Method for preparing levoglucosan from cellulose by catalytic pyrolysis

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...

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