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

A technology for crop straw and pretreatment is applied in the field of pulp pulping, which can solve the problems of economic benefit to be improved, waste of resources, economic benefit, cost reduction, etc., and achieves the improvement of comprehensive utilization efficiency, strong practicability of production process and low cost. Effect

Active Publication Date: 2021-11-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
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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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  • A method for preparing high-quality crop straw dissolving pulp by hydrothermal pretreatment

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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 mass fraction of 5% (w / v) sodium hydroxide solution according to the solid-to-liquid ratio of 1:5, heated to 50 ° C, extracted for 1 hour; the alkali-treated straw and mass fraction of 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,...

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 are 10% (w / v) sodium hydroxide solution according to the solid-to-liquid ratio of 1:20, heated to 90°C, and extracted for 2 hours; the alkali-treated straw and the mass fraction are 80% (w / v) 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-liqui...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(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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