Method for separating and extracting lignin-carbohydrate complex from wood fiber prehydrolysis solution

Abstract

The invention discloses a method for separating and extracting lignin-carbohydrate complex (LCC) from wood fiber prehydrolysis solution. The method includes the steps: filtering the wood fiber prehydrolysis solution to remove water insoluble impurities to obtain filter liquor; adding mixed solvents into the filter liquor to extract mixed solution, performing standing on the mixed solution, decanting liquid supernatant to obtain solid, and filtering and washing the solid by mixed solvents until filter liquor is colorless; freeze-drying the solid to obtain the LCC. According to the method, the LCC is separated and extracted from wood fiber prehydrolysis 'waste' solution, the prehydrolysis solution is waste in the preparation process of dissolving pulp, the LCC is directly separated and extracted, energy consumption is reduced, resource utilization rate is increased, and environmental pollution caused by 'waste' solution is relieved.

Description

technical field

[0001] The invention relates to the field of lignocellulosic extraction, in particular to a method for separating and extracting lignin-carbohydrate complex (LCC) from lignocellulosic prehydrolyzed liquid. Background technique

[0002] Lignin-carbohydrate complex (Lignin-Carbohydrate Complex, LCC) is a natural polymer composed of lignin and carbohydrates through chemical covalent bonds. LCC contains not only a hydrophobic lignin rigid block, but also a hydrophilic polysaccharide soft block, which is amphiphilic. Both polysaccharides and lignin in LCC can be biodegraded and absorbed, and participate in the metabolic cycle as an important carbon source, non-toxic and biodegradable. Lignin and polysaccharides in LCC are not simply physically stacked together, but a complex formed by benzyl ether bonds, benzyl ester bonds, acetal bonds and phenyl glycosidic bonds, which is an amorphous polymer Polymer with physical, chemical and biological stability. At the sa...