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A method for the separation and comprehensive utilization of all components of crop straw

A crop straw and full-component technology, applied in the fields of pulping with acid/acid anhydride, pulping with organic compounds, papermaking, etc., can solve the problems that the components cannot be completely separated, the purity of lignin is affected, and the cost of equipment is increased. , to achieve the effects of intensified degradation and dissolution, high recovery rate, and prevention of hydrolytic fracture

Active Publication Date: 2021-09-17
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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  • A method for the separation and comprehensive utilization of all components of crop straw
  • A method for the separation and comprehensive utilization 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 method for the separation and comprehensive utilization of all components of crop straws, which comprises the steps of cooking the crushed crop straws under the catalysis of dilute hydrochloric acid, and then separating them from the solids and liquids, and the filtrate is "liquid A ", the filter residue is washed to neutral and then dried to obtain crude cellulose; the crude cellulose is treated with hydrogen peroxide and then solid-liquid separation is carried out, the filtrate is "B liquid", the filter residue is washed to neutral and then dried to obtain cellulose; "Liquid A" and "Liquid B" were distilled under reduced pressure, mixed and the pH was adjusted, and then separated from solid and liquid. The filtrate was "Liquid C", and the precipitate was washed to neutral and then dried to obtain lignin; adjust "Liquid C" Add industrial alcohol after the pH, and then separate the solid from the liquid; wash the precipitate with water until it is neutral, and then dry it to obtain hemicellulose. The invention can successfully separate the three components of cellulose, hemicellulose and lignin in the straw, and the three components have a relatively high recovery rate, and truly realize the comprehensive utilization of the straw.

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 Patents(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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