Preparing method of straw type fibre spinning solution

A spinning dope and fiber-like technology, which is applied in the field of preparation of straw-like cellulose spinning dope, can solve the problems of long cycle, many by-products, environmental pollution, etc., and achieve large industrial application value, high added value and full utilization, The effect of reducing energy consumption

Inactive Publication Date: 2007-05-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical method can improve the saccharification rate of the processed raw materials, but the energy consumption is high and the cost is high; the separation effect of the acid, alkali and organic solvent treatment method is better, but there are relatively many by-products, and most of the conditions are harsh, and improper treatment will cause environmental pollution. Pollution; the conditions of the biological method are mild, and the reaction conditions are easy to control, but the cycle is long and the efficiency is low, and there is still a certain distance from industrial application

Method used

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The preparation of embodiment 1 wheat straw cellulose spinning dope:

[0015] Soak the wheat straw in water to make the water content to 35%, then put it into the steam explosion device, pass the saturated steam to reach the pressure of 1.5MPa, maintain the pressure for 10min, release the pressure suddenly, take it out and use 85℃ hot water to continuously elute half Cellulose; at 140°C, extract the lignin in the residue with 60% ethanol aqueous solution (extraction for 3 hours), filter and separate to obtain the filtrate and cellulose filter residue containing the lignin alcohol solution; then refine the cellulose filter residue residue, Pass through a 40-mesh sieve to remove short fibers, and finally pass through two stages of H 2 o 2 Bleaching (75°C, 2h) to obtain wheat straw pulp. After analysis, the cellulose content of wheat straw pulp is 95%, the α-cellulose is 91%, the degree of polymerization is 510, and the ash content is 0.8%. Alkali-activated wheat straw ...

Embodiment 2

[0017] The preparation of embodiment 2 emperor bamboo grass cellulose spinning dope:

[0018] First of all, separate the skin and flesh of the imperial bamboo grass, soak the separated skin part in water for 12 hours, take it out and adjust the water content to 30%, put it into the steam explosion device, pass the saturated steam to reach the pressure of 2.0MPa, maintain the pressure for 1min, and suddenly Release the pressure, take out 75°C continuous countercurrent water to elute the sugar; extract the residue with 50% ethanol aqueous solution at 180°C for 2 hours, take out the eluted lignin and then refine the remaining residue, pass through a 40-mesh sieve to remove short fibers, and finally pass through two Section H 2 o 2 Bleaching (75°C, 2h) to obtain Huangzhu grass pulp. After analysis, the cellulose content of Huangzhu grass pulp is 96%, α-cellulose is 93%, the degree of polymerization is 640, and the ash content is about 0.7%. Alkali-activated Huangzhu grass pulp ...

Embodiment 3

[0020] The preparation of embodiment 3 corn stalk cellulose spinning dope:

[0021] First, separate the husks from the corn, soak the separated husks in water for 6 hours, take them out and adjust the water content to 33%, put them into a steam explosion device, pass saturated steam to a pressure of 1.8MPa, maintain the pressure for 4 minutes, and release the pressure suddenly After taking it out, hemicellulose was continuously eluted with 60°C hot water in countercurrent; the residue was extracted with 40% ethanol aqueous solution at 200°C for 2 hours, after the lignin was taken out and eluted, the remaining residue was refined, passed through a 40-mesh sieve to remove short fibers, Finally, through two paragraphs of H 2 o 2 Bleaching (75°C, 2h) to obtain corn bran fiber. After analysis, the cellulose content of corn hull fiber is 94%, α-cellulose is 90%, the degree of polymerization is 550, and the ash content is about 0.9%. Alkali-activated corn cellulose and urea (mass ...

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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Abstract

A process for preparing the spinning dope from the fibrous straw and stalk includes such steps as steam exploding, cyclic countercurrent extracting in water to remove the most of soluble hemicellulose, extracting lignin in the aqueous solution of alcohol, filtering to obtain the alcohol solution of lignin and coarse cellulose, grinding, removing short fibers, bleaching to obtain milk, mixing it with urea, reacting in inertial solvent to obtain cellulose aminoformate, and dissolving it in NaOH solution.

Description

technical field [0001] The invention belongs to the technical field of straw processing, and in particular relates to a method for preparing straw-like fibrous spinning stock solution. Background technique [0002] At present, the fiber raw materials for spinning are generally extracted from cotton linters or wood, and are mainly produced by dilute hydrochloric acid pretreatment to remove lipids, sugars and proteins, and then cook with alkali or sulfite to remove lignin; this method exists There are problems such as high raw material and production costs, easy corrosion of equipment, and serious pollution. my country is a country that lacks forest resources, with a forest coverage rate of only 18.21%, and the per capita forest area ranks 121st in the world. Therefore, it is very important to find alternatives to spinning fiber raw materials and cleaner and more efficient production processes. [0003] Straw-based biomass raw materials contain a large amount of fiber compon...

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/00
Inventor 陈洪章翟蔚
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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