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Method for enzymatically producing bioethanol using cellulosic biomass as starting material

A technology of bioethanol and a production method, which is applied in the field of producing ethanol and can solve problems such as load increase

Pending Publication Date: 2020-07-07
KAWASAKI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conversely, if the concentration of the slurry is lowered for ease of handling, the sugar concentration of the saccharified solution will decrease, and the load on the distillation step following the fermentation step will further increase.

Method used

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  • Method for enzymatically producing bioethanol using cellulosic biomass as starting material
  • Method for enzymatically producing bioethanol using cellulosic biomass as starting material
  • Method for enzymatically producing bioethanol using cellulosic biomass as starting material

Examples

Experimental program
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Effect test

Embodiment approach 1

[0086] image 3 A diagram illustrating the ethanol production method of Embodiment 1 is shown. In the method for producing ethanol according to Embodiment 1, steps B to E are implemented in the mixing tank 21 , the saccharification tank 22 , and the fermentation tank 23 , respectively. In a steady state, a part of the distilled ethanol obtained from the distillation apparatus 24 is supplied to the tank 21 in which the step B is carried out. The added distilled ethanol is then recovered by the distillation unit 24 .

Embodiment approach 2

[0088] Figure 4 A figure explaining the ethanol production method of Embodiment 2 is shown. The ethanol production method of Embodiment 2 is the same as Embodiment 1 except that Step C (saccharification step) and Step E (fermentation step) are continuously performed in one tank (saccharification fermentation tank 32 ).

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Abstract

The present invention addresses the problem of providing a method for producing bioethanol using a lignocellulosic biomass as a starting material, wherein the ethanol concentration of a fermented liquid obtained in a fermentation step can be increased and the distillation load can be reduced without requiring any special equipment in solubilizing cellulose contained in the biomass by enzymatic hydrolysis. When hemicellulose is removed from a cellulosic biomass and the resultant solid residue is mixed with an aqueous solution containing a cellulose hydrolytic enzyme in a reaction container, theconcentration of ethanol is controlled to 3-6 mass% inclusive. Thus, the growth of miscellaneous microorganisms can be prevented during the hydrolysis of the cellulose and the ethanol concentration can be increased when a saccharified solution is subjected to ethanol fermentation. As a result, the distillation load is reduced. The ethanol added at the hydrolysis can be recovered in the step for distilling the alcohol fermented liquid and then reused.

Description

technical field [0001] The present invention relates to a method for producing bioethanol by hydrolyzing cellulosic biomass with a hydrolytic enzyme, and the method is used for producing ethanol (bioethanol) from sugars by alcoholic fermentation. Background technique [0002] As part of biomass utilization, attempts have been made to produce saccharified liquid by decomposing cellulose or hemicellulose, which are main components of plants, and to subject sugar to alcoholic fermentation to obtain ethanol. Here, the obtained ethanol is planned to be partially mixed mainly in automobile fuel as a fuel use, or to be used as a substitute fuel for gasoline. [0003] The main components of plants include cellulose (polymer of glucose which is C6 sugar composed of 6 carbons), hemicellulose (polymer of C5 sugar and C6 sugar composed of 5 carbons), lignin , starch, and ethanol are produced by fermentation of microorganisms such as yeasts using sugars such as C5 sugars, C6 sugars, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10C12P19/02C12N9/24
CPCC12P7/06C12P7/10C12P19/02C12P19/14Y02E50/10C12N9/2437C12R2001/865C12M21/04C12M27/02C12N9/24C12P2201/00
Inventor 西野毅和泉宪明田尻浩范辻田章次小田明日香政本学藁谷友祐
Owner KAWASAKI HEAVY IND LTD
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