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A method for preparing dissolving pulp by steam explosion prehydrolysis sulfate method of crop straw

A technology of crop straw and sulfate method, which is applied in the direction of pulping with inorganic alkali, non-woody plant/crop pulp, pulp bleaching, etc., can solve the problems of short and non-uniformity of straw fibers, high ash content, and low fiber content. , to achieve the effect of reducing the amount of alkali used, reducing the impact of ash, and improving quality

Inactive Publication Date: 2011-12-07
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problems of short and small fibers and outstanding unevenness of crop straw; less fiber content, more miscellaneous cells; Lignin, and a comprehensive treatment process that separates high-quality long fibers from short fibers by mechanical carding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Crush the corn stalks to 3-5cm, sort and remove the leaves and ears, and burn them through a biomass boiler to provide heat; soak the corn stalks in a dilute acid solution for 60 minutes, and adjust its water content to 50%; Put the corn stalks into the steam explosion tank, and carry out steam explosion under 1.7MPa pressure for 7 minutes; the material after steam explosion is washed with three-stage countercurrent water to wash away the hemifiber degradation products, lignin degradation products and dissolved inorganic salt ions to obtain clean materials; Clean materials are separated by mechanical carding to separate long fibers from short fibers; long fibers are cooked and pulped by kraft method, wherein the amount of alkali used is 10% (calculated as NaOH), the degree of vulcanization is 10%, and the liquid ratio is 1:8. The cooking temperature is 160°C, and the cooking time is 2 hours; the pH value of the cooking black liquor is adjusted to 2, the lignin is precipi...

Embodiment 2

[0041] Crush the straw to 3-5cm, sort and remove the leaves and ears, and burn it through a biomass boiler for heating; soak the straw with dilute acid solution for 40mm, and adjust its water content to 40%; put the straw into Steam explosion tank, 1.6MPa dimension pressure 10mm for steam explosion; the material after steam explosion is subjected to three-stage countercurrent washing to wash away semi-fiber degradation products, lignin degradation products and dissolved inorganic salt ions to obtain clean materials; clean materials are passed through mechanical Combing, separating long fibers from short fibers; long fibers are cooked and pulped by kraft method, wherein the amount of alkali used is 10% (calculated as NaOH), the degree of vulcanization is 10%, the liquid ratio is 1:8, and the cooking temperature is 160°C , the cooking time is 2h; after the black liquid film is graded by cooking, the pH is adjusted to be acidic, the lignin is precipitated, and the lignin is washed...

Embodiment 3

[0043] Crush the straw to 3-5cm, sort and remove the leaves and ears, and burn it through a biomass boiler to provide heat; soak the straw in a dilute acid solution for 40mm, and adjust its water content to 40%; pack the straw after humidity adjustment Into the steam explosion tank, 1.6MPa dimension pressure 5mm for steam explosion; the material after the steam explosion is subjected to three-stage countercurrent washing to wash away the hemifiber degradation products, lignin degradation products and dissolved inorganic salt ions to obtain clean materials; the clean materials pass through Mechanical carding, long fibers and short fibers are separated; long fibers are cooked and pulped by kraft method, wherein the amount of alkali used is 10% (calculated as NaOH), the degree of vulcanization is 10%, the liquid ratio is 1:8, and the cooking temperature is 160 ℃, the cooking time is 2h; after the black liquor film is graded, the pH is adjusted to be acidic, the lignin is precipita...

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Abstract

The invention discloses a method for preparing dissolving pulp by carrying out steam explosion on crop straw and adopting a prehydrolytic sulfate process. The method has the following advantages: steam explosion and washing are adopted to remove about 80% of hemicellulose, 10% of lignin and 72% of inorganic salt in advance and the excellent long fibers and the short fibers are separated through mechanical carding, thus solving the problems of short fibers of the crop straw, prominent non-uniformity and high ash content; the excellent long fibers obtained through separation are cooked by a sulfate process; the prepared dissolving pulp has excellent performances and can replace wood pulp, thus widening the application range of the dissolving pulp; at the same time, the washing solution obtained after steam explosion and washing and the fine fibers obtained through carding and screening are directly used for fermenting biogases; the cooking black liquor undergoes acid precipitation and washing to prepare high-purity lignin; and the excellent long fibers of the crop straw are used for preparing the dissolving pulp and the fine fibers, the hemicellulose and the lignin are simultaneously effectively separated and utilized, thus realizing comprehensive utilization of the straw resources, being beneficial to reduction of the production cost and realizing industrialized application.

Description

technical field [0001] The present invention relates to the technical field of preparation of pulp for viscose fiber, and more particularly relates to a method for preparing pulp for viscose fiber from crop stalks (corn stalks, rice straw, wheat straw, etc.), and the by-products can be used to ferment biogas, Preparation of lignin etc. Background technique [0002] Viscose fiber has good moisture absorption and air permeability, soft texture, smooth fabric, comfortable to wear, and bright and beautiful colors. With the improvement of people's living standards, people's requirements for clothing have shifted from synthetic fibers to plant fibers, and viscose fibers have become the new favorite in the textile market. However, the raw material development process of cellulose fiber is slow, and the raw materials used for production are relatively single. At present, the main raw materials suitable for viscose fiber and solvent-process cellulose fiber are wood pulp and cotton p...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21B1/02D21B1/36D21C1/00D21C3/02D21C9/02D21D5/02D21C9/16
Inventor 陈洪章王宁
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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