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Method for dissolving and extracting cellulose in bagasse

A technology of bagasse and cellulose, which is applied in fiber raw material processing, textiles and papermaking, etc., can solve problems such as environmental pollution and increase procedures, and achieve the effects of expanding the scope of use, facilitating centrifugal separation, and simple methods

Inactive Publication Date: 2010-02-17
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ionic liquids have been found to dissolve cellulose, but most of the current research is only on the dissolution of cellulose, whether it is the research on the dissolution of cellulose in straw, fir powder, corn husk, or even bagasse. It is the first pretreatment to extract the cellulose and then dissolve the cellulose
This not only increases the process, but also produces a large amount of waste liquid containing solvent, lignin and hemicellulose when removing lignin and hemicellulose with solvent, which will cause great pollution to the environment.

Method used

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  • Method for dissolving and extracting cellulose in bagasse

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Pass 80 mesh sieves after bagasse is pulverized (as untreated bagasse, measure its infrared spectrogram and see figure 1 Curve a), soak in water for 2 hours, filter, activate with 1% sodium hydroxide solution by mass percentage for 10 hours, rinse with deionized water to pH 7, filter, and vacuum dry at 60°C for 8 hours to obtain pretreated bagasse (as the bagasse after activation, measure its infrared spectrogram and see figure 1 curve b);

[0024] (2) Add 4.5 g of ionic liquid 1-butyl-3-methylimidazolium chloride salt to 0.5 g of the pretreated bagasse obtained in step (1), heat the temperature to 80 ° C, keep warm for 3 minutes, and add 0.11mol pyridine; Under 80 ℃, carry out dissolving reaction 90min, adopt the rotating speed centrifugation of 4000r / min 8min, obtain cellulose solution; Measure the dissolving rate of bagasse to be 48% (determine the infrared spectrogram of undissolved bagasse residue see figure 1 curve d);

[0025] (3) Add the cellulose solutio...

Embodiment 2

[0028] (1) Bagasse is crushed and passed through an 80-mesh sieve, soaked in water for 1 hour, filtered, activated with 20% sodium hydroxide solution for 5 hours, rinsed with deionized water to pH 7, filtered, and vacuum-dried at 100°C After 12h, obtain the bagasse of pretreatment;

[0029] (2) Add 19 g of ionic liquid 1-butyl-3-methylimidazolium chloride salt to 1 g of the pretreated bagasse obtained in step (1), heat the temperature to 80 ° C, keep warm for 2 min, and add 0.33 mol of it while stirring Pyridine pyridine; the dissolution reaction was carried out at 70°C for 30 minutes, and centrifuged at a speed of 2000r / min for 10 minutes to obtain a cellulose solution; the dissolution rate of bagasse was measured to be 40%;

[0030] (3) Add the cellulose solution obtained in step (2) into deionized water, stir for 120 minutes, and then filter to obtain a filter residue; wash the filter residue twice with deionized water, and dry at 100° C. for 6 hours to obtain regenerated c...

Embodiment 3

[0032] (1) Bagasse is crushed and passed through a 60-mesh sieve, soaked in water for 4 hours, filtered, activated with 15% sodium hydroxide solution for 24 hours, rinsed with deionized water to pH 7, filtered, and vacuum-dried at 80°C After 10h, the pretreated bagasse was obtained;

[0033] (2) Add 10 g of ionic liquid 1-butyl-3-methylimidazolium chloride salt to 1 g of the pretreated bagasse obtained in step (1), heat the temperature to 80° C., and keep it warm for 4 minutes, then add 0.23 mol of it while stirring Pyridine; the dissolution reaction was carried out at 100°C for 240 minutes, and centrifuged at a speed of 3000r / min for 5 minutes to obtain a cellulose solution; the dissolution rate of bagasse was measured to be 44%;

[0034] (3) Add the cellulose solution obtained in step (2) into deionized water, stir for 100 min, and then filter to obtain a filter residue; wash the filter residue with deionized water for 5 times, and dry at 80°C for 10 hours to obtain regenera...

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Abstract

The invention discloses a method for dissolving and extracting cellulose in bagasse. The method comprises the following steps: (1) soaking bagasse with water, filtrating, using sodium hydroxide solution to activate, washing with deionized water to ensure the pH value to be 7, filtrating, drying, grinding; (2) adding ionic liquid 1-butyl-3-methylimidazolium chloride in the pretreated bagasse, heating to 80 DEG C, keeping temperature for 2-5min, adding pyridine while stirring, performing dissolution reaction at 70-100 DEG C for 30-240min, centrifugalizing to obtain cellulose solution; (3) addingthe obtained cellulose solution in deionized water, stirring, filtrating to obtain filter residue, washing the filter residue with deionized water and drying to obtain regenerated cellulose. The method of the invention is easy, the process is convenient, energy-saving and environmentally friendly, and the method greatly expands the reuse of agricultural wastes and the range of application of cellulose, thus having broad application prospect.

Description

technical field [0001] The invention belongs to the field of reutilization of agricultural product waste, in particular to a method for dissolving and extracting cellulose in bagasse by using ionic liquid. Background technique [0002] As a kind of agricultural waste, bagasse is produced around 29.7 million tons in the world every year, and 20.4 million tons in China. How to deal with and effectively utilize such a large amount of bagasse is a social and environmental problem that cannot be ignored. At present, bagasse is mostly used for burning and raising livestock, and the utilization rate is very low. [0003] Bagasse is rich in cellulose. As a natural polymer material, cellulose is not only widely used in textile and papermaking, but also used to make rayon, cellophane, and ester derivatives such as nitrate and acetate; it can also be made into methyl cellulose, ethyl cellulose, etc. Ether derivatives such as base cellulose, carboxymethyl cellulose, and polyanionic c...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 庞浩石锦志廖兵陈永计红果付铁柱
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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