shown in Table 2.

[0029] Table 2

[0030]

[0031] 5

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PUM

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Abstract

The invention relates to a method for preparing low-carbon alcohol through the catalytic cracking of sugar and sugar alcohol, which comprises the steps: under the action of an Ni-based catalyst, taking polycarbon sugar such as glucose, fruit sugar, xylose, sorbierite, mannite and xylitol, and water solution of various carbon sugar and sugar alcohol as raw materials, and cracking the raw materials into low-carbon alcohol of C3 or below C3 (particularly glycol and 1,2-propanediol) in a high selectivity mode through hydrogenation and dehydration processes. The conversion rate of the raw materials reaches over 95 percent. The yield of the glycol and the 1,2-propanediol in the low-carbon alcohol reaches over 50 percent. The method has the advantages of high efficiency, mild conditions, and high selectivity of the low-carbon alcohol.

Description

technical field [0001] The present invention relates to the catalytic cracking of sugars and sugar alcohols derived from biomass to prepare C 2 and C 3 A method for low-carbon alcohols, especially a method for catalytically cracking sugar and sugar alcohols to generate ethylene glycol and 1,2-propanediol. Background technique [0002] Low-carbon alcohols such as ethanol, ethylene glycol, propanol, propylene glycol and glycerin are important petrochemical raw materials, mainly used as energy liquid fuels, organic solvents and synthetic intermediates; they are also key chemicals for the synthesis of polyester. Ethylene glycol can also be used in industries such as antifreeze, lubricant, plasticizer, surfactant, paint, photographic developer, brake fluid and ink; propylene glycol can be widely used in food, medicine and cosmetic industries as a hygroscopic agent , antifreeze, lubricant and solvent, and can also be used as tobacco moisturizer, antifungal agent and fruit ripeni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/00C07C31/18
Inventor 徐杰于维强苗虹赵静宋奇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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