Method for preparing cellulosic ethanol through alkali pretreatment

A technology of cellulose ethanol and alkali pretreatment, applied in the direction of fibrous fillers, chemical instruments and methods, sugar production, etc., can solve the problems of no comprehensive utilization, waste of resources, reduction of monosaccharide yield, etc., and achieve comprehensive utilization , reduce production costs, and benefit the effect of purification

Pending Publication Date: 2020-05-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, in the whole process flow, the pretreatment process is the least mature, and the cost of pretreatment is the highest
The main reasons are: (1) the loss of cellulose and hemicellulose in the pretreatment process reduces the yield of monosaccharide and wastes resources; (2) there is no comprehensive utilization of lignin, cellulose and hemicellulose in biomass The main components increase the cost of raw materials; (3) pretreatment of wastewater pollutes the environment; (4) impurities are still in the system, resulting in fermentation inhibitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A method for preparing cellulose ethanol by alkali pretreatment, comprising the following steps, and the following steps are carried out in sequence:

[0072] Step 1. Preliminary preparation:

[0073] Crush the corn stalks, remove the pith, sieve and remove impurities, and prepare purified straw granules with an average particle size of 4 cm for later use; use deionized water to prepare 500 L of NaOH solution with a concentration of 5 wt %;

[0074] Step 2. Alkali-catalyzed dissolution of hemicellulose and lignin:

[0075] (1) According to the solid-liquid ratio of 1Kg: 5L, add 100Kg of purified straw particles and 500L of NaOH solution with a concentration of 5wt% in step 1 into the reactor, seal it, heat up to 140°C for 2 hours, and cool down to less than 50°C. ℃, discharge, centrifuge to separate liquid phase and alkali soluble slag;

[0076] (2) Alkali-dissolved slag is added to the demineralizer, 500L deionized water is added into the demineralizer, stirred and d...

Embodiment 8

[0097] Embodiment eight, extract arabinose:

[0098] (1) Distill and dehydrate the mother liquor containing arabinose again under reduced pressure, add 2 times of glycerin according to the volume ratio, stir and dissolve at 80°C for 1 hour, filter while hot to obtain a glycerin solution containing arabinose, add it to absolute ethanol, and stir After uniformity, cool and crystallize to prepare crude arabinose;

[0099] (2) Crude arabinose is dissolved in glycerin, and ethanol is added to precipitate to obtain 18Kg of pure arabinose.

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PUM

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Abstract

The invention relates to a method for preparing cellulosic ethanol through alkali pretreatment. The technological process comprises the following steps of performing alkali fusion on hemicellulose andlignin, and separating crude cellulose; precipitating oligosaccharide with sulphuric acid to prepare lignin nanometer particles; hydrolyzing oligosaccharide with dilute acid to obtain a xylose solution; performing low-temperature dehydrating and carbon sequestration treatment on the lignin nanometer particles, performing thermolysis, and performing activation so as to obtain lignin based nanometer carbon black; drying the coarse cellulose, hydrolyzing the cellulose with concentrated acid, performing sugar and acid separation, and performing hydrolyzing with dilute acid to prepare a glucose solution; combining the xylose solution with the glucose solution, performing neutralization and precipitation, purifying a sugar solution, and performing fermentation so as to prepare ethanol; and performing rectification to prepare 95% ethanol, and performing mother liquid separation so as to obtain xylose and arabinose.According to the method disclosed by the invention, by an alkaline pretreatment method, the hemicellulose, the lignin and the cellulose are separated; the lignin is used for preparing the nanometer particles or is deeply processed into nanometer carbon black, the purified cellulose is subjected to hydrolyzing by the concentrated acid and fermentation to obtain the cellulose ethanol, the hemicellulose is used for preparing the xylose and arabinose, three large components ofthe biomass are fully utilized, production of three wastes (waste gas, waste water, industrial residues) does not exist, and comprehensive utilization of the biomass is realized.

Description

technical field [0001] The invention belongs to the field of biomass energy chemical industry, and in particular relates to a method for preparing cellulose ethanol through alkali pretreatment. Background technique [0002] When cellulase is used to hydrolyze biomass to produce ethanol, cellulase must be contacted and adsorbed on the cellulose substrate to react, but factors such as the protective effect of lignin on cellulose and the chemical structure of cellulose covered by hemicellulose cellulose is difficult to hydrolyze. Therefore, pretreatment technology serves as a key step in the conversion of lignocellulose into ethanol. For this reason, people have carried out a lot of research and development work on the pretreatment methods of lignocellulosic raw materials, mainly including physical methods, chemical methods, physicochemical methods and biological methods. However, so far, in the whole process flow, the pretreatment process is the least mature, and the cost of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10C13K13/00C09C1/48C07G1/00C08H7/00B82Y30/00B82Y40/00
CPCC12P7/10C13K13/002C13K13/00C09C1/48C07G1/00C08H6/00B82Y30/00B82Y40/00Y02E50/10
Inventor 王晓峰朱燕超杨晓敏田玉美王子忱
Owner JILIN UNIV
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