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Method for pre-treating biomass by coupling vapor phase digestion and flash evaporation

A technology for pretreatment of biomass and biomass, applied to the preparation of organic compounds, biofuels, chemical instruments and methods, etc., can solve the problems of increasing demand for high-value utilization of biomass resources and reduce the amount of use and the effect on energy consumption

Inactive Publication Date: 2011-10-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] [Purpose of the present invention] The purpose of the present invention is to provide a gas-phase cooking and flash evaporation coupling pretreatment for the increasing demand for high-value utilization of biomass resources, and the biomass pretreatment method cannot meet its requirements. Biomass method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The pretreatment process for the purpose of enzymatic fermentation of corn stalks is as follows:

[0013] (1) Gas-phase cooking: Cut the corn stalk raw material into 3-5cm, add water to adjust the moisture content to 30%, put it into a gas-phase cooking tank, fill it with steam, and cook it in gas-phase under a pressure of 1.6MPa for 6 minutes;

[0014] (2) Flash steaming: After gas-phase cooking, flash steam releases water vapor quickly, and after the steam is released, the straw material is unloaded from the gas-phase cooking tank;

[0015] (3) Use cellulase to enzymolyze the corn stalk material after gas-phase cooking and flash steaming, and enzymolyze the cellulose at a dosage of 10FPA / g dry material, pH 4.8, and 50°C for 48 hours. The rate reaches 85%, and the sugar obtained by enzymatic hydrolysis can be used for the fermentation of ethanol, lactic acid, butanol, etc.

Embodiment 2

[0017] The pretreatment process for the purpose of cleaning and degumming hemp fiber is as follows:

[0018] (1) Vapor-phase cooking: Soak the raw hemp in water for 1 hour, put it in a cage, put it into a gas-phase cooking tank, fill it with steam, and cook it in a gas-phase for 3 minutes under a pressure of 0.6 MPa;

[0019] (2) Flash steaming: after the gas phase cooking, the flash steam releases the steam quickly, and after the steam is released, the hemp fiber is taken out from the gas phase cooking tank;

[0020] (3) Post-treatment of hemp fiber: the ramie material after vapor phase cooking and flash evaporation is subjected to knocking treatment to remove degraded pectin, hemicellulose, lignin components and other impurities. (W / W) Bleaching with liquid chlorine for 5 minutes. After bleaching, soak in 2% fiber emulsified oil at 40°C for 15 minutes to complete oiling. After drying, dry with airflow to obtain degummed hemp fine dry hemp.

Embodiment 3

[0022] The pretreatment process for the purpose of extracting lignin from wheat straw and enzymatic fermentation of cellulose is as follows:

[0023] (1) Vapor-phase cooking: cut the raw material of wheat straw into 3-8cm, put it into a gas-phase cooking tank, fill it with ethanol steam, and cook it in gas-phase under a pressure of 1.3MPa for 10 minutes;

[0024] (2) Flashing: After gas-phase cooking, the ethanol vapor is quickly released by flashing, and the ethanol is recycled through the shell-and-tube condenser. After the ethanol vapor is released, the wheat straw material is discharged from the gas-phase cooking tank;

[0025] (3) Extract lignin from the wheat straw material after gas-phase cooking and flash steaming treatment with ethanol, the lignin extraction rate is 80%, and the material after extracting lignin is enzymolyzed with cellulase. g dry material, pH 4.8, after enzymatic hydrolysis at 50°C for 48 hours, the enzymatic hydrolysis rate of cellulose reaches 83%....

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PUM

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Abstract

Development and utilization of regenerative biomass resources arouse wide attention, a pretreatment step is first performed in the utilization of biomass, and the pretreatment process determines the production efficiency, the production cost, the quality and the like of biomass products. Therefore, development of a clean and efficient pretreatment method is very critical for the utilization of the biomass. The invention provides a method for pre-treating biomass by coupling vapor phase digestion and flash evaporation. The method comprises the following steps of: digesting biomass raw materials in a vapor phase medium of certain temperature and pressure for certain time, and releasing and reclaiming the vapor phase medium by flash evaporation. According to the actual requirement, the vapor phase medium can be an inorganic or organic substance such as water vapor, ethanol steam or the like; and a series of chemical and physical changes are produced in the vapor phase digestion process, and natural structures of the biomass raw materials are broken to facilitate subsequent utilization. The method can be used for biomass raw material pretreatment of biological energy, material and chemical production processes, and can be also used for Chinese medicament preparation, natural plant fiber degumming and the like.

Description

technical field [0001] The invention belongs to the field of high-value utilization of biomass raw materials, and in particular relates to a method for pretreating biomass coupled with vapor phase cooking and flash evaporation. Background technique [0002] At the beginning of the last century, the vast majority of non-fuel industrial products, including dyes, paints, medicines, chemicals, cloth, synthetic fibers and plastics, were basically derived from biomass. However, in the 1970s, organic compounds derived from petroleum replaced these products derived from biomass to a considerable extent, and its market share reached more than 95%. In terms of the proportion of energy consumption, the share of petroleum exceeded More than 70%. However, the depletion of petroleum resources, the greenhouse effect and other environmental pollution caused by the extensive use of fossil energy, etc., from the perspective of world industrial development trends, biomass raw materials will g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10C12P7/56C12P7/16D01C1/02C08H7/00C07C215/30C07C213/10C12P7/06C07D407/04
CPCY02E50/10
Inventor 陈洪章彭小伟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI