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A kind of method for preparing hydrolyzed sugar from lignocellulose raw material

A technology of lignocellulose and hydrolyzed sugar, which is applied in the direction of fermentation, etc., can solve the problems of affecting the effect of cellulose enzymatic hydrolysis and ethanol fermentation, low concentration of hydrolyzed sugar, and affecting energy consumption of ethanol rectification, so as to omit the process of detoxification and concentration , high sugar concentration, and the effect of reducing the production of inhibitors

Active Publication Date: 2018-08-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the use of lignocellulosic raw materials to prepare hydrolyzed sugar has made great progress, there are still some problems: (1) The inhibitors produced in the acid hydrolysis process affect the effect of cellulose enzymatic hydrolysis and ethanol fermentation, and need to be detoxified by water washing; ( 2) The concentration of hydrolyzed sugar is low, and the sugar solution needs to be concentrated before fermentation, otherwise it will affect the energy consumption of ethanol rectification, etc.

Method used

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  • A kind of method for preparing hydrolyzed sugar from lignocellulose raw material
  • A kind of method for preparing hydrolyzed sugar from lignocellulose raw material
  • A kind of method for preparing hydrolyzed sugar from lignocellulose raw material

Examples

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Effect test

Embodiment 1

[0033] Using the present invention figure 1 In the process flow shown, the effective volume of the column reactor is 5 L. The lignocellulose raw material is corn stalks with a particle size of 0.15mm. 5 kg of corn stalk particles were packed into the column reactor and compacted, and the pressure of the hydraulic piston was 0.4 MPa. A dilute acid eluent was prepared to elute the lignocellulosic raw material. The dilute acid eluent included 2.5wt% dilute sulfuric acid, 0.5wt% NaCl, 0.01wt% SDS and 0.2wt% ammonium oxalate. The liquid-solid mass ratio is 3.5:1, the liquid phase residence time is 1 h, the elution time is 3.5 h, no circulation, and the eluent is collected into the waste liquid tank. After elution, extrusion dehydration can be carried out, so that the moisture content of corn stalks is 40%, and a part of inhibitors can be squeezed out from the other side. Prepare 6.67 L of 2.5wt% dilute sulfuric acid, start the temperature control device, control the temperature ...

Embodiment 2

[0035] Using the same conditions as in Example 1, the difference is that: the dilute acid eluent includes a concentration of 0.5wt% dilute sulfuric acid, 1.0wt% NaCl, 0.05wt% SDS and 0.6wt% ammonium oxalate, washing The removal time is 4.0 h; the second difference is that the temperature of dilute acid hydrolysis is 75°C. After dilute acid hydrolysis, the concentration of glucose in the collector was determined to be 0.47wt%, and the concentration of xylose was 10.4wt%. The yield of xylose in the dilute acid hydrolysis stage was 93.1%, and the yield of glucose was 0.03%. The third difference is: set the pH in the collector to 5.5, and the temperature to 55°C. After enzymolysis, the glucose concentration in the collector was measured to be 18.9wt%, and the xylose concentration was 10.9wt%. The xylose yield was 95.8% and the glucose yield was 92.1% after dilute acid hydrolysis and cellulose enzymatic hydrolysis. The concentrations of inhibitors total phenol, acetic acid, furfu...

Embodiment 3

[0037] The same conditions as in Example 1 were used, except that the dilute acid eluent included 2.0wt% dilute sulfuric acid and 0.5wt% ammonium oxalate, and the elution time was 4.5h. After dilute acid hydrolysis, the concentration of glucose in the collector was determined to be 0.51wt%, and the concentration of xylose was 10.1wt%. The yield of xylose in the dilute acid hydrolysis stage was 92.4%, and the yield of glucose was 0.03%. After enzymolysis, the glucose concentration in the collector was measured to be 19.1wt%, and the xylose concentration was 10.1wt%. The xylose yield was 94.8% and the glucose yield was 92.1% after dilute acid hydrolysis and cellulose enzymatic hydrolysis. The concentrations of inhibitors total phenol, acetic acid, furfural and hydroxymethylfurfural in the hydrolyzate were 0.04 g / L, 3.3 g / L, 0.81 g / L and 0.7 g / L, respectively.

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Abstract

The invention relates to a method for preparing hydrolysis sugar from a lignocellulose raw material. The method comprises the following contents: (1) a column reactor is filled with a lignocellulose granular raw material, the top of the reactor is provided with a hydraulic piston structure capable of compacting the raw material; (2) a dilute acid eluent is heated to 60-99 DEG C and then added into the reactor through the top of the reactor to carry out elution so as to remove part of inhibitors; (3) a dilute acid hydrolysate is heated to 60-99 DEG C and then is added into the reactor through the top of the reactor by a circulating pump to carry out circulated hydrolysis so as to obtain a concentrated hydrolysis sugar liquor; and (4) pH value of the concentrated hydrolysis sugar liquor is adjusted to 4.5-5.5, and cellulose is added into the hydrolysis sugar liquor to carry out circulated enzymolysis so as to obtain a concentrated sugar liquor containing xylose and glucose. The prepared concentrated sugar liquor contains few inhibitors and has high sugar concentration. Negative effects of inhibitors generated during the dilute acid hydrolysis process on cellulase hydrolysis and enzymatically decomposed glucose fermentation for ethanol production are solved, and the hydrolysis sugar concentration process is saved.

Description

technical field [0001] The invention relates to a method for preparing hydrolyzed sugar from lignocellulosic raw materials, in particular to a two-step method for preparing xylose and glucose by hydrolyzing lignocellulosic 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 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 million tons of straw can be used as energy, equivalent to 180 million tons of standard coal, which can be trans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P19/14C12P19/02
Inventor 张全关浩唐开宇
Owner CHINA PETROLEUM & CHEM CORP
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