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Method for pretreating lignocellulose by using ketol pretreating agent

A technology of lignocellulose and pretreatment agent, applied in pulping of cellulose raw materials, methods based on microorganisms, fiber raw material treatment, etc., can solve the problems of low efficiency of lignocellulose, a large amount of acid-base wastewater, and high equipment requirements, and achieve Promote pretreatment and saccharification degradation, high-efficiency pretreatment, and high sugar concentration

Inactive Publication Date: 2019-09-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, chemical pretreatment, such as acid-base pretreatment of lignocellulose, will produce a large amount of acid-base wastewater, causing environmental pollution; physical methods such as mechanical crushing, steam explosion, etc. have high energy consumption and require high equipment; biological methods Degradation of lignocellulose is less efficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The aqueous solution of butanol-ethanol mixture was prepared as the aqueous solution of pretreatment agent to pretreat corn stalks and then carry out enzymatic hydrolysis.

[0068] (1) The dry corn stalks are crushed to particles smaller than 60 mesh.

[0069] (2) An aqueous solution of a pretreatment agent prepared from analytically pure acetone, butanol and water, wherein the mass concentrations of acetone and butanol are 13.2% and 33.9% respectively, and the balance is water.

[0070] (3) Mix the aqueous solution of the pretreatment agent prepared in advance with the addition of 5% (w / v) corn stalks to prepare a solid-liquid mixture (slurry).

[0071] (4) Pour the slurry containing the pretreatment liquid and the corn stalk solid-liquid mixture into a high-pressure reactor to seal, and react at 160° C. and 500 rpm for 1 h.

[0072] (5) After the reaction, the solid phase was collected by centrifugation, and the solid phase was washed with deionized water until no re...

Embodiment 2

[0075] Prepare the aqueous solution of the alkaline acetone-butanol-ethanol mixture as the aqueous solution of the pretreatment agent to pretreat the sweet sorghum stalks, and then enzymatically hydrolyze and ferment to prepare acetone, butanol and ethanol.

[0076] (1) After sweet sorghum stalks are pressed to remove sugary juice, the residue is soaked in deionized water until all free sugars on the surface of the sorghum stalk residue are removed, and dried at 105°C overnight. The obtained dry residue was pulverized to a particle size of less than 80 mesh.

[0077] (2) prepare the aqueous solution of ketone alcohol pretreatment agent with ethanol, acetone and butanol, and it is mixed with alkaline solution, make alkaline pretreatment agent aqueous solution, wherein each in the aqueous solution of alkaline pretreatment agent The mass concentration of the substance is: 1% sodium hydroxide, 5% ethanol, 15% acetone, 30% butanol.

[0078] (3) The aqueous solution of the pre-prep...

Embodiment 3

[0084] The concentrated solution rich in acetone, butanol and ethanol collected by pervaporation is used as the aqueous solution of pretreatment agent and sulfuric acid mixture to make the aqueous solution of acidic pretreatment agent, combined with microwave for pretreatment, and using rice straw through simultaneous saccharification and fermentation method The pretreatment residue is used as substrate to prepare cellulosic ethanol.

[0085] (1) The rice straw is crushed to particles smaller than 60 mesh.

[0086] (2) Using the method described in patent 201210225327.X, the acetone-butanol fermentation process is coupled with the pervaporation membrane that preferentially permeates alcohol, and the fermentation concentrate rich in acetone, butanol and ethanol is obtained by in-situ separation on the permeation side of the pervaporation membrane . Among them, the mass concentrations of acetone, butanol and ethanol are 35.3%, 54% and 4.7%, respectively. The mixture was heated...

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Abstract

The invention relates to a method for pretreating lignocellulose by using a ketol pretreating agent. The method comprises the steps of step A, uniformly mixing lignocellulose raw materials with an aqueous solution of the ketol pretreating agent to prepare a solid-liquid mixture; step B, performing heat treatment on the solid-liquid mixture to prepare a pretreated mixture; and step C, cooling the pretreated mixture, and performing solid-liquid separation to obtain solid-phase pretreated cellulose dregs, wherein the ketol pretreating agent contains hydroxyl and keto. The method provided by the invention realizes high-efficiency pretreatment of cellulose by the ketol pretreating agent, cellulose and hemicellulose components can be effectively recovered, and the method is green, environmental-friendly and high in efficiency. The method can be combined with conventional fermentation and separation processes of acetone and butanol, and the method has industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of biomass refining, and in particular relates to a method for pretreating lignocellulose with a ketone alcohol pretreatment agent. Background technique [0002] In order to effectively curb the increasing greenhouse gas emissions and environmental degradation, the use of lignocellulosic raw materials through saccharification and biotransformation to produce renewable energy and chemicals has attracted increasing attention. In the refining chain of biochemicals obtained by using lignocellulosic raw materials such as agricultural wastes and forest resource wastes through pretreatment, enzymatic saccharification, fermentation, and separation, one of the main bottlenecks restricting the development of technology is fiber quality. Advanced pretreatment technology, through a reasonable cellulose pretreatment scheme, can destroy the crystal structure of cellulose in lignocellulosic raw materials, reduce the polyme...

Claims

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Application Information

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IPC IPC(8): C12P19/14C12P19/02C12P7/36C12P7/16C12P7/10D21C3/00C12R1/145C12R1/865
CPCC12P7/10C12P7/16C12P7/36C12P19/02C12P19/14C12P2201/00C12P2203/00D21C3/003Y02E50/10
Inventor 谭天伟蔡的秦培勇陈长京文皓张长伟
Owner BEIJING UNIV OF CHEM TECH
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