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Choline Ionic Liquid and Its Application in Wheat Straw Pretreatment

A technology of choline ion and wheat straw, applied in the production of bulk chemicals, organic chemistry, fermentation, etc., can solve the problems affecting the economic feasibility of the pretreatment process, unsatisfactory thermal stability, harsh process conditions, etc., and achieve excellent water resistance High stability, high thermal stability, and the effect of simplifying the process

Inactive Publication Date: 2017-05-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process conditions for dissolving lignocellulose or cellulose are relatively harsh, and the dissolving process requires a very high water content in the system (usually less than 1%), which requires long-term high-temperature treatment of biomass raw materials and ionic liquids. Dehydration treatment leads to excessive energy consumption, which seriously affects the economic feasibility of the pretreatment process (J.Am.Chem.Soc.2002,124,4974)
Although [choline][amino acid] ionic liquid is a kind of renewable and environment-friendly ionic liquid, it also shows excellent lignocellulose pretreatment effect, but its thermal stability is still not ideal (Green Chem.2012,14,304)

Method used

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  • Choline Ionic Liquid and Its Application in Wheat Straw Pretreatment
  • Choline Ionic Liquid and Its Application in Wheat Straw Pretreatment
  • Choline Ionic Liquid and Its Application in Wheat Straw Pretreatment

Examples

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Effect test

Embodiment 1

[0029] [Choline][Taurine] Pretreated Wheat Straw

[0030] a) Preparation of [choline][taurine] ionic liquid: slowly drop 45 wt% methanol solution of choline hydroxide into equimolar taurine aqueous solution at 4°C under nitrogen protection, and keep stirring. Then warmed to room temperature and stirred for 48h. After rotary evaporation at 55° C. to remove water, vacuum drying was carried out at 70° C. for 48 hours to obtain the target ionic liquid. [Choline][Taurine] H NMR spectrum such as figure 1 shown. Its thermogravimetric analysis results ( image 3 ) shows that the thermal decomposition temperature of the ionic liquid reaches 180°C, which is 150-165°C higher than the decomposition temperature of [choline][amino acid salt].

[0031] b) Pretreatment: Take 300mg of wheat straw powder (<150μm) and 6g of [choline][taurine] ionic liquid, put them together in a 15mL Erlenmeyer flask, and stir at 90°C for 6 hours under nitrogen protection; Then cool to room temperature, add...

Embodiment 2

[0034] [Choline][Levulinate] Pretreatment of Wheat Straw

[0035] a) Preparation of [choline][levulinate] ionic liquid: slowly drop 45 wt% methanol solution of choline hydroxide into equimolar levulinic acid aqueous solution at 4°C under nitrogen protection, and keep stirring. Then warmed to room temperature and stirred for 48h. After rotary evaporation at 55° C. to remove water, vacuum drying was carried out at 70° C. for 48 hours to obtain the target ionic liquid. [Choline][levulinate] H NMR spectrum such as figure 2 shown. Its thermogravimetric analysis results ( image 3 ) shows that the thermal decomposition temperature of the ionic liquid reaches 180°C, which is 150-165°C higher than the decomposition temperature of [choline][amino acid salt].

[0036] b) Pretreatment: Take 300mg of wheat straw powder (<150μm) and 6g of [choline][levulinate] ionic liquid, put them together in a 15mL Erlenmeyer flask, and stir at 90°C for 6 hours under nitrogen protection; Then cool...

Embodiment 3

[0039] [Choline][Taurine] Pretreated Wheat Straw

[0040] a) Pretreatment: Take 150 mg of wheat straw powder (<150 μm) and 3 g of [choline][taurine] ionic liquid, put them together in a 15 mL Erlenmeyer flask, and stir at 80°C for 8 hours under nitrogen protection; Then cool to room temperature, add 1 times the volume of the ionic liquid in deionized water to dilute, filter, and then wash the filter residue 5 times with 3 times the volume of deionized water, and then dry the filter residue to obtain the pretreated rice straw.

[0041] b) Enzymatic hydrolysis: Take 20 mg of the above-mentioned pretreated wheat straw, put it in a 50 mL Erlenmeyer flask, add 7 mL of citrate buffer (50 mmol / L, pH 4.8), 0.22 FPU cellulase (Celluclast 1.5 L, purchased Novozymes) and 1.0CBU β-glucosidase (Novozymes 188, purchased from Novozymes), sealed and placed in a constant temperature oscillator at 200r / min and 50°C for reaction. After 48 hours, 200 μL of the sample was taken and treated at 100...

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Abstract

The present invention discloses choline ionic liquid and an application thereof in wheat straw pretreatment. The choline ionic liquid is [choline] [taurine salt] or [choline] [levulinic acid salt]. An application method comprises the following steps: by using the choline ionic liquid as a solvent, pretreating wheat straws at a certain temperature; subsequently separating to obtain residues; drying to obtain the pretreated wheat straws; and performing enzymolysis on the pretreated wheat straws which serve as substrates by using cellulase and beta-glucosidase so as to obtain a sugar solution mainly containing reducing sugars. The choline ionic liquid provided by the present invention can be reproduced, and has higher thermostability; and the enzymolysis efficiency of the pretreated wheat straws can be effectively improved, the yield of fermentable reducing sugar can be increased, and furthermore, the shortcomings that the traditional ionic liquid pretreatment process pollutes the environment, is poor in water resistance and the like are overcome.

Description

technical field [0001] The invention belongs to the fields of lignocellulose utilization and chemical industry application, and specifically relates to a choline ionic liquid and a method for high-efficiency pretreatment of wheat straw to improve subsequent enzymatic hydrolysis efficiency of polysaccharides. Background technique [0002] In recent years, the production of bio-based energy and chemicals from biomass has received increasing attention (Science2012, 337, 695). Compared with fossil resources, biomass resources have many advantages. It is not only inexhaustible and inexhaustible, but also can effectively reduce CO 2 emissions and environmental pollution. Lignocellulose is the most widely distributed and abundant renewable biomass resource on the earth. The biomass is mainly composed of cellulose, xylan and other polysaccharides and lignin. The reducing sugar obtained after enzymatic hydrolysis of polysaccharides in it can be converted into various biofuels (suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C309/14C07C215/40C07C59/185C12P19/14
CPCC07C59/185C07C215/40C07C309/14C12P19/14Y02P20/54
Inventor 李宁任欢宗敏华
Owner SOUTH CHINA UNIV OF TECH
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