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Straw pretreatment method for cellulosic ethanol in straw

A technology of straw pretreatment and straw cellulose, applied in the direction of biofuel, fermentation, etc., can solve the problems of large unit consumption of steam, large amount of air entering, and large influence of back-end enzymatic fermentation, etc., and achieve the reduction of secondary recycling, The effect of reducing the input amount and increasing the yield

Inactive Publication Date: 2017-06-13
黑龙江中丹建业生物能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) The amount of air entering during the gas explosion process is relatively large, and the unit consumption of steam is relatively large, generally 0.5t steam / t straw
[0008] (3) After the gas explosion, the acid aldehyde content in the material is greater than 100ppm, which has a great impact on the back-end enzymatic fermentation

Method used

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  • Straw pretreatment method for cellulosic ethanol in straw

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A method for pretreatment of straw cellulose ethanol straw, the composition comprising: the method includes the following steps:

[0028] (1) First, transport the briquetted straw from the various straw storage points scattered in the corn planting area to the straw ethanol production plant;

[0029] (2) The briquette straw at the straw storage point is transported to the two-stage pre-soaking device through the belt conveyor. The shaftless screw is used in the first-stage pre-soaking device to soak the straw device. The soaking temperature is 45°C and the soaking time is 12 minutes. The screw discharge briquette straw has basically been loosened. The second stage adopts the roller conveying device to further wash the straw. The soaking temperature is 40-45°C and the soaking time is 5 minutes. The pretending strong stirring device accelerates the loosening of the straw block. Soak in the washing machine with recycled water;

[0030] (3) The straw soaked in the hydrauli...

Embodiment 2

[0035] According to the straw cellulose ethanol straw pretreatment method described in Example 1, the straw after secondary flashing is sent into the mixer for full stirring, and the liquid caustic soda, recycled water and cellulase are simultaneously mixed during the stirring process. Add the ingredients into the mixer, mix evenly and send the mixed substances to the enzyme hydrolysis tank for decomposition.

Embodiment 3

[0037] According to the straw cellulose ethanol straw pretreatment method described in Embodiment 1 or 2, the hydrothermal environment uses straw with a dry matter content of 40% for liquid-phase cooking, and the cooking uses gas-liquid two-way cooking.

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Abstract

The invention discloses a straw pretreatment method for cellulosic ethanol in straw. Pretreatment technologies for agricultural wastes such as the industrially produced straw mainly comprise acidic hydrolysis, alkaline hydrolysis, adding of chemicals for explosion and other pretreatment processes at the present, and have the problems of complicated treatment process, relatively high energy consumption and pollution to the environment to different extends. The straw pretreatment method for the cellulosic ethanol in the straw comprises the following steps: pre-soaking: removing sand from the straw through a sand remover to remove impurities; dewatering: pressurizing and heating a plug flow reactor through steam with pressure of 15 kg / cm<2> till the pressure is 13.5 kg / cm<2> and the temperature is 190 DEG C, retaining the pressure for 20 minutes, then discharging the straw, and carrying out two-stage flash distillation in a material discharging process of the plug flow reactor; gas production in the second stage of flash distillation during flash distillation: recycling steam from the first stage of flash distillation, producing gas from the second stage of flash distillation, cooling the gas through a cooler, and discharging the gas into a sewage treatment device. The straw pretreatment method is applied to the field of bio-refinery.

Description

[0001] Technical field: [0002] The invention relates to a straw cellulose ethanol straw pretreatment method. [0003] Background technique: [0004] There are great differences in cell composition and chemical composition of cellulose raw materials such as straw, which directly affect their enzymatic hydrolysis and fermentation efficiency. The complexity and inhomogeneity of cellulose, hemicellulose, and lignin structures in straw raw materials are the fundamental reasons for their difficulty in efficient conversion. Therefore, effective pretreatment of straw and other raw materials is necessary. At present, the pretreatment technologies for agricultural waste such as straws in industrialized production mainly include acid hydrolysis, alkali hydrolysis, blasting with chemical agents and other pretreatment methods, which have complicated processing technology, high energy consumption, and environmental pollution to varying degrees. And other issues. [0005] The method of pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10C12P19/14
CPCC12P7/10C12P19/14C12P2201/00Y02E50/10
Inventor 王建业刘玉金葛健
Owner 黑龙江中丹建业生物能源有限公司
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