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Method for liquefying surplus solid residue in fermentation of cellulosic ethanol

A technology for solid residue and ethanol fermentation, which is used in the preparation of liquid carbonaceous fuels, liquid hydrocarbon mixtures, and the petroleum industry. The effect of liquefaction rate and energy consumption reduction

Active Publication Date: 2014-04-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no research report on the pyrolysis and liquefaction of solid residues after cellulosic ethanol fermentation.
In addition, under normal circumstances, in order to obtain more liquid products, the temperature of biomass pyrolysis and liquefaction should be between 450-700 °C, and for biomass raw materials with high lignin content, due to its complex structure and stable linkage, More difficult to break, so it requires a higher temperature to liquefy and consumes a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The fermented solid residue of reed after hot water pretreatment, enzymatic hydrolysis, saccharification and fermentation to produce ethanol has been determined to have a lignin content of 80%, and the residue is put into a high-pressure container. That is, add absolute ethanol at a ratio of kilogram:liter to 1:20, then add catalyst aluminum chloride in an amount of 5% of the absolute dry weight of the solid residue, and react at a temperature of 260°C for 3 hours. After the reaction was completed, it was tested that the liquefaction rate of the solid residue reached 78%, while the liquefaction rate of the solid residue without a catalyst was 61.5%, and the liquid product contained more small molecular weight substances after the catalyst was liquefied.

Embodiment 2

[0020] The fermented solid residue of corn stalks pretreated by hot water, enzymatic hydrolysis, saccharification and fermentation to produce bioethanol, the lignin content was determined to be 65%, and the residue was put into a high-pressure container. , that is, kilogram: liter is 1:30, adding anhydrous propanol, and then adding catalyst aluminum chloride in an amount of 10% of the absolute dry weight of the solid residue, and reacting at a temperature of 300°C for 2h. After the reaction was completed, it was tested that the liquefaction rate of the solid residue reached 72%, while the liquefaction rate of the solid residue without catalyst was 64%, and the liquid product contained more small molecular weight substances after the catalyst was liquefied.

Embodiment 3

[0022] The fermented solid residue of cassava after pretreatment with dilute sulfuric acid, enzymatic hydrolysis, saccharification and fermentation product ethanol has a lignin content of 70%. The residue is put into a high-pressure container. That is, add absolute ethanol at a ratio of kilogram:liter to 1:10, then add catalyst aluminum sulfate in an amount of 20% of the dry weight of the solid residue, and react at a temperature of 240°C for 4 hours. After the reaction was completed, the liquefaction rate of the solid residue reached 70% after testing, while the liquefaction rate of the solid residue without catalyst was 61.5%, and the liquid product contained more small molecular weight substances after the liquefaction was added with the catalyst.

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Abstract

The invention discloses a method for liquefying surplus solid residue in the enzymolysis saccharification and ethanol fermentation by adopting lignocellulose as a raw material. The method is characterized in that the solid residue is liquefied in a high-pressure vessel in the presence of a catalyst and an organic solvent, wherein the organic solvent is absolute ethyl alcohol, anhydrous propyl alcohol or absolute butanol, and the catalyst is aluminum chloride, aluminum sulfide and zinc sulfide. The catalyst which is specially selected by an inventor is added in the method, so that the liquefying temperature is effectively lowered, the liquefying rate of the fermented solid residue and the residue degrading degree can be improved, and more liquid products with smaller molecular weight can be generated. The method can be widely used for liquefying the residue produced by fermenting the biomass fuel ethanol and lignocellulose-rich biomass raw material and has the advantages of low liquefying temperature, simplicity in process, high efficiency and the like, and the raw materials are easily obtained.

Description

technical field [0001] The invention relates to a method for liquefying the remaining solid residue after fermentation, in particular to a method for liquefying the remaining solid residue after enzymatic saccharification and ethanol fermentation using lignocellulose as raw material. Background technique [0002] With the increasing scarcity of traditional fossil fuels such as oil and coal, and the increasing greenhouse effect, the development of renewable new resources and clean energy has become the focus of the world. Biomass resources have been paid more and more attention due to their characteristics of being renewable, abundant and available in large quantities. Bioconversion of biomass to produce liquid fuels (such as ethanol) and bulk chemicals is of great significance to alleviating resource and energy crises in human society and environmental protection. [0003] The production of fuel ethanol from biomass through bioconversion generally goes through three main st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00C10L1/00
Inventor 赵建李雪芝鲁杰
Owner SHANDONG UNIV
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