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A method for producing ethanol from lignocellulosic biomass

A lignocellulose and biomass technology, which is applied to biofuels, fermentation and other directions, can solve the problems of high particle size requirements of raw materials, waste of hemicellulose hydrolysis, waste of alkali, etc., so as to improve the yield of ethanol, save energy, and reduce The effect of equipment investment

Active Publication Date: 2017-12-05
SHANDONG LONGLIVE BIO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent with the publication number CN102517341A discloses a process for producing fuel ethanol by using straw-like lignocellulose as raw material. In the patent, the raw material is pulverized to pass through an 80-mesh sieve and then dried, and the raw material is pre-treated with 1% sodium hydroxide. treatment, the pretreated solids are enzymatically saccharified, and the saccharified liquid is fermented by yeast to obtain ethanol, but this patent has high requirements on the particle size of raw materials, and direct alkali treatment causes waste of hemicellulose hydrolysis, and saccharification and fermentation step by step will lead to fiber Intermediate products such as disaccharides or glucose inhibit cellulase and are prone to bacterial contamination
Cheng Wangkai et al. published "Calcium Hydroxide Pretreatment and Enzymolysis Experimental Research on Wheat Straw" in Cellulose Science and Technology, Volume 17, Issue 1, 2009. Waste of cellulose hydrolysis, no further treatment of sugar solution, no fermentation into ethanol
Yang Juan et al. published "Cellulosic Ethanol Raw Material Pretreatment Method and Process Flow Research Progress" in Volume 32, No. 1, 2013. The article mentions the production of ethanol by synchronous saccharification and fermentation after dilute acid pretreatment of raw materials, alkali neutralization, Among them, the acid treatment temperature is 160℃~220℃, which will produce a large amount of enzyme hydrolysis and fermentation inhibitors, and the alkali is only used to neutralize the acid hydrolyzate, resulting in waste of alkali

Method used

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  • A method for producing ethanol from lignocellulosic biomass
  • A method for producing ethanol from lignocellulosic biomass
  • A method for producing ethanol from lignocellulosic biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Production of ethanol from wheat straw:

[0034] The specific preparation method is as follows:

[0035] (1) Pretreatment

[0036] Wash and dry the wheat straw, cut and crush it to a length of 1-2 cm, weigh 10 g of the straw and place it in 100 mL of sulfuric acid solution with a mass fraction of 1%, react at 80°C for 24 hours, and separate the solid and liquid by suction filtration, and the supernatant is acid The hydrolyzate mainly includes xylose and a small amount of furfural. Put the residue in 10 times the volume (g / ml) of water, add 0.1g of calcium oxide per gram of the residue, react at 60°C for 20h, dissolve the lignin in the residue and swell the cellulose to obtain a mixture A; The changes of each component are shown in Table 1.

[0037] (2) Enzymolysis and fermentation

[0038]Add the acid hydrolyzate to the mixture A, the mass ratio of the acid hydrolyzate to the mixture A is 0.5:1, to obtain the mixture B, after heat preservation at 80°C for 30min, whe...

Embodiment 2

[0044] Production of ethanol from poplar wood chips:

[0045] The specific preparation method is as follows:

[0046] (1) Pretreatment

[0047] Wash and dry poplar sawdust, crush it through a 60-mesh sieve, weigh 10g sawdust, place it in 60mL sulfuric acid solution with a mass fraction of 2%, react at 100°C for 4h, centrifuge to separate the solid from the liquid, and the supernatant is the acid hydrolyzate , mainly including xylose and a small amount of furfural. Put the residue in 6 times the volume (g / ml) of water, add 0.08g of calcium hydroxide per gram of the residue, react at 100°C for 2 hours, dissolve the lignin in the residue and swell the cellulose to obtain mixture A; before and after pretreatment The changes of each component in the raw materials are shown in Table 2.

[0048] (2) Enzymolysis and fermentation

[0049] Add the acid hydrolyzate to the mixture A, the mass ratio of the acid hydrolyzate and the mixture A is 1:1, to obtain the mixture B, after heat t...

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Abstract

The invention discloses a method for producing ethanol from lignocellulosic biomass. The method comprises the following steps: (1) grinding raw materials, adding a sulfuric acid solution into the ground raw materials and carrying out normal-pressure heat treatment, and centrifuging or filtering so that acid hydrolysate and residue are separated; (2) adding the residue to water, adding calcium hydroxide or calcium oxide, and carrying out normal-pressure heat treatment so as to obtain a mixture A; (3) adding the acid hydrolysate to the mixture A so as to obtain a mixture B, carrying out heat preservation treatment at 50-100 DEG C for 0.5-2hr, cooling to 25-45 DEG C, and regulating the pH value to 3.5-5.5; and (4) adding cellulase to the mixture B, and simultaneously adding a nitrogen source and nutritive salt; according to the volume of the mixture B, inoculating 2-8% of activated xylose fermenting bacteria and 1-4% of saccharomyces cerevisiae, and carrying out simultaneous saccharification and fermentation so as to produce the ethanol. By coordinating the steps of preprocessing, enzymatic hydrolysis, fermenting and the like in a process of converting the biomass into the ethanol, the method disclosed by the invention can be used for effectively reducing the content of a fermentation inhibitor generated in the preprocessing course and the method can be used for increasing the conversion yield of the ethanol.

Description

technical field [0001] The invention relates to a method for producing ethanol from lignocellulosic biomass. Background technique [0002] The main energy sources used in the world today are coal, oil and natural gas, which are non-renewable and have limited reserves. The combustion of these fossil fuels has also led to many environmental problems such as air pollution and global warming. Ethanol has been proven to be used as a vehicle fuel, and has the advantages of high combustion efficiency, low pollution, and zero carbon emissions. Lignocellulosic biomass (forest trees, weeds, agricultural waste, etc.) is plant biomass composed of cellulose, hemicellulose and lignin, among which cellulose and hemicellulose are polymerized by reducing sugars. Ethanol can be obtained by hydrolyzing cellulose and hemicellulose into monosaccharides and then fermenting monosaccharides. [0003] The structure of lignocellulosic biomass is complex and the components are closely connected. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P19/14C12P7/10
CPCY02E50/10
Inventor 夏蕊蕊王新明孙保剑肖林覃树林杨建李红震王艳君
Owner SHANDONG LONGLIVE BIO TECH CO LTD