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Electrodialysis miscellaneous salt resource recycling device

An electrodialysis and recycling technology, applied in the field of electrodialysis, can solve the problems of lengthy acid-base process, uneconomical process, inability to directly process multi-component salts, etc., and achieve the effect of reducing energy consumption

Pending Publication Date: 2021-01-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although bipolar membrane electrodialysis has the above advantages, it still cannot directly process multi-component salts.
Taking miscellaneous salt in coal chemical industry as an example, it mainly contains NaCl and Na 2 SO 4 , the products of direct bipolar membrane electrodialysis are NaOH and HCl / H 2 SO 4 Mixed acids cannot be reused in one-step simultaneous salt separation and acid and alkali production
However, the process of preparing acid-base after crystallization of industrial miscellaneous salts is tedious and uneconomical.

Method used

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  • Electrodialysis miscellaneous salt resource recycling device
  • Electrodialysis miscellaneous salt resource recycling device
  • Electrodialysis miscellaneous salt resource recycling device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 adopts electrodialysis miscellaneous salt recycling device, such as figure 1 As shown, connect the acid tank to the acid pump, the alkali tank to the alkali pump, the salt pump to the salt tank, and the electrolyte pump to the electrolyte tank to control the acid tank, alkali tank, salt tank, and electrolyte tank. Before starting the experiment, first Circulate for 30 minutes to ensure that the air bubbles in each reaction tank are discharged.

[0048] The treatment object is the simulated miscellaneous salt of industrial crystalline salt effluent, and simulates the treatment effect of different proportions of sodium chloride and sodium sulfate. The ratio of sodium chloride and sodium sulfate is selected as 1:1, 3:1.19:1, and the molar concentration of sodium sulfate is constant at 0.02 mol / L (pH7.0, electrode solution is 3% Na 2 SO 4 ) simulated waste water with a volume of 500mL, of which the acid and alkali tanks contain 0.01mol / L HCl and NaOH with a v...

Embodiment 2

[0059] Embodiment 2 adopts electrodialysis miscellaneous salt recycling device, such as figure 1 As shown, the acid tank is connected to the acid pump, the alkali tank is connected to the alkali pump, the salt pump is connected to the salt tank, and the electrolyte pump is connected to the electrolyte tank to control the acid tank, alkali tank, salt tank, and electrolyte tank. For 30 minutes, ensure that the air bubbles in each chamber of the reaction tank are expelled.

[0060] The object of treatment is the crystalline miscellaneous salt produced in the coal chemical industry process. Dissolve the crystalline miscellaneous salt in a 500mL beaker at a room temperature of 25 degrees Celsius, and stir it at a speed of 400rpm by magnetic force to dissolve it completely.

[0061] After the online conductivity value of the system is stable and no air bubbles are discharged, an external DC power supply box can be connected and adjusted to the constant current mode, and the current ...

Embodiment 3

[0068] Embodiment 3 adopts electrodialysis miscellaneous salt recycling device, such as figure 1 As shown, the acid tank is connected to the acid pump, the alkali tank is connected to the alkali pump, the salt pump is connected to the salt tank, and the electrolyte pump is connected to the electrolyte tank. Before the experiment, first circulate for 30 minutes to ensure that the air bubbles in each reaction tank are discharged.

[0069] The treatment object is RO reverse osmosis concentrated water, and the mixed salt concentration of the concentrated water produced by reverse osmosis is about 70-100g / L. First dilute the concentrated water, the dilution factor is about 2 to 3 times, and then obtain 25 to 30g / L diluted mixed brine.

[0070] After the online conductivity value of the system is stable and no air bubbles are discharged, an external DC power supply box can be connected and adjusted to the constant current mode, and the current density is 5.0mA / cm 2 , to start the ...

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Abstract

The invention discloses an electrodialysis miscellaneous salt resource recycling device. Under the effect of electric field force, negatively charged salt ions are driven to penetrate a PS-g-PE anionic membrane, and positively charged salt ions penetrate through a cation exchange membrane; when anions contained in the miscellaneous salt permeate through a polypyrrole modification layer on the anionic membrane, negatively charged anions are repelled by negatively charged polypyrrole, and the electric repulsive force of polyvalent anions is far higher than that of monovalent anions, so that themonovalent anions selectively permeate and polyvalent salt ions are intercepted, namely, selective separation of monovalent from multivalent salt ion is achieved. Monovalent salt ions penetrating through the anion exchange membrane are combined with hydrogen ions generated by the bipolar membrane to form pure acid; and salt ions penetrating through the cation exchange membrane are combined with hydroxide radicals generated by the bipolar membrane to form sodium carbonate. Therefore, monovalent salt is separated from multivalent hydrochloric acid in the carnallite, pure acid and sodium carbonate are synchronously produced, and the prepared pure acid and alkali can be recycled.

Description

technical field [0001] The invention relates to the field of electrodialysis, in particular to an electrodialysis miscellaneous salt recycling device. Background technique [0002] Bipolar membrane electrodialysis is a new type of electrodialysis technology, which can produce corresponding acid and base from salt solution. The bipolar membrane made of anion and cation exchange membranes with different properties, with the help of the auxiliary intermediate layer catalyst, the water dissociation voltage between the membranes is only 0.82V, which is far lower than the water splitting voltage of ordinary electrodialysis (1.23V ). Therefore, compared with ordinary electrodialysis technology, bipolar membrane electrodialysis technology has a greater advantage in power consumption. Similar to electrodialysis technology, due to the different charges of anions and cations, the ions in the salt solution have different force directions in the bipolar membrane electrodialysis electri...

Claims

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Application Information

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IPC IPC(8): C02F1/469C01D1/04C01B17/74C01B7/01
CPCC02F1/4693C02F1/4698C01B7/01C01B17/74C01D1/04
Inventor 贾金平应迪文仲莉杰张润秋
Owner SHANGHAI JIAO TONG UNIV
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