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, and fiber raw materials, can solve the problems of high cost, cumbersome operation, inability to use slag fermentation and simultaneous saccharification fermentation, etc. Less loss, lower inhibitor content, and reduced inhibitor production effect

Active Publication Date: 2015-05-13
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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  • Pretreatment method of lignocellulose raw material
  • Pretreatment method of lignocellulose raw material
  • Pretreatment method of lignocellulose raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Using the invention figure 1 The process flow shown is to pretreat the lignocellulosic raw material. The immersion liquid used is tap water and heated to 90°C. Start the conical screw device and the equal-diameter screw device, and continuously add the heated soaking liquid and corn stalk particles into the conical screw at the ratio of liquid-solid mass ratio of 3:1 through the feeding hopper. The temperature in the conical screw is controlled. At 170℃, 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 extrudate of the conical screw device is 1 g / L, the concentration of xylose is 8 g / L, the total phenol is 75 mg / L, acetic acid is 7 g / L, furfural is 0.25 g / L, and others Check out. The raw materials after the first cooking enter the equal-diameter screw device, and tap water is added in the ratio of liquid-solid mass ratio of 1:3 for the second cooking. The temperature is ...

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 extrudate of the conical screw device is 1 g / L, the concentration of xylose is 7 g / L, the total phenol is 80 mg / L, acetic acid is 7.5 g / L, furfural is 0.3 g / L, and others Check out.

[0050] The dry matter concentration of pretreated corn stalks (PCS) was 32.6wt%, the cellulose content of the dry matter was 40.3wt%, the semi-fiber content was 7.5wt%, the xylo-oligosaccharide content was 6.3wt%, and the xylose content was 9.7wt%. The concentration of xylose in the PCS extruded solution is 39.3g / L, the concentration of glucose is 5.2g / L, the concentration of xylo-oligosaccharide is 23.0g / L, the concentration of gluco-oligosaccharide is 1.1g / L, and the concentration of acetic acid is 2.8 g / L. The...

Embodiment 3

[0054] The same process conditions as in Example 1 are adopted, with the first difference being: the impregnation solution used contains 1.0 wt% NaCl, 0.05 wt% SDS, and 0.2 wt% ammonium oxalate, and is heated to 90°C. The second difference is that the liquid-solid mass ratio of the dipping liquid to the corn stover 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 ℃, and the residence time is 10 min.

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

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

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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 global annual biomass production through photosynthesis is about 170 billion tons, its energy is equivalent to 10 times the total global energy consumption, and the amount of energy used as energy is less than 1% of the total. As the country restricts the use of food crops as bio-energy raw materials, the use of lignocellulosic raw materials becomes more and more important. The annual output of crop straw in my country can reach 700 million tons. Except for some used as raw materials for papermaking, cooking fuel, feed and fertilizer, and straw returning to the field, about 350 million tons of straw can be used for energy purposes, which is equivalent to 180 million tons of standard coal. It is 100 million tons of fuel alcohol or 50 million tons of biodie...

Claims

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Application Information

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IPC IPC(8): D21B1/12C12P19/14
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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