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Separation and comprehensive utilization method of all components of crop straw

A crop straw and full-component technology, which is applied in pulping with organic compounds, pulping with acid/acid anhydride, textiles and papermaking, etc., can solve the problem of incomplete separation of components, affecting the purity of lignin, and increasing equipment costs and other problems, to achieve the effect of intensifying degradation and dissolution, high recovery rate, and preventing hydrolytic fracture

Active Publication Date: 2019-09-17
河南省高新技术实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still serious defects or deficiencies in the separation technology of straw: each component in the straw cannot be completely separated, resulting in a waste of raw materials; although some separation methods in the prior art can separate the three components, the separation test used Chemical reagents that are corrosive to the instrument are used, or the cost of equipment is increased due to the use of corrosion-resistant or high-pressure-resistant equipment; at the same time, most separation methods need to introduce organic additives, which inevitably makes the subsequent lignin contain organic reagents. Affect lignin purity

Method used

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  • Separation and comprehensive utilization method of all components of crop straw
  • Separation and comprehensive utilization method of all components of crop straw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] After crushing the corn stalks, sieve them with 40 meshes, wash them for later use, weigh 1000.0 g of the washed corn stalks, and cook the above-mentioned raw material stalks with a mixture of formic acid, acetic acid and water under the catalytic action of 0.1 mol / L dilute hydrochloric acid, wherein The volume ratio of formic acid, acetic acid and water is 30:60:10, the cooking temperature is controlled at 90°C, the solid-liquid mass ratio is 1:20, and the reaction time is 4h; after the reaction, the solid-liquid separation of the reaction liquid, the filtrate is collected as "A Liquid", the solid filter residue was washed with water until neutral, and dried at 60°C to obtain 445.0 g of crude cellulose.

[0048] The above crude cellulose is then treated with alkaline hydrogen peroxide. Wherein, the mass fraction of hydrogen peroxide solution is 5%, the pH of the control solution is 12, and the reaction is carried out at 60° C. for 3 hours, and the solid-liquid mass rat...

Embodiment 2

[0053] After crushing the corn stalks, sieve them with 40 meshes, wash them for later use, weigh 1000.0 g of the cleaned corn stalks, and cook the above-mentioned raw material stalks with a mixture of formic acid, acetic acid and water under the catalytic action of 0.2 mol / L dilute hydrochloric acid, wherein The volume ratio of formic acid, acetic acid and water is 30:60:10, the cooking temperature is controlled at 90°C, the solid-liquid mass ratio is 1:20, and the reaction time is 4h; after the reaction, the solid-liquid separation of the reaction liquid, the filtrate is collected as "A Liquid", the solid filter residue was washed with water until neutral, and dried at 60°C to obtain 463.0 g of crude cellulose.

[0054] The above crude cellulose is then treated with alkaline hydrogen peroxide. Among them, the mass fraction of hydrogen peroxide solution is 3%, the pH of the control solution is 12, and the reaction is carried out at 60° C. for 3 hours, and the mass ratio of sol...

Embodiment 3

[0059] After crushing the corn stalks, sieve them with 40 meshes, wash them for later use, weigh 1000.0 g of the washed corn stalks, and cook the above-mentioned raw material stalks with a mixture of formic acid, acetic acid and water under the catalytic action of 0.1 mol / L dilute hydrochloric acid, wherein The volume ratio of formic acid, acetic acid and water is 20:60:20, the cooking temperature is controlled at 90°C, the solid-liquid mass ratio is 1:20, and the reaction time is 4h; after the reaction, the solid-liquid separation of the reaction liquid, the filtrate is collected as "A Liquid", the solid filter residue was washed with water until neutral, and dried at 60°C to obtain 450.0 g of crude cellulose.

[0060] The above crude cellulose is then treated with alkaline hydrogen peroxide. Wherein, the mass fraction of hydrogen peroxide solution is 5%, the control solution pH=10, react at 60°C for 3 hours, and the solid-liquid mass ratio is 1:30; after the reaction, the so...

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Abstract

The invention provides a separation and comprehensive utilization method of all components of crop straw. The separation and comprehensive utilization method of all the components of the crop straw comprises the steps of cooking crushed crop straw under the catalytic action of diluted hydrochloric acid by means of organic acid liquid, then conducting solid-liquid separation to obtain filter liquor, namely A liquid, washing filter residues with water until the filter residues are neutral, and then conducting drying to obtain crude cellulose; after the crude cellulose is treated by hydrogen peroxide, conducting solid-liquid separation to obtain filter liquor, namely B liquid, washing filter residues with water until the filter residues are neutral, and then conducting drying to obtain cellulose; conducting reduced pressure distillation on the A liquid and the B liquid separately, mixing obtained distilled products, after a pH is adjusted, conducting solid-liquid separation to obtain filter liquor, namely C liquid, washing sediment with water until the sediment is neutral, and then conducting drying to obtain lignin; adjusting a pH of the C liquid, then adding industrial alcohol, and then conducting solid-liquid separation; and washing sediment with water until the sediment is neutral, and then conducting drying to obtain hemicellulose. By means of the separation and comprehensive utilization method of all the components of the crop straw, the three components of the cellulose, the hemicellulose and the lignin in the straw can be successfully separated, and the recovery rates of the three components are high, so that comprehensive utilization of the straw is truly achieved.

Description

technical field [0001] The invention belongs to the technical field of crop straw utilization, and in particular relates to a method for separating and comprehensively utilizing all components of crop straw. Background technique [0002] my country is a large agricultural country. Except for some of the various straws produced every year for returning to the field and animal husbandry, most of them are burned or rotted on the spot, which not only wastes resources, but also causes environmental pollution such as smog. If we can fully and efficiently utilize this abundant renewable resource and convert straw into or derive products with higher added value, it will not only solve the waste of straw resources, but also play an important role in promoting the sustainable development of my country's economy. Cellulose, hemicellulose and lignin are the main components of straw, and the three components are closely intertwined and difficult to separate. Therefore, the key to convert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C3/04D21C3/22C08B37/14C08H7/00
CPCC08B37/0003C08H6/00D21C3/003D21C3/006D21C3/222D21C5/00
Inventor 赵绘婷刘振任秋鹤王品胜谢梅竹王鹏晓马磊方玉美赫玲玲程顺利卫军华张丽娟张卫峰
Owner 河南省高新技术实业有限公司
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