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Method for promoting solid catalyst to depolymerize cellulose

A solid catalyst, solid acid catalyst technology, applied in chemical instruments and methods, preparation of organic compounds, oligosaccharides, etc., can solve the problems of mass transfer and acid site contact, long ball milling pretreatment time, and high energy consumption. Overcome the effects of acid discharge, short ball milling time and simple process

Inactive Publication Date: 2014-03-12
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for promoting the depolymerization of cellulose with a solid catalyst, which solves the problems of mass transfer and acid site contact between the solid catalyst and cellulose, and overcomes the long time and low efficiency of traditional ball milling pretreatment. Low, high energy consumption issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 1g of microcrystalline cellulose ( PH-101, purchased from sigma-aldrich), weighed 0.9g zirconium phosphate (solid acid catalyst), put cellulose and zirconium phosphate together in the same ball mill jar, and milled in the ball mill for 1h. After the ball milling, take out two Then mix it with 50ml of water and 0.075g of Ru / C and put it into a batch reactor with a capacity of 100ml, fill it with hydrogen to make the pressure of the reactor 6MPa, heat it to 190°C, react for 2.5 hours, take out The product was analyzed.

[0018] Control 1: traditional ball milling method

[0019] Weigh 1g of microcrystalline cellulose ( PH-101 (purchased from sigma-aldrich) and 0.9g zirconium phosphate (solid acid catalyst), put the cellulose and zirconium phosphate in different ball mill jars, and mill in the ball mill for 1h. After the ball milling, take out the cellulose and zirconium phosphate, then mixed with 50ml of water and 0.075gRu / C and added to a batch reactor with a ...

Embodiment 2

[0028] Referring to Example 1, the difference is that the ball milling time is 4h, using α-cellulose instead of microcrystalline cellulose, the results show that the traditional ball milling method makes the cellulose partially converted into sorbitol and mannitol, and the conversion rate of cellulose is 87%, The total yield of sorbitol and mannitol was 70.7%, and the selectivity of sorbitol and mannitol was 81.3%. The conversion rate of cellulose by the method of the present invention is 100%, the total yield of sorbitol and mannitol is 84%, and the selectivity of sorbitol and mannitol is 84%. Other products of cellulose conversion are small alcohols, some gaseous products, and some unidentified substances. The comparison results show that the method of the invention can promote the depolymerization of cellulose by the solid catalyst.

Embodiment 3

[0030] Referring to Example 1, the difference is that 0.9g of zirconium phosphate is replaced by 0.9gH-MOR (mordenite), and the ball milling time is 2h. The results show that the traditional ball milling method partially converts cellulose into sorbitol and mannitol, and the conversion rate of cellulose is 48%, the total yield of sorbitol and mannitol is 25%, the selectivity of sorbitol and mannitol is 52%, utilizes the transformation rate of method cellulose of the present invention 81.5%, the total yield of sorbitol and mannitol is 40%, the selectivity of sorbitol and mannitol is 49%. The comparison results show that the method of the invention can promote the depolymerization of cellulose by the solid catalyst.

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Abstract

The invention discloses a method for promoting a solid catalyst to depolymerize cellulose. The method comprises the following steps: placing the cellulose and the solid catalyst into a ball-milling device; performing mixed ball milling on the cellulose and the solid catalyst; and after ball milling is finished, taking out the mixed cellulose and solid catalyst to be used as a reaction substrate and a catalyst for consequent reactions. By the method, the characteristics of ball milling are maintained and the effect between the cellulose and the catalyst is promoted; the method is simple in process, short in ball-milling time, low in energy consumption, quick in consequent reaction and efficient and energy-saving; the catalyst is convenient to recover and easy to industrialize; and the conversion ratio of the cellulose can reach 100 percent. The method provided by the invention does not need inorganic acid, avoids discharge of acid liquid, is an environment-friendly process, and overcomes the defects of discharge of acid liquid, high requirements on equipment, high energy consumption, low yield and low selectivity of target products and the like in the existing production method.

Description

Technical field: [0001] The invention relates to the technical field of biomass fuel and chemical products, in particular to a method for promoting the depolymerization of cellulose with a solid catalyst. Background technique: [0002] Lignocellulose is a renewable feedstock that can be converted into a variety of fuels and chemicals, helping to reduce our dependence on crude oil. As the most abundant component in lignocellulose, cellulose is a polysaccharide linked by glucose molecules through β-1,4-glycosidic bonds, and there are a large number of hydrogen bonds between molecules and within molecules. Cellulose can obtain platform compounds through microbial fermentation and chemical catalysis, and then continue to convert to biofuels (such as: ethanol, alkanes). Chemical catalysis is a promising approach. Although some solid catalysts have been developed for the depolymerization of cellulose, because the depolymerization of cellulose is a solid-solid phase catalytic rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/26C07C29/00C07H3/06C07H1/00
CPCC07C29/00C07H1/00C07H3/06
Inventor 马隆龙廖玉河王铁军刘琪英张琦龙金星
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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