Method for improving straw enzymolysis efficiency by synergistic pretreatment of Steam Explosion and ultra micro-pulverization

A technology of ultrafine pulverization and pretreatment, which is applied in the direction of water/steam pretreatment, fine split raw material pretreatment, fiber raw material treatment, etc. It can solve the problems of incomplete enzymatic hydrolysis of hemicellulose, re-pollution of cellulose, waste of resources, etc. problems, to achieve the effect of increasing chemical reactivity, increasing particle surface area, and saving energy consumption

Inactive Publication Date: 2007-04-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method of steam explosion and ultramicronization to improve the enzymolysis rate of rice straw in order to solve the problems of low efficiency of rice straw biomass pretreatment, waste of resources, re-pollution and incomplete enzymolysis of cellulose and hemicellulose. Comminution synergistic processing method, this method combines the advantages of steam explosion to loosen the tissue structure and destroy the cell structure and the advantages of ultra-fine pulverization with large and high efficiency, increasing the particle surface area and chemical reactivity, and avoiding the pretreatment of rice straw under the condition of high steam explosion intensity The excessive hydrolysis of hemicellulose, the excessive condensation of lignin and the generation of a large number of by-products, while reducing the energy consumption of steam explosion

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 20g of rice straw with a water content of 10% into the steam explosion pot, the blasting condition is steam pressure 1.3Mpa, hold for 2 minutes, release the pressure instantly to obtain steam-exploded wheat straw, then air-dry the steam-exploded wheat straw to obtain a moisture content of 6 % air-dried steam-exploded straw; air-dried steam-exploded rice straw is pulverized by a fluidized bed jet-type airflow ultrafine pulverizer, and the steam-exploded rice straw ultrafine powder obtained is 90%; the fluidized bed used in the present embodiment The grading wheel frequency of the jet-type airflow ultrafine pulverizer is 20Hz, the pulverization time is 10min, and the feeding speed is 10Kg / h; the powder particle size is mainly distributed in the range of 63-237 microns, the average fiber length is 180 microns, and the composition cells of the powder account for The proportions were 53.1% for fibroblasts, 26.2% for parenchyma cells, 19.6% for epidermal cells, and 1.1% fo...

Embodiment 2

[0025]Add 20 g of straw with a water content of 15% into the steam explosion tank, the blasting condition is a steam pressure of 1.2Mpa, the holding time is 4 minutes, and the pressure is released instantly to obtain steam-exploded wheat straw; then the steam-exploded wheat straw is air-dried to a water content of 6%; The steam-exploded rice straw after the air-drying is pulverized with a fluidized bed jet-type airflow ultrafine pulverizer, and the technical parameters of the fluidized-bed jet-type airflow ultrafine pulverizer used in this embodiment are: classifying wheel frequency 30Hz, pulverization time 15 minutes, the feeding speed is 15Kg / h, and the yield of ultra-micro steam-exploded rice straw powder is 84%. The particle size of the powder is mainly distributed between 40-160 microns, the average fiber length is 110 microns, and the proportions of the constituent cells of the powder are respectively 45.1% of fibroblasts, 36.6% of parenchyma cells, 17.1% of epidermis cel...

Embodiment 3

[0028] Add 20 g of straw with a water content of 20% into the steam explosion pot, the blasting condition is a steam pressure of 1.0 Mpa, and the pressure is released instantly for 5 minutes to obtain steam-exploded wheat straw, and then the steam-exploded wheat straw is air-dried to a moisture content of 6%. The air-dried steam-exploded rice straw is pulverized with a fluidized bed counter-jet airflow ultrafine pulverizer. The technical parameters of the fluidized bed counter-jet airflow ultrafine pulverizer used in this embodiment are: grading wheel frequency 40Hz, pulverization time 10min, feeding The material speed is 16Kg / h, and the yield of ultra-micro steam-exploded rice straw powder is 82%. The particle size of the powder is mainly distributed in 40-100 microns, the average fiber length is 70 microns, and the proportions of the constituent cells of the powder are 34.8% of fibroblasts, 48.8% of parenchyma cells, 15.0% of epidermis cells, and 1.3% of ducts.

[0029] The ...

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Abstract

A method of increasing stawenzymolysis rate co-pretreated synergy by steam blasting and ultramicro-crashing, the steps are as follows: treating the straw with 10-25% water with steam blasting at under 0.8-1.3Mpa conditions, airdrying the straw, crashing the straw with fluidized bed contraconsperging airflow ultramicro crashing machine, putting into pH 4.8 acetic acid-sodium acetate buffer, at the substrate concentration of 5-10%, adding cellulose 20-40FPA per gram of steam blasted straw spermicropowder, digesting at 40-50 Deg C for 26-36 hours. The cellulase is selected from recumbent Penicillium, Lee Trichoderma, Trichoderma viride, Aspergillus. By using steam blasting and ultramicro-crashing, cellulose in the pretreated straw obtained from the invention can be completely digested, hemicellulose can nearly be completely digested of cellulose. The method has the advantages of easy operaton, short hydrolysis time, clean and on pollution.

Description

technical field [0001] The invention belongs to the field of biomass pretreatment and cellulose enzymolysis, and in particular relates to a steam explosion and superfine pulverization synergistic treatment method for improving the enzymolysis rate of rice straw. Background technique [0002] Rice straw is a rich renewable resource and one of the main crop straws. The total output of rice straw accounts for about 20% of the world's total annual output of straw. In my country, rice straw production accounts for about 35%, with an annual output of about 230 million tons. In terms of structure, the structure and composition of rice straw are highly heterogeneous, with different structural levels at the organ level, tissue level, cell level and molecular level. The basic composition is formed by three major components: cellulose, hemicellulose and lignin. Tightly cross-linked structure. Cellulose has high crystallinity, high degree of polymerization, and is tightly wrapped by l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P1/00D21C1/02D21C1/00A23K1/14C12S3/04A23K10/14A23K10/30
Inventor 陈洪章靳胜英
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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