Method for preparing oligosaccharide and paper pulp

Abstract

The invention discloses a method for preparing oligosaccharide and paper pulp, belonging to the technical fields of pulping and the comprehensive utilization of pulping. The method comprises the steps of: using crop straws as raw materials, pre-treating the raw materials to obtain a pre-extracting solution, concentrating the pre-extracting solution by a membrane separation method, then obtaining a crude xylan solution via precipitation and centrifugal separation, and then preparing oligosaccharide via enzymolysis, vacuum concentration and frozen-drying. The pre-treated solid residues are stewed via an alkaline process so as to prepare unbleached paper pulps of which the indexes such as fiber length, whiteness, fracture length, tear resistance, folding strength and the like are all improved. The generated black liquid has the characters of low viscosity and high heat productivity. The method for preparing oligosaccharide and paper pulp integrates the comprehensive utilization method with the biomass transformation method on the premise of optimizing the traditional alkaline chemical pulping technique to prepare products with high additional values, namely oligosaccharide, thereby increasing the quality of the paper pulp and the extraction, vaporization and combustion performances of the black liquid.

Description

technical field

[0001] The invention relates to a method for preparing xylooligosaccharide and pulp by using crop straws, and belongs to the technical field of pulping and pulping comprehensive utilization. Background technique

[0002] With the increasing severity of energy shortage, environmental pollution and climate change, the introduction of biomass conversion in the paper industry has become an ideal choice, which will make the pulp and paper industry comprehensive utilization of fiber raw materials, product value and environmental protection, etc. raised to a new level.

[0003] The pulp and paper industry is the first industry to utilize renewable fiber resources on a large scale, and has the infrastructure and practical experience in large-scale collection, treatment, and processing of biomass resources. my country has abundant non-wood fiber resources, and crop straw is one of the most commonly used non-wood fiber raw materials in the paper industry. As agricult...

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