A method for preparing high-quality crop straw dissolving pulp by hydrothermal pretreatment

Abstract

The invention discloses a method for preparing high-quality crop straw dissolving pulp through hydrothermal pretreatment. The basic steps are as follows: the crushed straw is screened to obtain long-fiber raw materials; the screened long-fiber raw materials are soaked in hot water to remove non-structural components; water-insoluble straw is extracted with alkali after hydrothermal pretreatment; Straw is bleached with sodium chlorite acidic solution after extracting lignin with high-boiling alcohol; the bleached samples are fully washed and then made into pulp boards to obtain straw dissolving pulp products. The invention has the advantages of simple and easy operation process, high-quality crop straw dissolving pulp produced at low cost, effective separation and utilization of three major components in the straw, and strong practicability of the production process, which has good potential for industrial application.

Description

technical field

[0001] The invention relates to the technical field of pulping, in particular to a method for preparing high-quality crop straw dissolving pulp through hydrothermal pretreatment. Background technique

[0002] As one of the most representative lignocellulosic raw materials, the annual output of crop straw is as high as 687 million tons, which is huge and cheap. Usually, the harvested crop stalks are directly discarded or burned on the spot, which wastes resources and pollutes the environment. Crop straw is a huge biomass resource that has not been fully developed and utilized, and it is of potential value to study the technology of its transformation and utilization to produce downstream products. At present, the pulp raw materials used to produce cellulose viscose fibers are mainly wood or cotton linters. However, with the decreasing forest resources and the increasing demand for textile cotton, wood or cotton linters are used as raw materials for producing ...

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