Method for preparing cellulose compounds by using cottonseed hull as raw material

A cellulose and cottonseed husk technology, applied in the cotton industry, chemical industry, and agricultural fields, can solve the problems of low added value of products, insignificant economic benefits, etc., and achieve obvious economic and social benefits, low discharge of three wastes, and treatment capacity. big effect

Inactive Publication Date: 2013-05-29
TARIM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main utilization methods of cottonseed hulls are: combustion, preparation of silicon-containing compounds, preparation of building materials, feed, etc., its economic benefits are not significant, and the added value of products is low

Method used

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  • Method for preparing cellulose compounds by using cottonseed hull as raw material

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Effect test

Embodiment 1

[0024] Get 200 grams of local cottonseed hulls in Alar City, Xinjiang, pulverize with a pulverizer equipped with a 40-mesh sieve, and the pulverized matter is sieved with a 40-mesh and 60-mesh sieve, and utilizes the suede (cellulose 71.7% and semi-fiber 10.2% lignin, 18.1% lignin). Put the fleece into a beaker, add water and put it into an ultrasonic detergent to vibrate at a frequency of 20KHz for 15 minutes, the shell wrapped in the fleece sinks to the bottom of the beaker, and the upper layer suspension is sent into a high-pressure reactor and heated up , hydrolyzed at 140°C for 3 hours, the hydrolyzed solution was ultrasonically settled, the suspension was filtered and washed to obtain solid wool; the wool was added with supercritical CO 2 In the extractor, add 10% ethylene glycol extraction aid, filter and separate to obtain a small amount of lignin and suede (crude cellulose); add 1:0.5:1 nitric acid, formic acid and acetic acid solution to the suede (crude cellulose), ...

Embodiment 2

[0026] Get 200 grams of local cottonseed hulls in Alar City, Xinjiang, pulverize with a pulverizer equipped with a 40-mesh sieve, and the pulverized matter is sieved with a 40-mesh, 60-mesh, and 80-mesh sieve, and the cashmere body (cellulose 68.1% , hemicellulose 10.3%, lignin 21.6%). Put the fleece into a beaker, add water and put it into an ultrasonic detergent for vibration, frequency 25KHz, vibration for 25 minutes, the upper suspension is sent to a high-pressure reactor, heated, hydrolyzed at 160°C for 3 hours, and the hydrolyzed solution is ultrasonically settled , the suspension was filtered and washed to obtain solid fluff; the fluff was added with supercritical CO 2 In the extractor, add 10% 1,4-butanediol extraction aid, filter and separate to obtain a small amount of lignin and suede (crude cellulose); add 1:1 nitric acid and acetic acid solution to the suede (crude cellulose), Heating and reacting for 1.5 hours, filtering to obtain white cellulose, and crushing t...

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Abstract

The invention discloses a method for preparing cellulose compounds by using a cottonseed hull as a raw material, which is realized by hydrolyzing hemicellulose of cottonseed hull staple by using high-temperature and high-pressure liquid water, removing lignin through supercritical extraction, removing a small amount of impurities by using organic acid and inorganic acid and simultaneously preparing microcrystalline cellulose. The method comprises the following steps: separating a hull wrapped by cottonseed hull staple through ultrasonic treatment, and hydrolyzing hemicellulose in the cottonseed hull staple by using liquid water at high temperature and high pressure; performing supercritical CO2 extraction, and adding a right amount of assistant to remove lignin, thus obtaining coarse cellulose; and removing a small amount of impurities by using organic acid and inorganic acid, and simultaneously preparing microcrystalline cellulose, wherein the prepared cellulose can react with chloroacetic acid, sodium hydroxide, urea, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride and other reagents to be prepared into carbamate cellulose, carboxymethyl cellulose, hydroxyethyl methyl cellulose and other cellulose ether compounds. The method overcomes the defect of using a large amount of acid and alkali in the existing cottonseed hull cellulose recovery, has the advantages of quick and effective hemicellulose separation, low cellulose loss, obviously shortened separation period, low energy consumption and high cellulose product purity, and has remarkable economic benefits and social benefits.

Description

technical field [0001] The invention relates to a method for recycling cottonseed husks produced in the primary processing of cotton in agricultural cotton production areas, specifically including the fields of agriculture, cotton industry and chemical industry. Background technique [0002] China is the world's largest cotton-producing country. According to the latest data provided by the China Cotton Association, in 2010, the country's cotton planting area was 72.75 million mu, and the total cotton output was 5.97 million tons. Xinjiang is the largest cotton production base in my country, with 1,609 thousand hectares of cotton planted in 2010, accounting for 40% of the country's total cotton output and 11% of the world's total. [0003] Seed cotton is processed by a gin to remove lint to obtain cottonseed, the cottonseed is separated by a sheller, the cotton kernel is used for oil extraction, and the remaining shell is cottonseed husk, also called cotton husk. According t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/06C08B11/12C08B11/193C08B15/08C08H7/00C08B37/14
CPCY02P20/54
Inventor 田维亮葛振红
Owner TARIM UNIV
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