Efficient separating purifying technique for lignin, hemi-cellulose and cellulose

Abstract

The invention relates to an efficient separating purifying technique for lignin, hemi-cellulose and cellulose and belongs to the technical field of biomass separation and purification. The efficient separating purifying technique is adopted for solving the problem that the biomass separation and purification method in the prior art cannot fully extract lignin, hemi-cellulose and cellulose. The separating purifying technique provided by the invention comprises the following steps: adopting NaOH solution for performing alkali extraction in advance on the biomass containing lignin, hemi-cellulose and cellulose and performing spiral shoving, thereby obtaining an alkali extraction solution and the biomass after alkali extraction; separating and concentrating the alkali extraction solution through a nano-filtration membrane, and then performing acid hydrolysis and centrifugal separation, thereby obtaining lignin, xylose and a nano-filtration penetrating solution containing NaOH; performing hot alkali extraction and spiral shoving on the biomass after the alkali extraction in advance, thereby obtaining cellulose and alkali extracting solution; separating and concentrating the alkali extracting solution through the nano-filtration membrane, thereby obtaining the nano-filtration concentrated solution containing lignin and the nano-filtration penetrating solution containing NaOH. According to the technique, lignin, hemi-cellulose and cellulose in the raw materials are fully separated; the technique is environment-friendly; the alkali recovery rate is high; the energy consumption of production is low.

Description

technical field

[0001] The invention relates to a high-efficiency separation and purification process of lignin, hemicellulose and cellulose, and belongs to the technical field of biomass separation and purification. Background technique

[0002] Biomass mainly refers to lignocellulose such as straws and trees other than grains and fruits in the process of agricultural and forestry production, scraps of agricultural products processing industry, agricultural and forestry wastes, and livestock manure and waste in the production process of animal husbandry. These biomasses are widely distributed, and if they can be reused, they will have great economic and social benefits.

[0003] Crop straw is an important biological resource obtained in the process of crop production. About 2 billion tons of crop straw can be produced every year in the world. China is a big agricultural country and one of the countries with the most abundant crop straw resources, producing more than 600 mi...

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