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Method for producing butanol by hydrolyzing and fermenting waste crops rich in hemicellulose

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

Inactive Publication Date: 2010-04-21
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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Abstract

The invention discloses a method for producing butanol by hydrolyzing and fermenting waste crops rich in hemicellulose, belongs to bio-energy production by biomass fermentation and provides a method for producing the butanol by hydrolyzing and fermenting through acetic acid pretreatment by using biomasses rich in the hemicellulose as raw materials. The method comprises the following steps: mixing and hydrolyzing the raw materials; adding acetic acid to a reaction mixed solution of crop wastes rich in the hemicellulose biomasses and water; and controlling the temperature and the time to hydrolyze and ferment. In the method, the acetic acid is applied to pretreat and hydrolyze the hemicellulose, and the acetic acid in hydrolysis liquid can be utilized by fermentation thalli, thereby overcoming the defects such as overhigh salt content of sulfuric acid hydrolysis and environmental pollution by post-treated wastes.

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 Applications(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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