Method for pretreating and hydrolyzing microcrystalline cellulose

A microcrystalline cellulose and pretreatment technology, applied in the direction of fermentation, can solve the problems of high energy consumption, high price, and long time for dissolving cellulose, and achieve the effects of high energy consumption, low cost and low price

Inactive Publication Date: 2012-03-21
XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above composite solvents are expensive, take a long time to dissolve cellulose, and have high energy consumption.

Method used

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  • Method for pretreating and hydrolyzing microcrystalline cellulose

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The organic solvent is a mixture of 1,3-dimethyl-2-imidazolinone (DMI), pyrrolidinone (pyrrolidinone) and sulfolane (sulfolane), wherein the three are mixed according to a molar ratio of 1:1:1; The liquid is a mixture of 3-methyl-1-butylpyrrole chloride ([BMPL]Cl) and 1,3-dimethylimidazolium diethylphosphate ([MMIM]DEP), in which the ratio of the two is 1:2 The molar ratio was mixed, and the ionic liquid was vacuum-dried at 100°C for 36 hours before use; then the organic solvent and the ionic liquid were shaken and mixed according to the volume ratio of 1:2 to form an organic electrolyte solution. Add 5% microcrystalline cellulose to the organic electrolyte solution, heat in an oil bath at 110° C. for 30 minutes, and magnetically stir at 110° C. for 20 minutes to form a clear and transparent cellulose solution.

[0034] Add 5 times volume of water at room temperature to the cellulose solution, shake vigorously and filter to obtain filtrate and colloidal regenerated cell...

Embodiment 2

[0038] The organic solvent is a mixture of 1,3-dimethyl-2-imidazolinone (DMI), pyrrolidinone (pyrrolidinone) and sulfolane (sulfolane), wherein the three are mixed according to a molar ratio of 1:2:2; The liquid is a mixture of 3-methyl-1-butylpyrrole chloride ([BMPL]Cl) and 1,3-dimethylimidazolium diethylphosphate ([MMIM]DEP), in which the ratio of the two is 1:3 The molar ratio is mixed, and the ionic liquid is vacuum-dried at 90°C for 36 hours before use; then the organic solvent and the ionic liquid are mixed according to the volume ratio of 1:1, and the organic electrolyte solution is formed. Add 5% microcrystalline cellulose to the organic electrolyte solution, microwave the mixed solution of organic electrolyte and cellulose according to the amount of 40J / g cellulose, and use 300W, 40KHz ultrasonic vibration to form a clear and transparent cellulose solution after 0.5 minutes .

[0039] Add 5 times the volume of a mixture of 10% PEG 400 and water at room temperature to...

Embodiment 3

[0043] The organic solvent is a mixture of 1,3-dimethyl-2-imidazolinone (DMI), pyrrolidinone (pyrrolidinone) and sulfolane (sulfolane), wherein the three are mixed according to a molar ratio of 1:3:2; The liquid is a mixture of 3-methyl-1-butylpyrrole chloride ([BMPL]Cl) and 1,3-dimethylimidazolium diethylphosphate ([MMIM]DEP), in which the ratio of the two is 1:2 The molar ratio is mixed, and the ionic liquid is vacuum-dried at 95°C for 40 hours before use; then the organic solvent and the ionic liquid are mixed according to the volume ratio of 1:1, and the organic electrolyte solution is formed. Add 5% microcrystalline cellulose to the organic electrolyte solution, microwave heating at room temperature according to the radiation dose of 30 J / g-cellulose, and magnetically stir at 100 rpm for 10 minutes to form a clear and transparent cellulose solution.

[0044] Add 5 times the volume of a mixed solution of 10% ethanol and water at room temperature to the cellulose solution, ...

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Abstract

The invention aims to provide a method for dissolving and pretreating microcrystalline cellulose by an organic electrolyte in the technical field of green chemical and biomass new energy production. The method is economic and efficient, can be used for quickly dissolving the microcrystalline cellulose, and has small pollution on the environment, and the organic electrolyte can be recycled repeatedly. The initial hydrolysis rate of the treated regenerated cellulose can be raised by 5-6 times, and the 72-hour hydrolysis rate is raised by 6-8 times. The method mainly consists of four steps of organic electrolyte preparation, cellulose dissolution regeneration, cellulose hydrolysis and organic electrolyte recovery and recycling.

Description

technical field [0001] The invention belongs to the technical field of green chemistry and biomass new energy production, and specifically relates to the field of using an organic electrolyte to dissolve and pretreat cellulose biomass and the high-efficiency hydrolysis of the pretreated biomass. Background technique [0002] With the reduction of petroleum reserves and the increasing environmental pollution in recent years, the comprehensive utilization of green and renewable raw materials is a necessary means to achieve sustainable social development. Cellulose is the most abundant renewable natural polymer in nature, with an annual regeneration capacity of more than 1.0×10 10 Ton. Moreover, cellulose also has the advantages of easy degradation, no pollution, and easy modification. Cellulose and its derivatives have been widely used in traditional plastics, textiles, papermaking, oil fields, food, daily chemicals, medicine, construction and other industries. More importan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C08J3/09
Inventor 田霄飞方真
Owner XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI
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