Method and device for pretreatment of high-temperature liquid water of cellulosic biomass

Abstract

The invention provides a method and a device for performing hydrolysis on hemicellulose in lignocellulose biomass. The method comprises the following steps of: adding lignocellulose biomass of which the granularity is less than 1 centimeter into an internal cylinder of a compression percolation reactor; allowing high-temperature liquid water with low-concentration metal ions serving as a reactionmedium to continuously flow through biomass raw materials in the internal cylinder of the compression percolation reactor in a mode of subsection and variable flow, wherein the temperature of the high-temperature liquid water is between 150 and 200 DEG C, and the pressure is within the saturated vapor pressure of the corresponding temperature to 5 MPa; and simultaneously, recovering xylose after cooling and liquid products taking oligosaccharide of the xylose as predominant matters. The device consists of three parts, namely a reaction medium fed-batch system I for preheating and realizing variable fed-batch reaction media, a compression percolation reactor component II with the compression percolation reactor and a split reactor heating device and a liquid product collecting device III. The method and the device can realize the high-efficiency hydrolysis of hemicellulose components in the lignocellulose biomass, and can realize the continuous and stable collection of hydrolysate.

Description

technical field [0001] The invention relates to the technical field of biomass new energy, in particular to a method for efficient pretreatment of cellulose biomass and a device for realizing the method. technical background [0002] With the energy crisis and environmental pressure caused by the continuous consumption of a large amount of fossil energy, the development of renewable energy has been paid more and more attention by people. Among the many new energy sources, biomass is a clean and renewable energy resource. The production of fuel ethanol by hydrolyzing lignocellulosic biomass to replace some fossil fuels is one of the effective methods to alleviate the oil crisis, and it is very important for the protection of national energy. Safety, the realization of CO2 emission reduction, and the effective promotion of rural economic development are of great significance. [0003] Lignocellulosic biomass is the most promising raw material for fuel ethanol production, and ...

AI Technical Summary

Problems solved by technology

[0005] There are many pretreatment methods, including physical methods, chemical methods, biological methods, etc. Dilute acid pretreatment with better economy and more mature technology has three disadvantages: 1) The reaction is too intense, and there are many by-products, which will inhibit ethanol fermentation ; 2) Reagents are corrosive and have high requirements on equipment, which increases the cost of equipment; 3) Acid radicals are easy to pollute the environment

[0008] At present, the pretreatment of biomass with high-temperature liquid water has been studied at home and abroad, but it is basically in the mechanism and small test stage or the rough concept stage, and there is still a long way to go before industrial application

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