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Carboxyl functionalized ionic liquid solution pretreatment method for lignocellulose

A carboxyl-functionalized, lignocellulose technology, applied in the production of bulk chemicals, fermentation, etc., can solve the problems of high regeneration cost and high price of ionic liquid, and achieve the effect of mild separation, low cost and mild pretreatment conditions

Active Publication Date: 2016-12-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] There are many literatures and patents on the use of pure ionic liquids to pretreat lignocellulosic materials, but the price of ionic liquids is relatively high, and the cost of separation and purification is relatively high.

Method used

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  • Carboxyl functionalized ionic liquid solution pretreatment method for lignocellulose
  • Carboxyl functionalized ionic liquid solution pretreatment method for lignocellulose
  • Carboxyl functionalized ionic liquid solution pretreatment method for lignocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Put 3g of corn stalk or spruce thermomechanical pulp, 12g of 1-methyl-3-carboxymethylimidazolium chloride salt, 18g of water into a 100ml round bottom flask, install a condensing device, heat and stir at 120°C for pretreatment After 12 or 24 hours, cool down to room temperature, filter, and collect the filtrate for recycling. The filter residue is washed with 100 ml of water to remove the solid matter separated by filtration, and the residual ionic liquid is removed. After the solid sample is dried, it is ready to use. For the convenience of comparison, the main component contents of original corn straw and spruce thermomechanical pulp are shown in Table 1. After the cellulose-rich sample is dried, the component analysis structure is shown in Table 1. The filtrate was concentrated to 30g and directly recycled.

[0076] Table 1 Composition of raw materials without pretreatment

[0077]

[0078] Table 2 Composition of raw materials after pretreatment under different...

Embodiment 2

[0082] Add 3g of corn stalks, 6g of 1-methyl-3-carboxymethylimidazolium chloride salt, and 24g of ethanol into a 100ml autoclave, cover the autoclave, heat and stir at 120°C for 24h, and then cool down to room temperature. The reactor was opened, filtered, and the filtrate was collected for recycling, and the filter residue (cellulose-rich sample) was washed with 200 ml of water to remove residual ionic liquid. For convenience of comparison, the composition analysis structures of the original corn stalks and pretreated corn stalks (cellulose-rich samples) are shown in Table 3 after drying. Rotary evaporation to remove ethanol, recycling, adding 50ml of water to the system, the separated lignin precipitated, separated by filtration, washed to remove the ionic liquid, dried for later use. After the water was removed by rotary evaporation, the ionic liquid was recrystallized from methanol-ethyl acetate to realize the purification and recycling of the ionic liquid. NMR analysis s...

Embodiment 3

[0087] The drying of biomass raw materials is a very energy-consuming process, and this patent has good tolerance to water. We illustrate the wet biomass material claimed in the present invention by using corn stover with a moisture content of up to 20 wt % as raw material. details as follows:

[0088] The corn stalks are crushed before use, and the moisture content is 20.4wt%. Weigh 10g of corn stalks, 3g of 1-methyl-3-carboxymethylimidazolium chloride, 27g of butanol, add them into a 100ml autoclave, cover the autoclave, heat and stir at 160°C for 0.5 hour pretreatment, drop To room temperature, open the reaction kettle, filter, collect the filtrate for recycling, and wash the filter residue (cellulose-rich sample) with 300 ml of water to remove residual ionic liquid. After the cellulose-rich sample is dried, the component analysis structure is shown in Table 4. Rotary evaporation removes butanol, recycles it, adds 50ml of water to the system, and the separated lignin pre...

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Abstract

The invention provides a method for performing green efficient hydrolysis pretreatment on lignocellulose biomasses. The method comprises the steps of performing pretreatment on a lignocellulose biomass in a reaction kettle at a certain temperature by adopting a mixed solution containing carboxyl functionalized ionic liquid and a solvent; selectively hydrolyzing hemicellulose in a raw material to realize separation of cellulose, hemicellulose and lignin in the lignocellulose raw material to finish the pretreatment process and improve the enzymolysis efficiency. A solid phase separated and cleaned to obtain a component rich in cellulose and lignin; the ionic liquid can be recycled. According to the method disclosed by the invention, a solution of the carboxyl functionalized ionic liquid is used as a pretreatment medium, the selective hydrolysis efficiency of the hemicellulose in the lignocellulose biomass is high, the separation of the cellulose and the lignin is relatively thorough, the enzymatic saccharification efficiency of a sample rich in cellulose is high, and the aims of environmental protection, efficient separation of components of lignocellulose and efficient preparation of low-cost fermentable sugar solution from a lignocellulose material are achieved.

Description

technical field [0001] The invention relates to the technical fields of biochemistry and chemical industry, and specifically relates to a method of pretreating lignocellulosic biomass with a carboxyl-functionalized ionic liquid solution to selectively hydrolyze hemicellulose so as to achieve the purpose of separating and activating cellulose. Background technique [0002] With the depletion of fossil resources and a series of environmental problems caused by the use of fossil resources, it is imminent to develop a new type of renewable energy. As the main component of crops and forestry residues, lignocellulosic biomass is a renewable biomass resource on the earth. my country is a large agricultural country. The national crop straw output is about 600 million tons per year, of which about 300 million tons of cellulose can be collected and used per year. Directly using it for incineration to produce heat not only causes environmental pollution, but also cannot be used effici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P19/14C12P19/02C08H7/00
CPCY02P20/54
Inventor 谢海波赵宗保张迎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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