Method for producing butanol by hydrolysis and fermentation of waste crops rich in hemicellulose

A technology of hemicellulose and crops, applied in the field of biomass fermentation to produce bioenergy, can solve problems such as environmental protection treatment, achieve the effect of increasing conversion rate and reducing the amount of sugar used

Inactive Publication Date: 2012-02-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, in the process of producing butanol by hydrolysis and fermentation of cellulose, sulfuric acid is used for hydrolysis, which causes the problem of environmental protection in the later stage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Sweet sorghum slag is hydrolyzed with acetic acid, and the hydrolyzate is fermented to produce solvent acetone butanol ethanol (ABE).

[0044] The production steps include:

[0045] 1. Collection and processing of raw materials

[0046] For the sweet sorghum bagasse, sweet corn bagasse, bagasse and corncobs after juicing, mechanically crush them to 5 cm particles or less in length, and take the absolute dry (dried at 105°C overnight after sampling) biomass quality as a reference basis, and the solid-liquid ratio At 1:5, the unit is kg / L; the amount of acetic acid added is 2 g / L (the amount of acetic acid added is based on the amount of water added in the reaction mixture).

[0047] 2. Hydrolysis

[0048] Put the substances in step 1 into a high-pressure reactor with a cooling device, use a temperature of 170°C and a reaction hydrolysis retention time of 10 minutes to hydrolyze the hemicellulose-rich biomass, dissolve acetic acid in the hydrolyzate and add the total am...

example 3

[0067] The basic process of Example 3 is the same as Example 1

[0068] 1. Collection and processing of raw materials

[0069] For the sweet corn dregs, mechanically pulverize them to a particle length of 5 cm or less. The solid-liquid ratio is 1:8 based on the absolute dry (dried at 105° C. overnight after sampling) biomass quality as a reference. The amount of acetic acid added is 5 g / L and the ratio is added.

[0070] 2. Hydrolysis

[0071] Put the substances in step 1 into a high-pressure reactor with a cooling device, use a temperature of 150°C and a reaction hydrolysis retention time of 60 minutes to hydrolyze the hemicellulose-rich biomass, dissolve acetic acid in the hydrolyzate and add the total amount of acetic acid The total sugar concentration was 13 g / L, the total amount of furanose was 3.5 g / L, and the total sugar concentration was at or close to 45 g / L.

[0072] 7. Culture medium preparation

[0073] Separating the solid and liquid of the hydrolyzate in step...

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PUM

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Abstract

The invention discloses a method for producing butanol by hydrolyzing and fermenting waste agricultural crops rich in hemicellulose. The invention belongs to the production of bioenergy by biomass fermentation, and provides a method for solvent fermentation production that takes hemicellulose-rich biomass as raw material and undergoes acetic acid pretreatment. Method for producing butanol by hydrolysis and fermentation. The technical scheme of the present invention: mixed hydrolysis: add acetic acid to the reaction mixture of crop waste rich in hemicellulose biomass and water, and control the temperature and time to carry out hydrolysis and fermentation. The present invention uses acetic acid as a pretreatment to hydrolyze hemicellulose, and the acetic acid in the hydrolyzed solution can be utilized by fermentation cells, avoiding the disadvantages such as high salt content in sulfuric acid hydrolysis and post-treatment waste being unfriendly to the environment.

Description

technical field [0001] The invention belongs to biomass fermentation to produce bioenergy, and the invention relates to the production of solvent acetone, butanol and ethanol by using agricultural waste rich in hemicellulose and pressing residue waste in the sugar industry, acetic acid hydrolysis, and clostridia fermentation. Background technique [0002] The fermentation history of acetone butanol can be traced back to the 19th century. It was an important production method of acetone, an important smokeless explosive in World War I and World War II. With the great development of the petroleum industry, it gradually declined. The fermentation method was basically eliminated in the 1990s. Replaced by petrochemical methods of petrochemical technology. Due to the non-renewability of fossil energy and the increasingly urgent environmental pressure, people have once again seen the many advantages of producing solvents by fermentation. However, traditional fermentation methods u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/16C12R1/145
Inventor 谭天伟张涛杜娜
Owner BEIJING UNIV OF CHEM TECH
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