A method for enriching organic acid dilute solution by supporting liquid membrane electrodialysis

A technology supporting liquid membranes and organic acids, applied in the field of electrodialysis, can solve the problems of decreased purity of recovered liquid, large water electroosmosis, and reduced current efficiency, and achieve high mass transfer efficiency, high separation, and high current efficiency. Effect

Active Publication Date: 2019-05-17
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key to electrodialysis is the ion exchange membrane. The ion exchange membranes used to enrich dilute organic acid solutions by electrodialysis were all commercial membranes and lacked pertinence. Therefore, there were two serious deficiencies. The electroosmotic amount of water in the process is relatively large, resulting in a low concentration of the concentrated solution, a decrease in the utilization value of the recovered solution, and a corresponding decrease in current efficiency; the second is that the selectivity in the electrodialysis process is not high, especially for When multiple components coexist in the dilute organic acid solution, the purity of the recovered solution decreases

Method used

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  • A method for enriching organic acid dilute solution by supporting liquid membrane electrodialysis

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Experimental program
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Effect test

Embodiment 1

[0018] Such as figure 1 As shown, the electrodialyzer is a cuboid container, the left side wall is the electrode plate connected to the negative pole of the DC power supply, which is called the cathode plate (1), and the right side wall is the electrode plate connected to the positive pole of the DC power supply, called the anode plate ( 7), there are two supporting liquid membranes inside the electrodialyzer, the supporting liquid membrane on the left is a cationic supporting liquid membrane (3), and the supporting liquid membrane on the right is an anionic supporting liquid membrane (5). The anion-supporting liquid membrane (5) is prepared by dissolving tri-n-octylamine in xylene to obtain a solution of tri-n-octylamine with a mass fraction of 5% and attaching it to a polydimethylsiloxane film. Before use, use a mass fraction of 5% soaked in hydrochloric acid for 12 hours; the cation-supported liquid membrane (3) is attached to the 3% bis(2-ethylhexyl) phosphate solution obt...

Embodiment 2

[0024] Such as figure 1 As shown, the electrodialyzer is a cuboid container, the left side wall is the electrode plate connected to the negative pole of the DC power supply, which is called the cathode plate (1), and the right side wall is the electrode plate connected to the positive pole of the DC power supply, called the anode plate ( 7), there are two supporting liquid membranes inside the electrodialyzer, the supporting liquid membrane on the left is a cationic supporting liquid membrane (3), and the supporting liquid membrane on the right is an anionic supporting liquid membrane (5). The anion-supporting liquid membrane (5) is prepared by dissolving tri-n-octylamine in xylene to obtain a solution of tri-n-octylamine with a mass fraction of 10% and attaching it to a polydimethylsiloxane film. Before use, use a mass fraction of 15% soaked in hydrochloric acid for 12 hours; the cation-supported liquid membrane (3) is attached to the 18% bis(2-ethylhexyl) phosphate solution ...

Embodiment 3

[0030] Such as figure 1 As shown, the electrodialyzer is a cuboid container, the left side wall is the electrode plate connected to the negative pole of the DC power supply, which is called the cathode plate (1), and the right side wall is the electrode plate connected to the positive pole of the DC power supply, called the anode plate ( 7), there are two supporting liquid membranes inside the electrodialyzer, the supporting liquid membrane on the left is a cationic supporting liquid membrane (3), and the supporting liquid membrane on the right is an anionic supporting liquid membrane (5). The anion-supporting liquid membrane (5) is prepared by dissolving tri-n-octylamine in xylene to obtain a solution of tri-n-octylamine with a mass fraction of 7% and attaching it to a polydimethylsiloxane film. Before use, use a mass fraction of 10% soaked in hydrochloric acid for 12 hours; the cation-supported liquid membrane (3) is attached to a 10% bis(2-ethylhexyl) phosphate solution obt...

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Abstract

An anionic supported liquid membrane is produced through adhering a xylene solution of tri-n-octylamine to a polydimethylsiloxane membrane and a cationic supported liquid membrane is produced through adhering a hydrogenated kerosene solution of di(2-ethylhexyl)phosphate to a micro-porous polypropylene membrane against the disadvantages of large water electroosmosis amount and low selectivity of traditional electrodialysis technologies for enriching the diluted organic acid solution, and the two supported liquid membranes have the advantages of high mass transfer rate and high electrical efficiency when substituting traditional solid membranes and used in the electrodialysis enrichment of the diluted organic acid solution.

Description

technical field [0001] The invention belongs to electrodialysis technology, in particular to a method for enriching organic acid dilute solution by supporting liquid membrane electrodialysis. Background technique [0002] Organic acids (including formic acid, acetic acid, and propionic acid) are widely used as the main raw materials in the chemical industry, so the treatment of dilute solutions of organic acids has become a major problem in the treatment of dilute solutions in the environment. For the treatment of dilute organic acid solutions, on the one hand, it can effectively reduce environmental pollution, and on the other hand, it can recover organic acids to achieve full and effective use of resources. [0003] Electrodialysis is an electrochemical separation process that uses ion exchange membranes and a direct current electric field to separate electrolyte components from aqueous solutions. According to the charge properties of ions, ion exchange membranes can be d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/48C25B3/00
CPCB01D61/48C25B3/00
Inventor 沈剑
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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