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Electrodialysis and chromatography combined process for preparing xylose

A combined process and electrodialysis technology, which is applied in the field of combined electrodialysis and chromatography, can solve the problems of large amount of running sugar, waste of resources, environmental pollution, etc., and achieve the effect of increasing removal rate, reducing environmental protection pressure, and reducing COD content

Active Publication Date: 2019-12-13
四川雅华生物有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the separation and purification treatment of hemicellulose hydrolyzate with electrodialysis, membrane filtration, simulated moving bed chromatographic separation device, multi-effect falling film evaporator, ion exchange column, etc. are disclosed in the above prior art documents, there are still the following Technical problems: 1. After separation and treatment, the waste water (high COD) produced will seriously pollute the environment and cause environmental pressure; 2. The amount of sugar running is large, resulting in waste of resources

Method used

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  • Electrodialysis and chromatography combined process for preparing xylose
  • Electrodialysis and chromatography combined process for preparing xylose
  • Electrodialysis and chromatography combined process for preparing xylose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A combined electrodialysis and chromatography process for preparing xylose, comprising the steps of:

[0074] 1) First-stage electrodialysis: pass the hemicellulose hydrolyzate into the first-stage electrodialysis system, and pass through the second-stage high-salt solution (when the electrodialysis system is used for the first time, pass through demineralized water. When electrodialysis During the normal operation of the system, that is, the second-stage electrodialysis system produces the second-stage high-salt liquid, stop feeding desalted water, and switch to the second-stage high-salt liquid), and through the action of the electrodialysis membrane, the first-stage high-sugar liquid is obtained liquid and the first high-salt liquid;

[0075] 2) Second-level electrodialysis: the first-level high-sugar solution obtained in step 1) is passed into the second-level electrodialysis system, and desalted water is passed through, and the second-level high-sugar solution is o...

Embodiment 2

[0082] On the basis of embodiment 1, further:

[0083] The hemicellulose hydrolyzate refers to the hemicellulose hydrolyzate obtained by hydrolyzing hemicellulose raw materials with sulfuric acid and performing pretreatments such as filtration, decolorization and ultrafiltration by using existing mature technologies. Wherein, in the hemicellulose hydrolyzate, the xylose content is 70-90 g / L, the sodium sulfate content is 20-22 g / L, and the sulfuric acid content is 20-25 g / L.

[0084] The ion-exchange column used in step 5) refers to an ion-exchange column including an outlet conductivity>0.5ms / cm or an outlet pH<3.

Embodiment 3

[0086] On the basis of embodiment 2, further:

[0087] Further, in step 1) in the first-stage electrodialysis system, the feed flow rate of the hemicellulose hydrolyzate is 40m 3 / h, the feed flow rate of the second high-salt liquid is 15m 3 / h; the voltage is 150V, the current is 100A, and the temperature is 40°C; the first-stage high-salt liquid discharge flow rate is 15m 3 / h, the discharge flow rate of the first high-sugar liquid is 40m 3 / h;

[0088] In the second-stage electrodialysis system in step 2), the feed flow rate of the first-stage high-sugar liquid is 40m 3 / h, desalted water feed flow rate is 15m 3 / h; the voltage is 150V, the current is 100A, and the temperature is 40°C; the discharge flow rate of the second-stage high-salt liquid is 15m 3 / h, the output flow rate of the second stage high sugar liquid is 40m 3 / h;

[0089] In the third-stage electrodialysis system in step 3), the feed flow rate of the second-stage high-sugar liquid is 40m 3 / h, desalt...

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Abstract

The invention discloses an electrodialysis and chromatography combined process for preparing xylose, and belongs to the technical field of xylose production. The process comprises: carrying out three-stage electrodialysis on hemicellulose hydrolysate to finally obtain a first-stage high-salt solution, a third-stage high-salt solution and a third-stage high-sugar solution; concentrating and desalting the third-stage high-salt solution, and making the concentrated and desalted third-stage high-salt solution and the third-stage high-sugar solution co-enter an ion exchange column chromatography process; and regenerating the ion exchange column to obtain a regenerated solution (containing alkali and sugar), carrying out dealkalization on the regenerated solution to obtain an alkali liquid and asugar liquid, recycling the alkali liquid in regeneration of the ion exchange column, concentrating and desalting the sugar liquid and the third-stage high-salt liquid, and carrying out chromatography again. According to the present invention, with the process, the removal rate of the impurities in a xylose solution is increased so as to improve the quality of the product, the third-stage high-salt solution and the regenerated solution are recycled so as to reduce the sugar loss and improve the economic benefits, and on the premise of improving of the quality of the xylose solution and the production efficiency, the COD content in sewage is reduced so as to reduce the environmental protection pressure.

Description

technical field [0001] The invention relates to a combined electrodialysis and chromatography process for preparing xylose, in particular to a combined electrodialysis and chromatography process for preparing xylose from hemicellulose hydrolyzate, and belongs to the technical field of xylose production. Background technique [0002] Hemicellulose is the main raw material for the production of xylose. In the process of preparing xylose from hemicellulose, the main processes include hydrolysis, decolorization, desalination, deacidification, evaporation, centrifugation and drying. The specific process of producing xylose is: using hemicellulose as raw material, adding sulfuric acid to the hemicellulose under heating conditions, the hemicellulose is hydrolyzed by sulfuric acid into xylose and other miscellaneous sugars, and at the same time, there is sulfuric acid in the hydrolyzate Sodium and sulfuric acid and other impurities; and before the centrifugation process, the generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00
CPCC13K13/002
Inventor 吴限智陈德水徐小荣莫世清王战龙
Owner 四川雅华生物有限公司
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