Microwave-assisted method for preparing biomass-based motor gasoline by rapidly pyrolyzing straws and waste nigre under co-catalysis of double bed layers

Abstract

The invention discloses a microwave-assisted method for preparing biomass-based motor gasoline by rapidly pyrolyzing straws and waste nigre under the co-catalysis of double bed layers. The microwave-assisted method comprises the steps: 1) weighing straws and waste nigre according to the mass ratio of 1:1 to 1:10, and uniformly mixing the straws and the waste nigre; 2) placing a catalyst into a U-shaped quartz tube connected with a pyrolysis steam outlet of a double-neck quartz bottle according to the mass ratio (1:1 to 1:10) of an HZSM-5 molecular sieve based catalyst to a mixture of the straws and the waste nigre, and adding a microwave absorbent into a quartz cup; and 3) embedding the double-neck quartz bottle and the U-shaped quartz tube into the quartz cup, placing the quartz cup intoa microwave pyrolysis instrument, carrying out heating to 450-650 DEG C, rapidly adding the mixture of the straws and the waste nigre into the double-neck quartz bottle, carrying out catalytic reforming on the U-shaped quartz tube by using the catalyst, and carrying out condensation by using a condensation tube to form hydrocarbon-enriched biomass-based motor diesel oil. By using the microwave-assisted method, the carbonization time is greatly shortened, the yield and quality of bio-oil are improved, and the content of hydrocarbons in the bio-oil is remarkably increased.

Description

technical field [0001] The invention belongs to the technical field of biomass energy conversion, and mainly relates to a method for preparing biomass-based gasoline for vehicles from straw and waste soapstock. Background technique [0002] With the rapid consumption of fossil fuels and the deterioration of the environment, the rapid pyrolysis of biomass to produce renewable fuels has attracted more and more attention from researchers. However, the bio-oil obtained by this technology has high oxygen content, low calorific value, poor thermal stability, high viscosity, high acidity, and strong corrosion, so its further application has been greatly limited. It is worth noting that these disadvantages are closely related to the high oxygen content in bio-oil. In order to improve the quality of bio-oil, microwave rapid catalytic pyrolysis of biomass to prepare hydrocarbon-rich bio-oil technology came into being. By combining rapid pyrolysis and catalytic reforming oil productio...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of high oxygen content, low calorific value, poor thermal stability, high viscosity, high acidity and strong corrosiveness of the bio-oil obtained by the existing biomass pyrolysis technology, and to provide a microwave-assisted double-bed A method for preparing biomass-based motor gasoline by layer co-catalysis and rapid pyrolysis of straw and waste soapstock. The method is simple in process, fast in pyrolysis, and the obtained pyrolysis bio-oil has low oxygen content, high hydrocarbon content, and strong stability. High calorific value, similar properties to gasoline, can be directly mixed with motor gasoline in proportion