Device and method for performing continuous pretreatment on lignocellulose material by utilizing microwave-diluted acid steam explosion

Abstract

The invention provides a device and method for performing continuous pretreatment on lignocellulose material by utilizing microwave-diluted acid steam explosion and relates to the field of biomass pretreatment. The lignocellulose material is conveyed into a feeder, and diluted acid in a diluted acid tank is continuously sprayed to the material through a spraying valve to be steeped. The material enters an anti-back spraying pressurization screw device and undergoes kneading, extrusion dehydration, pressurization and accelerated steeping in the anti-back spraying pressurization screw device and then enters a reaction retention device; in the reaction retention device, the material undergoes combined effects of microwaves and saturated steam and performs spray explosion on a cyclone separator through a spray explosion valve, and a solid product is separated. The lignocellulose undergoes continuous treatment of combination of microwave pretreatment and diluted acid steam explosion pretreatment for the first time, and the device capable of implementing the process smoothly is designed. According to the method, the lignocellulose treatment amount is improved, the treatment cycle is shortened, the energy consumption is reduced, the enzymatic accessibility of the material after pretreatment is improved, and the cellulose enzymolysis rate is improved.

Description

technical field [0001] The invention relates to the field of biomass pretreatment, in particular to a device and method for continuous pretreatment of lignocellulosic materials by using microwave-dilute acid steam explosion, mainly used for pretreatment of lignocellulose raw materials. Background technique [0002] Since the 21st century, human demand for energy has increased dramatically. With the excessive exploitation of fossil fuels and the impact of the greenhouse effect caused by carbon dioxide emissions, the world is facing unprecedented resources, energy, and environmental problems. Under such severe environmental pressure, finding resource-saving, environment-friendly and renewable new energy has become an urgent problem to be solved. my country is a large agricultural country with abundant cellulose resources. There are more than 600 million tons of various biomass wastes every year, but the utilization rate of cellulose is not high, and the current utilization rat...

AI Technical Summary

Problems solved by technology

my country is a large agricultural country with abundant cellulose resources. There are more than 600 million tons of various biomass wastes every year, but the utilization rate of cellulose is not high, and the current utilization rate is less than 3%.

[0004] At present, the commonly used pretreatment technologies in China include physical methods, chemical methods, biological methods, etc., and there are some defects in these pretreatments. For example, the patent of Publication No. CN103773815A discloses a technology that utilizes benzene / ethanol to dewax lignocellulose , but this method uses the chemical product benzene, the recovery cost is high, and the environmental load is large; as disclosed in the publication number CN102261004A, a pretreatment method combining a microbial method and a chemical method, wherein the biological method has a longer reaction time and lower efficiency, Therefore, it is currently limited to the experimental and pilot stage, and it is difficult to industrialize

In addition, although the dilute acid steam explosion method is recognized as a promising pretreatment method, due to the high processing intensity, it is easy to produce substances that have an inhibitory effect on subsequent fermentation.

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