A method for supercritical fluid catalyzed liquefaction of plant raw materials

Abstract

The invention discloses a method for supercritical fluid catalyzed liquefaction of plant raw materials, which comprises the following steps: (1) crushing the plant raw materials, passing through a 40-60 mesh sieve, and drying; (2) adding plant raw materials and Alcohol solvent, using solid heteropoly acid as a catalyst, reacting in a supercritical state for 10-50 minutes, washing out the liquefied product with absolute ethanol, and obtaining biomass oil through suction filtration and rotary evaporation. The invention can greatly improve the liquefaction rate of plant raw materials; use solid heteropolyacid as a catalyst to replace traditional liquid strong acid catalysts such as H2SO4, HCl, HNO3, etc., and has the advantages of less environmental pollution, no corrosion of equipment, and easy separation; the obtained The content of esters in biomass oil is high, especially the content of levulinic acid ester is as high as 20.82%. It can be directly used as gasoline additives and biological liquid fuels. It has the advantages of non-toxicity, high lubricity, and high calorific value. It is a kind of 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...

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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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