Method for preparing lactic acid and ethanol by fermentation of furfural residues

A furfural residue and furfural technology, applied in the field of preparing lactic acid and ethanol, can solve the problems of biomass conversion and fermentation nutrient waste, reducing system efficiency and economy, low lactic acid concentration and difficulty in economical recycling, etc., and achieve high cellulose utilization and Production efficiency, low price, and the effect of speeding up recycling

Inactive Publication Date: 2011-11-16
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lactic acid produced by ethanol production is difficult to economically reuse because of its low concentration, resulting in waste of biomass conversion and fermentation nutrients
It is difficult to use yeast after ethanol fermentation. For yeast that requires a certain amount of sugar and nutrient input, this means that the efficiency and economy of the system will be reduced

Method used

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  • Method for preparing lactic acid and ethanol by fermentation of furfural residues

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) 100L aqueous solution of furfural slag (the mass ratio of furfural slag and water is 1: 10) is neutralized with solid NaOH until the pH value of the aqueous solution of furfural slag is 5, then the neutralized aqueous solution of furfural slag is centrifugally filtered to obtain Furfural residue neutralizes filtrate and furfural filter residue.

[0030] 2) Add 7.5g of KH to the 15L furfural slag obtained in step 1) and neutralize the filtrate 2 PO 4 , 7.5g MgSO 4 ·7H 2 O, 1kg yeast, under the culture condition of pH value 4.5, culture temperature 30 ℃, adaptive culture 24h, get the yeast strain.

[0031] At the same time, add 7.5g of KH to the 15L furfural slag obtained in step 1) and neutralize the filtrate 2 PO 4 , 7.5g MgSO 4 ·7H 2 O, 1.5g NaCl, 300g CaCO 3 , 1kg of thermophilic lactic acid bacteria was adaptively cultured for 36 hours under the culture conditions of pH 6.0 and culture temperature 32° C. to obtain lactic acid bacteria strains.

[0032] 3) T...

Embodiment 2

[0037] 1) 100L aqueous solution of furfural slag (the mass ratio of furfural slag and water is 1: 10) is neutralized with solid NaOH until the pH value of the aqueous solution of furfural slag is 5, then the neutralized aqueous solution of furfural slag is centrifugally filtered to obtain Furfural residue neutralizes filtrate and furfural filter residue.

[0038] 2) Add 7.5g of KH to the 15L furfural slag obtained in step 1) and neutralize the filtrate 2 PO 4 , 7.5g MgSO 4 ·7H 2 O, 1kg yeast, under the culture condition of pH value 4.5, culture temperature 30 ℃, adaptive culture 24h, get the yeast strain.

[0039] At the same time, add 7.5g of KH to the 15L furfural slag obtained in step 1) and neutralize the filtrate 2 PO 4 , 7.5g MgSO 4 ·7H 2 O, 1.5g NaCl, 300g CaCO 3 , 1kg of thermophilic lactic acid bacteria was adaptively cultured for 36 hours under the culture conditions of pH 6.0 and culture temperature 32° C. to obtain lactic acid bacteria strains.

[0040] 3)...

Embodiment 3

[0046] Under the same steps and conditions, the furfural filter residues with absolute dry weight of 5%, 7% and 9% were used for fermentation, and the specific steps were as follows:

[0047] 1) 100L aqueous solution of furfural slag (the mass ratio of furfural slag and water is 1: 10) is neutralized with solid NaOH until the pH value of the aqueous solution of furfural slag is 5, then the neutralized aqueous solution of furfural slag is centrifugally filtered to obtain Furfural residue neutralizes filtrate and furfural filter residue.

[0048] 2) Add 7.5g of KH to the 15L furfural slag obtained in step 1) and neutralize the filtrate 2 PO 4 , 7.5g MgSO 4 ·7H 2 O, 1kg yeast, under the culture condition of pH value 4.5, culture temperature 30 ℃, adaptive culture 24h, get the yeast strain.

[0049] At the same time, add 7.5g of KH to the 15L furfural slag obtained in step 1) and neutralize the filtrate 2 PO 4 , 7.5g MgSO 4 ·7H 2 O, 1.5g NaCl, 300g CaCO 3 , 1kg of thermop...

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Abstract

The invention provides a method for preparing lactic acid and ethanol by fermentation of furfural residues. The method comprises the following steps: 1) neutralizing a furfural residue aqueous solution with solid base and then filtering so as to obtain furfural residue filtrate and furfural filter residue; 2) neutralizing the filtrate with the furfural residues so as to respectively carry out adaptive culture on lactic acid bacteria and yeast; and 3) putting the furfural filter residue which is obtained from the step 1) and the lactic acid bacteria and yeast which are obtained from the step 2) into a fermentation tank for synchronous saccharification fermentation so as to obtain lactic acid and ethanol. According to the invention, a mixed bacteria fermentation method has higher cellulose utilization and production efficiency as compared with single bacteria fermentation; and simultaneously, the consumption amount of a reaction reagent can be saved, production cost is reduced, and the recoveries of equipment and cost are accelerated.

Description

technical field [0001] The invention relates to the field of biomass chemistry and chemical industry, in particular to a method for preparing lactic acid and ethanol by fermenting furfural residue. Background technique [0002] Lactic acid is a naturally occurring organic acid, which is a colorless transparent or light yellow syrupy viscous liquid, almost odorless or slightly smelly with fatty acid, and has a sour taste. Lactic acid can be divided into industrial grade, food grade and pharmacopoeia grade. The industrial production of lactic acid mainly includes chemical synthesis, enzymatic and microbial fermentation, and fermentation is mainly used in my country. Lactic acid is produced by microbial fermentation, and specific L-lactic acid, D-lactic acid or DL-lactic acid can be obtained through strain selection and selection of culture conditions. Lactic acid is widely used in food industry, pharmaceutical industry, cosmetic industry, biodegradable materials, cigarette i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P39/00C12P7/10C12P7/56C12P19/14C12R1/645C12R1/225
CPCY02E50/16Y02E50/10
Inventor 蒋建新唐勇菅红磊卜令习赵丹青朱莉伟
Owner BEIJING FORESTRY UNIVERSITY
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