Method for catalyzing liquefaction of plant raw material by supercutical fluid

Abstract

The invention discloses a method for catalyzing the liquefaction of a plant raw material by a supercutical fluid. The method comprises the following steps: 1, crushing the plant raw material, sieving by a 40-60 mesh sieve, and drying; and 2, adding the plant raw material and an alcoholic solvent into an autoclave, reacting in a supercritical state for 10-50min with a solid heteropoly acid as a catalyst, eluting the obtained liquefied product with anhydrous ethanol, carrying out pumping filtration, and carrying out rotary evaporation to obtain biomass oil. The method substantially improves the liquefaction rate of the plant raw material; the method adopting the solid heteropoly acid as a catalyst to substitute a traditional liquid strong acid catalyst, such as H2SO4, HCl and HNO3, has the advantages of small environmental pollution, no corrosion to an apparatus, easy separation and the like; and the obtained biomass oil has a high content of esters, has a highest levulinate content reaching 20.82%, can be directly used as a gasoline additive and biological liquid fuel oil, has the advantages of non-toxicity, high lubricity, high gross calorific value and the like, and is clean energy.

Description

technical field [0001] The invention belongs to the field of green chemical industry, and in particular relates to a method for obtaining high-quality biomass oil by supercritical fluid catalyzed liquefaction of plant raw materials. Background technique [0002] With the increasingly prominent problems of energy security and environmental pollution caused by over-reliance on traditional fossil resources, the use of renewable biomass to replace traditional fossil resources has attracted more and more attention. Every year, a huge amount of plant raw material waste is produced in the process of agricultural and forestry production and processing in my country. People usually use the traditional direct combustion method to dispose of it. This method not only has low resource utilization rate, but also easily causes environmental pollution. Therefore, the efficient liquefaction of plant raw materials to obtain fuels or chemicals through thermochemical conversion methods has appl...

AI Technical Summary

Problems solved by technology

However, the liquefaction rate of plant material is usually low in the absence of catalyst

The research results show that traditional strong acid catalysts such as sulfuric acid and hydrochloric acid can promote the liquefaction of plant raw materials in supercritical fluids, but they have disadvantages such as strong oxidation and strong corrosion, which are not conducive to industrial production

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