Method for extracting xylose and lignin from wheat straw through vapor explosion and making wood pulp

Abstract

The invention belongs to the field of comprehensive utilization of vapor explosion wheat straw and particularly relates to a method for extracting xylose and lignin from wheat straw through vapor explosion and making wood pulp. The method comprises the following steps: cutting wheat straws into fragments, fracturing, and removing dust with eight rollers so as to remove impurities and dust; furthercarrying out counter flow washing with hot water in a spiral straw washing machine; squeezing off water from the wheat straw washed with the hot water by using a single spiral squeezer, and carryingout instantaneous explosion ejection by using an instantaneous explosion ejector so as to obtain an explosion ejection material rich in xylose; blending the explosion ejection material rich in xylose,and pulping to sufficiently dissolve the xylose; carrying out counter flow extraction on the grinded pulp in an extractor, squeezing the pulp after the xylose is extracted, further carrying out air flow drying, adding ethanol and NaOH, and extracting lignin in a transverse tube type reactor. The method has creative processes, the purpose of zero emission is achieved while the xylose and the lignin are produced, the environment is protected, the economic benefits and the social benefits are increased, and the extracted xylose can be applied to textile spinning and paper making.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of steam-exploded wheat straw, in particular to a method for extracting xylose and lignin from steam-exploded wheat straw and producing pulp. Background technique [0002] As we all know, wheat straw is the agricultural residue of wheat, the main grain crop in northern my country, and is an abundant raw material for papermaking. However, the traditional pulping process has caused serious environmental pollution. The main reason is that the use of papermaking raw materials is unreasonable. In particular, pulping in my country uses straw as raw material, of which half of the non-cellulose raw materials and all chemical raw materials are discharged as waste. It is difficult to control and cause environmental pollution. The non-cellulose part of the raw material is not fully utilized and is wasted. The main components in straw are cellulose, lignin, and hemicellulose (polypentose). Studies h...

AI Technical Summary

Problems solved by technology

Xylitol is a normal intermediate of carbohydrate metabolism in the human body. It also exists widely in nature, especially in vegetables, fruits, mushrooms and other plants, but the content is low. It is expensive to extract xylitol directly from natural products. Therefore, domestic The production methods of foreign commercial xylitol all use xylan-containing plant raw materials, such as corncobs, bagasse, birch, etc. The northern production plants are mainly concentrated in Shandong Province, using corncobs as raw materials, so corncob raw materials Shortage, long-distance transport from other provinces

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