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Method for preparing xylose acid through electrodialysis desalination and acid transformation by one-step method

A technology of xylonic acid and electrodialysis, which is applied in the field of bipolar membrane electrodialysis treatment of bio-based xylose product liquid, product desalination, refining, and acid conversion to produce xylonic acid, which can solve complex operations and ion exchange methods. low production efficiency

Inactive Publication Date: 2016-12-07
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the whole cell catalyzes xylose to generate xylonic acid, the pH value of the biological reaction system will drop rapidly. In order to maintain production efficiency, alkaline substances must be added to stabilize the pH value and protect the catalytic activity of the cells. Therefore, the obtained product is xylonic acid Existing in the form of salt, it must be converted into xylonic acid products through desalination and acid conversion, while the conventional ion exchange method has low production efficiency and complicated operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 800mL of 73.28g / L sodium xylose solution to the salt chamber, add 800mL of 0.3mol / L sodium sulfate solution to the pole chamber, add 800mL deionized water to the acid chamber and alkali chamber respectively, and apply a DC power supply for reaction. The progress of the reaction was monitored with a conductivity meter. After 1 hour of reaction, the conductivity value of the solution in the salt chamber was stable. At this time, 1000 mL of 48.4 g / L xylose acid was produced in the acid chamber, and 500 mL of 0.78 g / L sodium xylose remained in the salt chamber. The recovery rate of xylonic acid was 93%, and the removal rate of sodium ion was 99.36%.

Embodiment 2

[0014] Add 500mL of 167.33g / L sodium xylose solution in the salt chamber, add 500mL of 0.3mol / L Na2SO4 solution in the pole chamber, add 500mL deionized water in the acid chamber and alkali chamber respectively, and add a direct current power supply to react. A conductivity meter monitors the progress of the reaction. After reacting for 1 hour, the conductivity value of the solution in the salt chamber remained stable. At this time, 89.72 g / L xylonic acid 800 mL was produced in the acid chamber, and 300 mL of 0.93 g / L sodium xylose remained in the salt chamber. The recovery rate of xylonic acid was 97%, and the removal rate of sodium ion was 99.67%.

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Abstract

The invention discloses a method for preparing xylose acid through electrodialysis desalination and acid transformation by a one-step method. The method comprises the following steps of treating xylose acid salts by bipolar membrane electrodialysis, and using an electric field as driving force to realize dialysis desalination and electrolyze the xylose acid salts at the same time so as to generate the xylose acid; and therefore, the effect of completing desalination and acid transformation by the one-step method so as to prepare the xylose acid is realized. The xylose acid salts (sodium, potassium and zinc) are used as raw liquid, after impurities of colloid and the like are removed through adsorption, bipolar membrane electrodialysis is adopted, and deionized water of which the resistivity is higher than 18 megohms is added to an acid chamber and an alkali chamber, and 0.1mol / L-0.5mol / L sodium sulphate is used as a conducting medium between a connecting film group and a film electrode; and xylose acid salt liquid is treated under the condition that the voltage is 15-20V, and the electric current is 0-10A, until the electrical conductivity of product liquid is reduced to 300ms / cm or below, and falls down no longer, the xylose acid product liquid is obtained. The desalinization ratio of the xylose acid salt raw liquid is higher than 99%, the conversion rate of sugar acid is higher than 97%, and the effect of preparing the xylose acid by the one-step method is realized. The method disclosed by the invention has the advantages of being simple to operate, high in production efficiency and low in cost.

Description

1. Technical field [0001] The invention relates to a method for preparing xylonic acid by electrodialysis desalination and acid conversion in one step, in particular to bipolar membrane electrodialysis treatment of bio-based xylose product liquid to realize product desalination, refining, and acid conversion to produce xylonic acid Technology. 2. Background technology [0002] Xylonic acid is a new bio-based product, which can be used as cement water reducer, concrete dispersant, oil well mud slow-release agent, leather tanning agent, pipeline scale inhibitor and metal rust remover. Energy food sour agent, ice-cooling fiber blending agent, etc. [0003] At present, the product concentration of whole-cell catalyzed xylose to produce xylonate can reach nearly 600g / L. When the whole cell catalyzes xylose to generate xylonic acid, the pH value of the biological reaction system will drop rapidly. In order to maintain production efficiency, alkaline substances must be added to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/02C07C51/42C07C59/105
CPCC07C51/02C07C51/42C07C59/105
Inventor 徐勇曹柔余世袁周雪莲周鑫
Owner NANJING FORESTRY UNIV
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