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Ultrasonic auxiliary purification method of xylose in eucalyptus hot water prehydrolysis liquid

A purification method and technology of pre-hydrolyzed liquid are applied in the directions of sugar production, xylose production, sugar production, etc., which can solve the problems of difficult removal of fermentation inhibitors, low xylose loss rate and high production cost, and avoid lignin Low removal rate, improve purification efficiency, and reduce the effect of supplementary amount

Active Publication Date: 2018-08-17
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to effectively remove organic soluble impurities such as lignin and furfural in the hot water prehydrolyzate of eucalyptus, and realize high-value utilization of the hot water prehydrolyzate, the present invention provides a low xylose loss rate and high lignin removal rate Prehydrolyzate purification process to solve the problems of complex organic components, low xylose purity, difficult removal of fermentation inhibitors and high production costs in eucalyptus hot water prehydrolyzate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] After the eucalyptus hot water prehydrolyzate was centrifuged, the supernatant was taken and purified according to the following steps:

[0041] (1) The hot water prehydrolyzate of eucalyptus was treated with ultrasonic wave and calcium hydroxide under the conditions of normal temperature and pH value of 3.9. Among them, the ultrasonic treatment instrument is JY-98ⅢN, the ultrasonic power is 110W, the ultrasonic time is 10min, the dosage of calcium hydroxide is 1.5%, and the treatment time is 60min.

[0042] (2) Centrifuge the hydrolyzed solution treated with ultrasonic wave and calcium hydroxide, and take the supernatant. Centrifugation speed 4500rpm, centrifugation time 5min.

[0043] (3) The supernatant obtained in the step (2) is subjected to a stage of activated carbon treatment at normal temperature and a pH value of 8.97. Wherein, the dosage of activated carbon is 1%, and the treatment time is 5 minutes.

[0044] (4) Centrifuge the hydrolyzed solution after a ...

Embodiment 2

[0050] (1) The hot water prehydrolyzate of eucalyptus was treated with ultrasonic wave and calcium hydroxide under the conditions of normal temperature and pH value of 3.9. Among them, the ultrasonic treatment instrument is JY-98ⅢN, the ultrasonic power is 110W, the ultrasonic time is 10min, the dosage of calcium hydroxide is 1.5%, and the treatment time is 45min.

[0051] (2) Centrifuge the hydrolyzed solution treated with calcium hydroxide, and take the supernatant. Centrifugation speed 4500rpm, centrifugation time 5min.

[0052] (3) The supernatant obtained in the step (2) is subjected to a stage of activated carbon treatment at normal temperature and a pH value of 8.97. Wherein, the dosage of activated carbon is 1.0%, and the treatment time is 5 minutes.

[0053] (4) Centrifuge the hydrolyzed solution after a section of activated carbon treatment, and take the supernatant. Centrifugation speed 4500rpm, centrifugation time 5min.

[0054] (5) The supernatant obtained in ...

Embodiment 3

[0059] (1) The hot water prehydrolyzate of eucalyptus was treated with ultrasonic wave and calcium hydroxide under the conditions of normal temperature and pH value of 3.9. Among them, the ultrasonic treatment instrument is JY-98ⅢN, the ultrasonic power is 120W, the ultrasonic time is 5min, the dosage of calcium hydroxide is 1.0%, and the treatment time is 10min.

[0060] (2) Centrifuge the hydrolyzed solution treated with calcium hydroxide, and take the supernatant. Centrifugation speed 4500rpm, centrifugation time 5min.

[0061] (3) The supernatant obtained in the step (2) is subjected to a stage of activated carbon treatment at normal temperature and a pH value of 7.73. Wherein, the dosage of activated carbon is 0.5%, and the treatment time is 5 minutes.

[0062] (4) Centrifuge the hydrolyzed solution after a section of activated carbon treatment, and take the supernatant. Centrifugation speed 4500rpm, centrifugation time 5min.

[0063] (5) The supernatant obtained in s...

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Abstract

The invention discloses a purification method of xylose in eucalyptus hot water pretreatment hydrolysate. In the purification method, a method of combination of physics, chemistry and biology of combination of ultrasonic treatment synergized with calcium hydroxide and ultrasonic treatment synergized with secondary activated carbon adsorption and laccase is adopted to treat the eucalyptus hot waterprehydrolysis liquid, dissolved organic matters such as lignin and furfural and impurities except the xylose in the prehydrolysis liquid are separated and removed to the maximum, and the purity of the xylose in the prehydrolysis liquid is improved, so that the problems of low purity of the xylose, difficulty in removal of fermentation inhibitors and high production cost in the subsequent xylose high-value use process are solved, the utilization value of the eucalyptus hot water prehydrolysis liquid is increased, and high-value utilization of hemicellulose components of broad-leaved woods suchas eucalyptus is realized.

Description

technical field [0001] The invention relates to a hydrolyzate purification method, in particular to a eucalyptus hot water pre-hydrolyzate purification method combining chemistry, physics and biology, and belongs to the field of biological refining. Background technique [0002] In recent years, the market demand for dissolving pulp has been increasing year by year. In the process of producing hardwood dissolving pulp by kraft method, hydrothermal pretreatment is generally carried out to dissolve part of the hemicellulose, so as to reduce the component separation process in the subsequent section. Reduced chemical consumption, improved dissolving pulp quality. During the production process of prehydrolyzed kraft dissolving pulp, a large amount of prehydrolyzed liquid will be produced, the moisture content in the prehydrolyzed liquid is high (>90%), and the sugar content of various hemicelluloses is also high, but various hemicelluloses The calorific value of plain sugar ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00
CPCC13K13/002
Inventor 陈嘉川杨桂花吉兴香董吉冉
Owner QILU UNIV OF TECH
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