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Method for purifying, reclaiming and condensing sugar in lignocellulose prehydrolysis liquid

A technology of lignocellulose and pre-hydrolysate, which is applied in the production of sugar, sugar production, glucose production, etc., to achieve the effects of increasing concentration, easy industrialized continuous production, and simple operation

Active Publication Date: 2010-07-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although microbial pretreatment can detoxify the inhibitors in the prehydrolyzate to a certain extent, microorganisms can also use various sugars in the prehydrolyzate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: a kind of method of purifying, reclaiming and concentrating sugar in lignocellulose prehydrolyzate comprises the steps:

[0019] (1) The lignocellulose prehydrolyzate obtained through dilute acid pretreatment (xylose 80g / L, glucose 20g / L, arabinose 10g / L, mannose 1g / L, galactose 1g / L, formic acid 5g / L , acetic acid 20g / L, levulinic acid 4g / L, furfural 40g / L, 5-hydroxymethylfurfural 5g / L, pH3.0) enter the microfiltration module through the feed pump to remove suspended impurities. The internal pressure of the microfiltration module is 0.1-0.2MPa, the temperature is 25°C, and the pore size is about 0.45 microns.

[0020] (2) The permeated liquid obtained in step (1) enters the feed liquid tank, and then pressurized by the feed pump to 26.5L.m -2 .h -1 The membrane flux passes through the flat polyamide nanofiltration membrane module with a molecular weight cut-off of 90Da. At the same time, deionized water is continuously added to the feed tank, and the wa...

Embodiment 2

[0021] Embodiment 2: a kind of method of purifying, reclaiming and concentrating the sugar in the lignocellulose prehydrolyzate comprises the steps:

[0022] (1) The lignocellulose prehydrolyzate obtained after steam explosion pretreatment (xylose 10g / L, glucose 50g / L, arabinose 1g / L, mannose 6g / L, galactose 3g / L, formic acid 1g / L L, acetic acid 10g / L, levulinic acid 8g / L, furfural 1g / L, 5-hydroxymethylfurfural 20g / L, pH3.0) enter the microfiltration module through the feed pump to remove suspended impurities. The internal pressure of the microfiltration module is 0.1-0.16MPa, the temperature is 25°C, and the pore size is about 0.45 microns.

[0023] (2) The permeated liquid obtained in step (1) enters the feed liquid tank, and then pressurized by the feed pump to 39.8L.m -2 .h -1 The membrane flux passes through the flat polyamide nanofiltration membrane module with a molecular weight cut-off of 150Da. At the same time, deionized water is continuously added to the feed tank...

Embodiment 3

[0024]Embodiment 3: a kind of method of purifying, reclaiming and concentrating sugar in lignocellulose prehydrolyzate comprises the steps:

[0025] (1) The lignocellulose prehydrolyzed solution (xylose 30g / L, glucose 15g / L, arabinose 0.3g / L, mannose 0.6g / L, galactose 0.3g / L) obtained by pretreatment with organic solvents such as alcohol , formic acid 0.3g / L, acetic acid 5g / L, levulinic acid 0.6g / L, furfural 4g / L, 5-hydroxymethylfurfural 0.7g / L, pH3.0) enter the microfiltration module through the feed pump to remove Suspended impurities. The internal pressure of the microfiltration module is 0.1-0.16MPa, the temperature is 25°C, and the pore size is about 0.45 microns.

[0026] (2) The permeated liquid obtained in step (1) enters the feed liquid tank, and then pressurized by the feed pump to 39.8L.m -2 .h -1 The membrane flux passes through the flat polyamide nanofiltration membrane module with a molecular weight cut-off of 150Da, until the volume of the retentate is concen...

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Abstract

The invention relates to a method for reclaiming and condensing sugar and removing toxicity inhibitors in lignocellulose prehydrolysis liquid by the applied nanofiltration technology. The method is realized by the following scheme: the pH value of the lignocellulose prehydrolysis liquid is firstly adjusted to 2.0-5.0, and the filtration pretreatment is carried out to remove suspended impurities; and then a filtration membrane is used for condensing sugar and remove inhibitors, the sugar of glucose, xylose and the like is trapped by the nanofiltration membrane, the weakly acidic inhibitors (formic acid, acetic acid, levulinic acid and the like) and the furfural inhibitors (furfural, 5-hydroxymethyl furfural and the like) continually penetrate through the nanofiltration membrane, the various inhibitors in the prehydrolysis liquid are removed, and the sugar in the prehydrolysis liquid is condensed to realize the purification, reclaiming and condensation of the sugar in the prehydrolysis liquid, so that the fermentability of the sugar is improved. The invention has the advantages of simple and safe operation, high efficiency and energy saving, and facilitates the continuous production; the nanofiltration has effects of purification, reclaiming and condensation; and the method can realize the industrial production.

Description

field of invention [0001] The invention relates to a method for refining sugar in lignocellulose prehydrolyzate, in particular to the method of using nanofiltration technology to recover and concentrate sugar in lignocellulose prehydrolyzate, and to remove toxic inhibitors in the prehydrolyzate method. Background technique [0002] Lignocellulose is a renewable resource with a wide range of sources and low price in nature, and its main components are cellulose, hemicellulose and lignin. Bioconversion of sugar polymers in lignocellulose to produce biofuels or bio-based chemicals is an effective way for comprehensive utilization of lignocellulose. However, due to the complex structure and composition of lignocellulose, it must be pretreated to enable enzymes to hydrolyze it into fermentable sugars, which can then be fermented by microorganisms to produce various chemicals. There are many methods for lignocellulose pretreatment, including physical, chemical, physicochemical, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K1/04C13K13/00
Inventor 万印华齐本坤罗建泉陈向荣伊守亮沈飞苏仪
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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