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Surfactant recovery technology for lignocellulose hydrolysate fermentation process

A technology of surfactant and lignocellulose, which is applied in the field of fuel ethanol production through fermentation process through the degradation of biomass raw materials, can solve the problems of complex process, high equipment investment cost, poor detoxification effect, etc., achieve wide application prospects, improve atomic The effect of utilization

Active Publication Date: 2016-12-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, water washing, physical and chemical detoxification consume a lot of water resources, equipment investment costs are high and the process is complicated, and the detoxification effect is poor and the loss of sugar is serious.

Method used

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  • Surfactant recovery technology for lignocellulose hydrolysate fermentation process
  • Surfactant recovery technology for lignocellulose hydrolysate fermentation process
  • Surfactant recovery technology for lignocellulose hydrolysate fermentation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Lignocellulose hydrolyzate model substance 20mL, containing glucose concentration 71g.L -1 , mixed inhibitors (phenol, guaiacol, vanillin, HMF, furfural, levulinic acid mixture) (2.0g.L -1 ), add 0.2g.mL -1 PEG-400 (no PEG added in the comparative example), adding yeast cell concentration 0.8*10 8 ~0.96*10 8 per mL, the pH value was adjusted to 4.3, placed in a shaker for shaking, and fermented at 33°C for 48 hours. Solid-liquid separation is carried out after fermentation, and the recovered yeast cells are directly used for the next fermentation. Glucose conversion rate and ethanol concentration were as figure 2 shown. It can be seen from the comparative data in the figure that when PEG is not added to the fermentation system, the glucose is hardly converted, and the yeast cells are almost completely dead, which cannot be recycled and reused. However, when PEG was added to the fermentation system, the glucose was completely converted 100% and obtained 32g.L -1 ...

Embodiment 2

[0033] Lignocellulose hydrolyzate model substance 20mL, containing glucose concentration 71g.L -1 , mixed inhibitors (phenol, guaiacol, vanillin, HMF, furfural, levulinic acid mixture) (2.0g.L -1 ), add 0.2g.mL -1 PEG-1000, add yeast cell concentration 0.8*10 8 ~0.96*108 per mL, the pH value was adjusted to 4.3 with sulfuric acid solution, placed in a shaker for shaking, and fermented at 33°C for 48 hours. After fermentation, solid-liquid separation is carried out, the upper liquid is distilled, extracted, and re-distilled, and the remaining liquid is surfactant, buffer, and the recovered yeast can be directly used in the next fermentation process (such as figure 1 ), add some new yeast. PEG-1000 and the recovered yeast were recycled 3 times and the results were as follows: image 3 shown. It can be seen from the figure that PEG-1000 can be recycled and reused, and the glucose conversion rate and ethanol concentration remain basically unchanged.

Embodiment 3

[0035] The experimental procedure is the same as in Example 2, except that 0.2g.mL is added -1 PEG-200, glucose conversion rate, ethanol yield and concentration data are shown in Table 1. It can be seen from the table that PEG-200 can be recycled and reused. After three cycles, the glucose is completely converted, and the ethanol concentration remains basically unchanged.

[0036] Table 1 Glucose conversion rate and ethanol concentration data

[0037]

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PUM

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Abstract

The invention provides a surfactant recovery technology for a lignocellulose hydrolysate fermentation process, and belongs to the field of biomass degradation fermentation production of fuel ethanol. According to the technology, detoxification treatment is not required to be performed on a lignocellulose hydrolysate subjected to thermochemical pretreatment such as acid hydrolysis or steam explosion, the pH value is directly regulated, a surfactant is added, brewer yeasts are added for ethanol fermentation, and then yeast cells are directly separated and recovered; enrichment of the surfactant, a fermentation inhibitor and a buffering agent is implemented at the same time of ethanol distillation; the fermentation inhibitor is extracted to implement coupling separation and recovery of the surfactant, the buffering agent and the fermentation inhibitor. The technology has the advantages that not only is the cyclic utilization efficiency of the yeasts improved, but also coupling recovery of the surfactant, the buffering agent and the fermentation inhibitor is implemented; relative to an ethanol distillation process, no energy consumption is added by surfactant recovery, a recovery process is simple, pollution is effectively reduced, the cost is lowered, and the industrialization process of cellulosic ethanol is further promoted.

Description

technical field [0001] The invention relates to the field of producing fuel ethanol through a fermentation process through the degradation of biomass raw materials, in particular to a surfactant recovery method for detoxifying lignocellulose hydrolyzate. Background technique [0002] With the depletion of fossil energy and the aggravation of environmental pollution, the development and utilization of renewable clean energy fuel ethanol has received widespread attention. Traditional ethanol fermentation uses sugar or starch as raw materials, both of which are the main sources of food. The production of fuel ethanol from grains has already constituted a threat to world food security, and it is imperative to find other raw materials to replace grains. Lignocellulose is the most abundant biomass resource in the world. The production of fuel ethanol from lignocellulose can not only effectively alleviate the energy crisis and reduce environmental pollution, but also meet the susta...

Claims

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Application Information

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IPC IPC(8): C08J11/08C07C41/34C07C43/11
CPCY02W30/62
Inventor 张宗超刘秀梅
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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