A method for refining and upgrading biomass pyrolysis oil

Abstract

The invention discloses a biomass pyrolytic oil refining quality-improvement method, belonging to the technical field of biomass energy conversion and utilization. The method comprises the steps that hydrogen is used as a hydrogen donor, AC arc discharge is generated under the effect of high-frequency voltage, and the hydrogen is ionized, and then is introduced in a solid-liquid mixed phase consisting of a catalyst and biomass pyrolytic oil for hydrogenation reaction. The heat effect of the AC arc causes low-boiling components in refined oil to vaporize and escape and is collected by condensation. After the reaction, heavy components are extracted and separated to obtain organic solvent phase and aqueous phase products, and then the organic solvent phase is distilled to obtain the refined oil heavy components. According to the biomass pyrolytic oil refining quality-improvement method provided by the invention, the AC arc is used to activate reactants to reduce the activation energy of the hydrogenation reaction, so that the hydrogenation reaction is carried out under normal pressure at lower temperature, thereby reducing the interaction of various components of the biomass pyrolysis oil; the impact, on the catalyst surface, of the high-energy electrons generated in a discharge process, and the reduction of the interaction reaction can effectively avoid the catalyst in the hydrogenation reaction from coking inactivation, and the reaction can be carried out continuously.

Description

technical field [0001] The invention belongs to the technical field of biomass energy and its transformation and utilization, and relates to a method for refining and upgrading biomass pyrolysis oil, in particular to a method for using AC arc discharge to make hydrogen and biomass pyrolysis oil under normal pressure and lower temperature The following method of reaction. Background technique [0002] With the increasing demand for energy, the decrease of fossil energy, and the serious environmental pollution caused by its overuse, people need to explore and develop a clean new energy as soon as possible. As a renewable energy source, biomass, which widely exists in nature, has attracted extensive attention from scholars at home and abroad because of its advantages of low nitrogen and sulfur content and zero carbon dioxide emissions. [0003] Biomass pyrolysis liquefaction technology has the characteristics of simple operation process, fast reaction, high conversion rate, an...

AI Technical Summary

Problems solved by technology

[0005] (1) Before the catalytic hydrogenation of biomass pyrolysis oil, impurities must be removed, and the process operating conditions are relatively harsh; in order to ensure the hydrogenation reaction rate and depth, catalytic hydrogenation generally needs to be carried out at high temperature and high pressure, resulting in equipment technical content and The cost is high and the operation process is complicated; (2) Biomass pyrolysis oil has complex components and poor thermal stability. After being heated above 80°C, it will produce intense polymerization and coking reactions, and the viscosity will increase rapidly. Coking causes problems such as reactor blockage and catalyst deactivation to easily occur during operation, and the catalyst is difficult to regenerate, and the process cannot be continuous

[0006] To sum up, catalytic hydrodeoxygenation is currently the most effective biomass pyrolysis oil refining and upgrading technology, but there is still a big gap from practicality, there are still high equipment and catalyst costs, complex operation process, high temperature catalyst Carbonization and coking deactivation and the resulting technological bottlenecks such as uncontinuity of the process

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