Method for preparing liquid fuel from biomass through hydrogen-donor solvent

Abstract

The invention discloses a method for preparing a liquid fuel from biomass through a hydrogen-donor solvent. The method is as follows: under mild conditions, a proper catalyst and a hydrogen-donor solvent are used to directly perform liquefaction treatment on a biomass raw material without using hydrogen gas to produce high-quality fuel oil which can replace petroleum products. The method adopts the proper chemical reaction environment and solves the problems of the existing method that biomass can not be used to prepare oil in the physical environment of a large-scale industrial reactor through rapid pyrolysis; and by adopting the method provided by the invention, the reaction in the industrial equipment or experimental equipment has good repeatability, the technology is simple, the equipment configuration is less, the demand on pressure is lower than that of the high-pressure liquefaction technology, and hydrogen gas is not used for reaction. Thus, the method has wide application prospect in the development and utilization of biomass energy.

Description

technical field [0001] The invention relates to the technical field of renewable energy, in particular to a method for producing liquid fuel from biomass by using a solvent to supply hydrogen. Background technique [0002] The production of liquid fuels from biomass currently mainly adopts pyrolysis methods, which are generally divided into high-pressure liquefaction, rapid pyrolysis and conventional pyrolysis. The high-pressure liquefaction pressure is generally about 20MPa, the temperature is 250-400°C, and the material residence time is 15min-2h. 2 Fuel oil with better quality and higher calorific value can be obtained by pyrolysis under the action of a catalyst; fast pyrolysis at normal pressure, heating rate of 1000-10000°C / S, reaction temperature of about 500°C, material residence time of 0.5-1S, liquid yield Higher, but the calorific value of its products is lower; the conventional cracking temperature is less than 500°C, the heating rate is 10-100°C / min, and the mat...

AI Technical Summary

Problems solved by technology

Therefore, the existing rapid biomass pyrolysis process must strictly limit the residence time of the product at high temperature

However, if a large-scale industrial reactor is used, it is impossible for all the intermediate products to be discharged quickly due to the back-mixing of the materials. Therefore, the liquid fuel products of the existing biomass rapid cracking process generally cannot reach the small-scale The yield of the test unit is high, and sometimes the oil production rate of the industrial unit is much lower than that of the test unit

This is a difficult problem for the existing biomass rapid pyrolysis process in the physical environment of large-scale industrial reactors

[0009] In addition, the product composition of rapid pyrolysis of biomass is relatively complex, with a water content of 15-30m%, an oxygen content of 40-50m%, a low hydrogen-to-carbon ratio, and a low calorific value. Post-processing is difficult and costly

[0010] If the hot gas flow is used as the heat carrier, most of the products will be discharged in a gaseous state mixed with the heat-carrying gas flow, and it will be difficult to collect condensation, requiring huge cooling and condensing equipment, or the recovery of liquid is not complete, and the overall production cost is not advantageous

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