Method for preparing high-quality crop straw dissolved pulp through hydrothermal pretreatment

A technology for crop straw and pretreatment, which is applied in the directions of pulping with inorganic alkalis, pulp bleaching, raw material separation, etc., can solve the problems of economic benefits to be improved, waste of resources, economic benefits, cost reduction, etc., so as to improve the comprehensive utilization efficiency and production efficiency. Process practicability, low cost effect
CN111472186AActive Publication Date: 2020-07-31INST OF PROCESS ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF PROCESS ENG CHINESE ACAD OF SCI
Publication Date
2020-07-31

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Abstract

The invention discloses a method for preparing high-quality crop straw dissolved pulp through hydrothermal pretreatment. The method comprises the following basic steps: screening crushed straws to obtain a long fiber raw material; soaking the screened long fiber raw material in hot water to remove non-structural components; carrying out hydrothermal pretreatment on the water-insoluble straws, thenextracting by using an alkaline method; extracting lignin from the straws subjected to alkali treatment by using high-boiling alcohol, and bleaching the straws by using a sodium chlorite acidic solution; fully washing the bleached straws, and pulping the straws by a pulping board to obtain a finished product of straw dissolved pulp. The method has the advantages that the process is simple and easy to operate, the high-quality crop straw dissolved pulp is produced at a low cost, meanwhile, three components in the straws are effectively separated and utilized, and the production process is highin practicability and has good industrial application potential.
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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 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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