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

Active Publication Date: 2020-07-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Hebei Beijing Lion Grass Fiber Products Co., Ltd. disclosed "a preparation method of wheat straw man-made fiber dissolving pulp" (application number 95109738.5). After the process steps, man-made fiber dissolving pulp is obtained. Although this method broadens the range of materials used for man-made fiber dissolving pulp, it lacks the separation and comprehensive utilization of the two key components of lignin and hemicellulose in the preparation process, so While causing waste of resources, the relative economic benefits are low
Shandong Hailong Co., Ltd. disclosed the "method for preparing bleached dissolving pulp by using corn stalks" (application number 200710014649.9). A new process for cornstalk pulping, but it also determines the effective separation and comprehensive utilization of raw material components, which is not conducive to reducing costs, and the relative economic benefits need to be improved

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

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Experimental program
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Effect test

Embodiment 1

[0021] The corn stalks were air-dried, crushed, and sieved to screen out the long fiber part with a particle size of 3-5 cm; the screened long fiber stalks were mixed with hot water at a solid-to-liquid ratio of 1:15 (g / mL), soaked for 1 h, and The non-structural components in the straw were removed to obtain water-insoluble straw; then the water-insoluble straw and water were placed in a hydrothermal reactor at a solid-to-liquid ratio of 1:5, heated to 150°C, and treated for 1 hour; after hydrothermal pretreatment, the Straw and 5% (w / v) sodium hydroxide solution according to the solid-to-liquid ratio of 1:5, heated to 50°C, and extracted for 1 hour; the alkali-treated straw and 50% (w / v) 1,4-Butanediol was heated to 100°C at a solid-to-liquid ratio of 1:5, and reacted for 1 hour; the above raw materials were mixed with 1% (w / v) sodium chlorite acidic solution (adjusted to pH=3.6 with acetic acid) According to the solid-to-liquid ratio of 1:10, heat to 50°C and bleach for 1 h...

Embodiment 2

[0023] The corn stalks were air-dried, crushed, and sieved to screen out the long fiber part with a particle size of 3-5 cm; the screened long fiber stalks were mixed with hot water at a solid-to-liquid ratio of 1:15 (g / mL), soaked for 1 h, and Remove the non-structural components in the straw to obtain water-insoluble straw; then place the water-insoluble straw and water in a hydrothermal reactor at a solid-to-liquid ratio of 1:15, heat to 200°C, and treat for 0.5h; after hydrothermal pretreatment The straw with a mass fraction of 10% (w / v) sodium hydroxide solution was heated to 90°C at a solid-to-liquid ratio of 1:10, and extracted for 2 hours; the straw after alkali treatment was mixed with a mass fraction of 60% (w / v ) 1,4-butanediol according to the solid-to-liquid ratio of 1:15, heated to 150°C, and reacted for 1 hour; the above raw materials were mixed with a mass fraction of 6% (w / v) sodium chlorite acidic solution (adjusted with acetic acid to pH=3.7 ) at a solid-to-...

Embodiment 3

[0025] The corn stalks were air-dried, crushed, and sieved to screen out the long fiber part with a particle size of 3-5 cm; the screened long fiber stalks were mixed with hot water at a solid-to-liquid ratio of 1:15 (g / mL), soaked for 1 h, and The non-structural components in the straw were removed to obtain water-insoluble straw; then the water-insoluble straw and water were placed in a hydrothermal reactor at a solid-to-liquid ratio of 1:20, heated to 230°C, and treated for 2 hours; after hydrothermal pretreatment, The straw and the mass fraction of 10% (w / v) sodium hydroxide solution according to the solid-to-liquid ratio of 1:20, heated to 90 ° C, extracted for 2 hours; 1,4-Butanediol was heated to 200°C at a solid-to-liquid ratio of 1:20, and reacted for 2 hours; the above raw materials were mixed with 6% (w / v) sodium chlorite acidic solution (adjusted pH=3.8 with acetic acid) According to the solid-to-liquid ratio of 1:20, heat to 80°C, and bleach for 2 hours; the bleac...

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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.

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/06D21C3/02D21C9/10
CPCD21B1/06D21C3/02D21C9/10
Inventor 曲永水王悦海朱俊鹏王朋
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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