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Lignocellulose raw material dilute acid steam explosion pretreatment method

A technology of lignocellulosic raw materials and lignocellulose, which is applied in the direction of fiber raw material treatment, raw material pretreatment, fiber raw materials, etc., can solve the problems of cumbersome operation, high cost, and inability to use slag fermentation, etc., so as to improve acidolysis efficiency and improve Effects of enzymatic hydrolysis and fermentability

Inactive Publication Date: 2016-07-20
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these methods all need to carry out solid-liquid separation to pretreatment lignocellulosic raw material or enzymolysis liquid, after pretreatment lignocellulosic raw material extruded liquid or enzymatic hydrolysis clear liquid are processed, there are following problems: (1) adopt above-mentioned removal Fermentation with slag and simultaneous saccharification and fermentation cannot be used after the poisoning process. Fermentation with slag can effectively reduce the loss of sugar, and simultaneous saccharification and fermentation can increase the rate of cellulose enzymatic hydrolysis and the amount of cellulase used; (2) Lignocellulosic raw materials are pretreated Then separate the produced inhibitors from the hydrolyzed sugar solution, the operation is cumbersome and the cost is high

Method used

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Examples

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Effect test

Embodiment 1

[0035] Using the present invention figure 1 The process flow shown. An inhibitor eluent was prepared to elute the lignocellulose raw material, and the inhibitor eluent included dilute sulfuric acid at a concentration of 1wt%, 0.5wt% NaCl, 0.01wt% SDS and 0.2wt% ammonium oxalate. The prepared inhibitor eluent was preheated to 90°C in a storage tank. Turn on the screw motor of the impregnation detoxification feeder and digester, start the belt conveying system, and the heated inhibitor eluent is continuously added to the impregnation detoxification feeder at the same time as the liquid-solid ratio of 5:1 through the conveying pump. in the hopper of the machine. By adjusting the frequency of the dipping detoxification feeder and the screw motor of the digester, the residence time of corn stalks in the dipping detoxification feeder was 6 minutes, and the residence time in the digester was 8 minutes. The temperature control in the immersion feeder was 120°C, and the temperature ...

Embodiment 2

[0038] Using the same conditions as in Example 1, the difference is that: the inhibitor acid eluent includes a concentration of 0.5wt% dilute sulfuric acid, 1.0wt% NaCl, 0.05wt% SDS and 0.6wt% ammonium oxalate, The residence time of the corn stalk raw material in the dipping detoxification feeder is 8 minutes; the second difference is that the concentration of sulfuric acid in the digester is 1.5%, and the temperature of the digester is controlled at 190°C. The dry matter concentration of the pretreated corn stalks was 31.5%, the proportion of insoluble dry matter was 66.9%, the cellulose content in the dry matter was 38.3%, and the hemifiber content was 8.8%. The concentration of xylose in the extruded liquid was 4.9%, the concentration of glucose was 0.6%, the concentration of xylooligosaccharide was 0.4%, the concentration of oligoglucose was 0.2%, the concentration of acetic acid was 0.4%, and the concentration of total phenol was 39.2mg / L. The enzymatic hydrolysis and fer...

Embodiment 3

[0045] The inventive method comprises the steps:

[0046] Step 1, crushing: crushing the lignocellulosic raw material corn stalks into 0.1mm particles;

[0047] Step 2, impregnation, detoxification and feeding: prepare the inhibitor eluent and place it in the inhibitor eluent storage tank, and heat it to 60°C in the storage tank, the heated inhibitor eluent and the crushed wood The fiber raw material is continuously added to the hopper of the dipping detoxification feeder at a mass ratio of 10:1, and the inhibitor eluent and lignocellulosic raw material added to the hopper of the dipping detoxification feeder fall freely from the hopper to the conical screw device In the conical screw device, the temperature of the liquid-solid mixed phase in the screw sleeve is controlled by passing steam into the interlayer to 105°C, the residence time is 20min, and the thrust and Kneading, dipping, detoxification, extrusion and dehydration are realized under the resistance of the annular m...

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Abstract

The invention relates to a lignocellulose raw material dilute acid steam explosion pretreatment method. The method comprises a pulverizing step, an impregnation and detoxification feeding step, a steaming step, a pressure-relief explosion step and a cyclone separation step. According to the invention, a dilute acid elution liquid is used for carrying out impregnation and detoxification upon the lignocellulose raw material in advance in an impregnation and detoxification feeder. During the impregnation process, acidic ions can fully contact the lignocellulose raw material, such that the acidolysis efficiency in a steamer can be improved. During the detoxification process, a maximal amount of inhibitors inhibiting enzymolysis and ethanol fermentation can be hydrolyzed and eluted under a condition of less xylose accumulation. According to the lignocellulose raw material dilute acid steam explosion pretreatment method provided by the invention, a tapered impregnation and detoxification feeder is adopted on the front end of the steamer. The lignocellulose raw material is rubbed and pressed with a conical screw and an annular metal film stoppers. Therefore, continuous detoxification and continuous feeding can be realized, and the enzymolysis and fermentation capacity of the dilute acid-pretreated lignocellulose raw material are improved.

Description

technical field [0001] The invention relates to a lignocellulosic raw material pretreatment method, in particular to an integrated dilute acid steam explosion pretreatment method of continuous feeding, continuous impregnation, continuous detoxification, continuous extrusion dehydration, continuous dilute acid cooking and intermittent explosion. 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 for 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 mil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/36D21B1/12D21B1/02D21B1/00
CPCD21B1/36D21B1/00D21B1/023D21B1/12
Inventor 姚秀清杨爽陆光
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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