Method for preparing levoglucosan from cellulose by catalytic pyrolysis

A technology for levo-glucan and catalytic pyrolysis, which is applied in the field of biomass energy utilization, can solve the problems of low yield of levo-glucan and high cost of separation and extraction, and achieves easy separation and extraction, high yield and high purity. Effect

Active Publication Date: 2011-04-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing levoglucosan by catalytic pyrolysis of cellulose, so as to overcome the defects of low levoglucosan yield and high cost of separation and extraction in bio-oil obtained by direct pyrolysis and liquefaction of cellulose

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  • Method for preparing levoglucosan from cellulose by catalytic pyrolysis
  • Method for preparing levoglucosan from cellulose by catalytic pyrolysis

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Effect test

Embodiment 1

[0021] Commercial microcrystalline cellulose is used as raw material, with an average particle size of 0.05mm, mixed with copper powder with a particle size of 0.5mm, the mixing ratio of the two is 2:1, and then the mixed material is pyrolyzed at 420°C under a nitrogen atmosphere In 10 seconds, the yield of the liquid product was 76%, and the levoglucosan content was analyzed by gas chromatography, and the yield of levoglucosan was calculated to be 46%.

Embodiment 2

[0023] Using commercial microcrystalline cellulose as raw material, the average particle size is 0.05mm, mixed with brass powder with a particle size of 0.5mm, the mixing ratio of the two is 1:2, and then the mixed material is heated at 400 ° C under an inert gas atmosphere ( With the combustible gas produced by pyrolysis as protective gas) under pyrolysis for 10s, the yield of liquid product obtained was 80%, and the content of levoglucosan was analyzed by gas chromatography, and the yield of levoglucosan was calculated to be 56%. %.

Embodiment 3

[0025] Commercial α-cellulose is used as raw material with an average particle size of 0.19mm, mixed with brass powder with a particle size of 1.0mm, the mixing ratio of the two is 1:2, and then the mixed material is heated at 380°C under an inert gas atmosphere ( With the combustible gas produced by pyrolysis as protective gas) under pyrolysis for 10s, the yield of liquid product obtained was 74%, and the content of levoglucosan was analyzed by gas chromatography, and the yield of levoglucosan was calculated to be 50%. %.

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Abstract

The invention belongs to the field of utilization of biomass energy, and in particular relates to a method for preparing levoglucosan from cellulose by catalytic pyrolysis. The method comprises the following steps of: mechanically mixing copper powder serving as a catalyst and cellulose powder; performing fast pyrolysis under an oxygen-free condition at the temperature of between 280 and 450 DEG C; condensing pyrolysis gas to obtain a levoglucosan-rich liquid product; and burning solid residues to recover the copper powder catalyst. In the product prepared from the cellulose by the catalytic pyrolysis of the copper powder, the levoglucosan has high yield and purity and is convenient to subsequently separate and extract; in addition, the solid copper powder is used as the catalyst, is veryconvenient to recover, does not substantially have the problem such as inactivation and the like and can be repeatedly recycled.

Description

technical field [0001] The invention belongs to the field of utilization of biomass energy, and in particular relates to a method for preparing levoglucosan by catalytic pyrolysis of cellulose. Background technique [0002] Biomass pyrolysis liquefaction technology came out in the late 1970s. It is a process in which biomass is rapidly decomposed by heat under conditions of moderate temperature and anoxic conditions to form liquid bio-oil, a certain amount of solid coke and combustible gas. A variety of high value-added chemicals can be formed during the pyrolysis and liquefaction process of biomass, including many substances that are difficult to synthesize by conventional means. However, the selectivity in the conventional pyrolysis process of biomass is very poor, and more than 400 kinds of organic substances will be formed. Therefore, the content of most substances in conventional bio-oil is very low, which makes the separation and extraction not only technically difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/02
CPCY02P20/584
Inventor 陆强董长青张旭明张志飞张俊姣田慧云杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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