Method for industrially producing ethyl alcohol through crop straw

A technology for crop straw and ethanol, which is applied in the directions of biofuel, waste fuel, fermentation, etc., can solve the problems of high production cost, high energy consumption, low utilization rate of straw, etc., and achieves reduction of energy consumption and production cost, and simple pretreatment steps. , the effect of reducing production costs

Active Publication Date: 2018-05-18
ZHONGRONG TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of difficult pretreatment of straw raw materials in the production of ethanol from crop straws, low straw utilization rate, high energy consumption, high production cost, insufficient comprehensive utilization of resources, immature production technology and difficult industrialization, etc., and provide a A practical and feasible industrial method for producing ethanol from crop straws and maximizing the comprehensive utilization of resources

Method used

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  • Method for industrially producing ethyl alcohol through crop straw
  • Method for industrially producing ethyl alcohol through crop straw
  • Method for industrially producing ethyl alcohol through crop straw

Examples

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Embodiment 1

[0041] A method for the industrial production of ethanol using crop stalks, comprising the steps of:

[0042] (1) Pretreatment: Add the crushed crop straw and water to the pretreatment reactor at a ratio of 1:3, control the temperature at 194°C and the pressure at 1.38MPa for 52 minutes to obtain the pretreated material;

[0043](2) Enzymolysis: The material obtained after the pretreatment in step (1) is introduced into the enzymolysis tank, and is cooled by heat exchange with the next batch of unpretreated straw and water mixture, and recovered at the same time Heat energy, use sodium hydroxide to adjust the pH to 4.4, then add cellulase for enzymatic hydrolysis, the enzymatic hydrolysis temperature is 50°C, and the enzymatic hydrolysis time is 48h;

[0044] (3) Fermentation: import the material after enzymolysis in step (2) into a fermenter, control the fermentation temperature to 38°C, add common Saccharomyces cerevisiae, and ferment for 120 hours to produce ethanol, wherei...

Embodiment 2

[0050] A method for the industrial production of ethanol using crop stalks, comprising the steps of:

[0051] (1) Pretreatment: Add the crushed crop straw and water to the pretreatment reactor at a ratio of 1:5, control the temperature at 150°C and the pressure at 0.48MPa for 60 minutes to obtain the pretreated material;

[0052] (2) Enzymolysis: The material obtained after the pretreatment in step (1) is introduced into the enzymolysis tank, and is cooled by heat exchange with the next batch of unpretreated straw and water mixture, and recovered at the same time Heat energy, use calcium hydroxide to adjust the pH to 4.7, then add cellulase, cellobiase and xylanase for enzymolysis, the enzymolysis temperature is 50°C, and the enzymolysis time is 72h;

[0053] (3) Fermentation: import the material after enzymolysis in step (2) into a fermenter, control the fermentation temperature to 34°C, add genetically engineered Saccharomyces cerevisiae, and ferment for 96 hours to produce ...

Embodiment 3

[0059] A method for the industrial production of ethanol using crop stalks, comprising the steps of:

[0060] (1) Pretreatment: Add the crushed crop straw and water to the pretreatment reactor at a ratio of 1:6, control the temperature at 208°C and the pressure at 1.85MPa to react for 27 minutes to obtain the pretreated material;

[0061] (2) Enzymolysis: The material obtained after the pretreatment in step (1) is introduced into the enzymolysis tank, and is cooled by heat exchange with the next batch of unpretreated straw and water mixture, and recovered at the same time Heat energy, use sodium hydroxide to adjust the pH to 4, then add cellulase, cellobiase, and laccase for enzymolysis, the enzymolysis temperature is 48°C, and the enzymolysis time is 48h;

[0062] (3) Fermentation: import the material after enzymatic hydrolysis in step (2) into a fermenter, control the fermentation temperature to 42°C, add genetically engineered Saccharomyces cerevisiae, and ferment for 86 ho...

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Abstract

The invention discloses a method for industrially producing ethyl alcohol through crop straw. The method includes the following steps of pulverizing the crop straw, adding the pulverized crop straw and water into a preprocessing reactor in proportion to be preprocessed, guiding the materials into an enzymolysis tank, conducting cooling, adjusting the pH, adding an enzyme preparation for enzymolysis, guiding the materials into a fermentation tank, adding yeast for ethyl alcohol fermentation production, guiding the materials into a distilling device to be distilled to obtain ethyl alcohol and waste slag liquid, inoculating high-temperature activated sludge to the waste slag liquid for anaerobic fermentation to obtain biogas and digestive slag liquid, making the biogas combusted to generate vapor or used as a production raw material and supplied outward to an urban gas pipe network, squeezing the digestive slag liquid to obtain clear liquid and solid slag, discharging the clear liquid after the clear liquid is processed to reach the standard, combusting the solid slag to generate vapor, and reusing the vapor in the steps of the method. The whole method is advanced in process, high inethyl alcohol yield, sufficient in raw material utilization, low in cost and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of producing fuel ethanol by microbial fermentation of cellulose stalks, and in particular relates to a method for industrially producing ethanol by using crop stalks. Background technique [0002] At present, fossil fuel resources are continuously depleted, greenhouse gas emissions have seriously affected the living environment, and environmental pollution such as smog is becoming more and more serious. Therefore, the development and utilization of clean and renewable resources has attracted widespread attention. Biomass energy such as ethanol and butanol is considered to be the best substitute for traditional fossil fuels. At present, the production of biomass energy such as ethanol mainly uses grain as raw material, but there are problems such as high production cost and limited supply of raw materials. [0003] Cellulose straw is a kind of lignocellulosic waste in my country, with a large annual output....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P7/10C12P5/02
CPCC12P5/023C12P7/10C12P19/14C12P2201/00Y02E50/10Y02E50/30
Inventor 李秋园代淑梅
Owner ZHONGRONG TECH CORP LTD
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