Pulping method for plant fibre raw material combined with biology

Abstract

A method of making refined plant fiber raw material pulping combined with biomass is to extract sugar material such as hemicelluloses by water extractives before digesting pulping by plant fiber raw material or processing wastes of plant fiber raw material. When the products of extraction are separated, the liquid part are used for producing fuel ethanol and / or other products by adopting a biotransformation process or a chemical transformation process; the extraction residue can be made into paper pulp by conventional method or used for extracting lignin or processed into fertilizer. By adopting method of the invention, the extracted sugar material such as hemicelluloses can be recycled. When the solid residue left after extraction is used for making pulp by a traditional chemical method, the black liquid pollution can be alleviated and the treatment load of alkali recovery can be reduced; when the solid residue is used for making pulp by organic solvent method, the proportion of sugar material such as hemicelluloses degraded in the cooking residual liquid can be greatly reduced and the difficulty of separation of sugar material and organic solvent in the cooking residual liquid can be reduced, at the same time, by products---lignin can be obtained.

Description

technical field [0001] The invention belongs to the technical field of the pulping method of plant fiber raw materials combined with biological refining. Background technique [0002] With the increasingly serious problems of energy, resources and environment, biorefinery has become the strategic research direction of countries all over the world. The National Committee of the United States predicts that by 2020, 50% of organic chemicals and materials will be produced from biomass raw materials, and the period from 2000 to 2020 will be a critical period for all countries in the world to vigorously develop biomass energy. It is estimated that by 2010 my country's biomass energy utilization will account for 1% of the total primary energy consumption, and by 2020 it will reach 4%. However, since countries around the world have gradually adjusted their policies to reduce or prohibit the conversion of food (starch) into fuel ethanol, the technology of producing cellulosic ethano...

AI Technical Summary

Problems solved by technology

Although these technical solutions have many positive effects, the biggest problem encountered in directly extracting lignin and cellulose with high-boiling alcohol from plant fiber raw materials is that most of the hemicellulose sugars in the raw materials are degraded and dissolved in the cooking raffinate , making it difficult to separate products such as lignin, alcohol, and dissolved sugars

[0008] (1) In the traditional chemical pulping and high-yield pulping process of plant fiber raw materials, there is no pretreatment process for extracting sugars such as hemicellulose from raw materials. This part of sugars is dissolved in waste liquid The lignin in it is basically burned together, and its utilization value is low, resulting in a great waste of resources and environmental pollution;

[0009] (2) The existing organic solvent pulping process does not have a pretreatment process for extracting sugars such as hemicellulose

This part of sugars and lignin are dissolved in the organic solvent residue after cooking. In addition to causing waste of hemicellulose polysaccharide resources and failing to realize the full separation and comprehensive utilization of biomass components, it also increases the amount of sugar and organic solvents. The separation difficulty seriously affects the recycling of organic solvents and the industrialization of organic solvent pulping

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