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A kind of pretreatment method of lignocellulose raw material

A lignocellulose and pretreatment technology, which is applied in the processing of fiber raw materials, pulping of cellulose raw materials, fiber raw materials, etc., can solve the problems of high cost, inability to use slag fermentation and simultaneous saccharification fermentation, and complicated operation, and achieve sugar content. Less loss, reduced inhibitor production, low inhibitor content effect

Active Publication Date: 2017-03-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The following problems exist: (1) Fermentation with slag can effectively reduce the loss of sugar, and simultaneous saccharification and fermentation can increase the enzymatic hydrolysis rate of cellulose and reduce the amount of cellulase used. After the above-mentioned detoxification process, fermentation with slag and simultaneous saccharification and fermentation cannot be used (2) After the lignocellulosic raw material is pretreated, the inhibitors produced are separated from the hydrolyzate, which is cumbersome and costly

Method used

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  • A kind of pretreatment method of lignocellulose raw material
  • A kind of pretreatment method of lignocellulose raw material
  • A kind of pretreatment method of lignocellulose raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Using the present invention figure 1 The process flow shown, pretreatment of lignocellulosic feedstock. The dipping solution used is tap water, which is heated to 90°C. Start the conical screw device and the equal-diameter screw device, and continuously add the heated impregnation liquid and corn stalk particles into the conical screw at the same time through the feed hopper at a ratio of 3:1 to the liquid-solid mass ratio, and the temperature in the conical screw is controlled The temperature is 170°C, and the residence time of corn stalks in the conical screw is 20 min by adjusting the frequency of the screw motor. The concentration of glucose in the extrusion liquid of the conical screw device was 1 g / L, the concentration of xylose was 8 g / L, the total phenol was 75 mg / L, the acetic acid was 7 g / L, and the furfural was 0.25 g / L. Check out. The raw material after the first cooking enters the equal-diameter screw device, and tap water is added according to the liqu...

Embodiment 2

[0048] Using the same process conditions as in Example 1, the lignocellulosic raw material was pretreated. The difference is that the impregnation solution used contains 0.5wt% NaCl, 0.01wt% SDS and 0.6wt% ammonium oxalate, and is heated to 70°C.

[0049]The concentration of glucose in the extrusion liquid of the conical screw device was 1 g / L, the concentration of xylose was 7 g / L, the total phenol was 80 mg / L, the acetic acid was 7.5 g / L, and the furfural was 0.3 g / L. Check out.

[0050] The dry matter concentration of pretreated corn stover (PCS) was 32.6wt%, the cellulose content in the dry matter was 40.3wt%, the hemicellulose content was 7.5wt%, the xylooligosaccharide content was 6.3wt%, and the xylose content was 9.7wt%. The concentration of xylose in the PCS extrusion liquid is 39.3g / L, the concentration of glucose is 5.2g / L, the concentration of xylooligosaccharide is 23.0g / L, the concentration of oligoglucose is 1.1g / L, and the concentration of acetic acid is 2.8g / ...

Embodiment 3

[0054] The same process conditions as in Example 1 were used, except that the impregnating solution used contained 1.0wt% NaCl, 0.05wt% SDS and 0.2wt% ammonium oxalate, and was heated to 90°C. The second difference is that the liquid-solid mass ratio of the steeping liquid to the corn straw is 4:1, the residence time in the conical screw is 25 min, and the cooking temperature is controlled at 150°C. The third difference is: the liquid-solid mass ratio in the equal-diameter screw device is 1:2, the temperature is controlled at 220°C, and the residence time is 10 minutes.

[0055] The concentration of glucose in the conical screw extruded liquid was 0.8 g / L, the concentration of xylose was 6 g / L, the total phenol was 78 mg / L, the acetic acid was 7.4 g / L, and the furfural was 0.2 g / L. Others were not detected .

[0056] The dry matter concentration of the pretreated corn stover (PCS) was 34.8wt%, the cellulose content in the dry matter was 39.8wt%, the hemicellulose content was ...

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Abstract

The invention provides a pretreatment method of a lignocellulose raw material, which includes the steps of (1) mixing the crushed lignocellulose raw material with an impregnation liquid, continuing to transport the mixture to a conical screw device; (2) performing continuous kneading, impregnating, steaming, squeezing and dewatering of the raw material with the impregnation liquid in the conical screw device, and controlling a temperature within 120-180 DEG C and the residence time within 3-30 min; (3) continuing to feed the raw material into an equal-diameter screw device and performing secondary steaming, and controlling the temperature within 180-220 DEG C and the residence time within 4-40 min; (4) allowing the raw material to move to a discharge port under the thrust action of a screw and performing steam explosion; and (5) allowing the raw material after steam explosion to enter a cyclone separator to be separated. The method adopts combined technology of segmented temperature control steaming and steam explosion, can remove part of the enzymatic hydrolysis and fermentation inhibitors before the steam explosion treatment, and also can reduce the inhibitor generation during the hydrolysis of xylose; at the same time, the method realizes the integrated process of continuous feeding, impregnating, squeezing, dewatering, steaming, steam explosion and separating of the pretreatment.

Description

technical field [0001] The invention relates to a pretreatment method of lignocellulose raw materials, in particular to a method for steam explosion pretreatment of lignocellulose raw materials. Background technique [0002] The biomass produced by photosynthesis in the world is about 170 billion tons every year, and its energy is equivalent to 10 times of the total annual global energy consumption, and the utilization as energy is less than 1% of the total. As the country restricts the use of food crops as bioenergy raw materials, the utilization of lignocellulosic raw materials is becoming more and more important. The annual output of crop straw in my country can reach 700 million tons. Apart from some being used as raw materials for papermaking, cooking fuel, feed fertilizer and straw returning to the field, about 350 million tons of straw can be used as energy, equivalent to 180 million tons of standard coal, which can be transformed into 100 million tons of fuel alcohol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P19/14D21B1/12
CPCC12P19/14C12P2201/00D21B1/36D21C3/20D21C3/222D21C5/005Y02P20/10
Inventor 张全关浩唐开宇
Owner CHINA PETROLEUM & CHEM CORP
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