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Method for exchanging and concentrating ions in solution

A solution and ion technology, applied in ion exchange water/sewage treatment, general water supply saving, osmosis/dialysis water/sewage treatment, etc., can solve the problems of insufficient driving force, no additional driving force, increased resistance, etc.

Inactive Publication Date: 2017-01-11
秦才东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the ion exchange and concentration method in the solution of the present invention is: there is no additional driving force in the existing diffusion dialysis and Donnan diffusion dialysis, and as the diffusion proceeds, the driving force decreases continuously and the resistance increases continuously , there is a problem of insufficient driving force

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a new method for seawater desalination and sewage treatment containing acid, alkali and salt, as an example to demonstrate ion exchange and concentration methods in any solution, which is to use simple diffusion dialysis or Donnan dialysis. This new method combines the advantages of both Donnan diffusion dialysis and ion exchange methods, and also overcomes the problem of low driving force of Donnan dialysis, which can open up new application fields and can also be partially applied to the fields where ion exchange resins are already in use. . It includes:

[0041] Step 1, in the experiment, it is preferable that weakly acidic or neutral cationic membrane is the diffusion dialysis membrane in the Donnan dialysis device, and this membrane is clamped between two nylon parts that the opening diameter is 3 centimeters and butt joint, the membrane The effective area is a 3 cm diameter circle, and the opening depth of each nylon piece is 1.5 cm. Redu...

Embodiment 2

[0052] In order to test the decomposition effect of the ammonium salt, the leakage caused by it, and the leakage parameters of the membrane itself [Experiments found that due to the characteristics of the cationic membrane material, when clamped with nylon parts, it is easy to cause membrane deformation at the contact boundary, or Leakage problems often occur during the experiment], city tap water [200ml, the measured salinity value is 0.1ppt] containing trace electrolytes is used as the solution to be treated, that is, the corresponding exchange solution for diffusion dialysis; the strong acidic cationic membrane used The thickness is about 0.28mm.

[0053] When the driving solution is a saturated ammonium chloride solution, after half an hour of diffusion dialysis, it is measured that ammonia gas is released from the ammonium chloride solution and tap water, and the pH test paper is colored, and the pH value of the tap water increases from about 7 to About 7.5. In addition, it...

Embodiment 3

[0061] This embodiment provides an example of a seawater or wastewater desalination method. Soak 50g of commercially available strongly acidic cationic resin with saturated ammonium chloride solution for 6 hours, i.e. the regeneration process, soak 50g of strongly basic anionic resin with saturated ammonium carbonate or ammonium bicarbonate solution for 6 hours. After the resin is taken out, it is fully washed with water, and the water is removed by centrifugation. First pour 150ml of simulated seawater into the cationic resin treated with ammonium chloride. After 1 hour of displacement reaction, pour seawater into the previously treated anion resin. After 1 hour of displacement reaction, complete a displacement cycle , and then poured into the cationic resin, after 3 cycles, the measured salinity decreased from 35 per thousand to 29 per thousand, accompanied by the precipitation of alkaline ammonia gas. When using weakly acidic cation resin and weakly basic anion resin, ther...

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Abstract

The invention relates to a method for exchanging and concentrating ions in a solution. By adopting the combination of an anionic membrane and a cationic membrane or the combination of a cationic resin and an anionic resin, a channel for ion transfer is provided to realize the separation of substances in the solution and the exchange reaction of ions. Under the action of different replacement solutions, seawater desalination, waste water recycling and harmless treatment are realized; the method can be widely applied to sewage treatment and industrial production processes, ion concentration, deacidification, dealkalization, desalination, brine desalination process in the industry production process, the production of potassium salt, sodium salt and alkali, and the mutual conversion between acid, alkali and salts.

Description

technical field [0001] The invention relates to an ion exchange and concentration method in a solution, in particular to a combined application method utilizing an anion membrane and a cation membrane, an anion resin and a cation resin, and belongs to the technical field of ion separation. Background technique [0002] In water treatment, including seawater desalination, chemical production, chemical separation and chemical reaction, light industry and food, atomic energy and other industrial fields, it often involves the exchange or conversion of various anions and cations in water, or separation and removal or concentration recovery, and organic matter and Separation, dehydration, purification and concentration of different kinds of substances such as water, acid, alkali and salt, and double decomposition reactions. Because of the development of the chemical industry, water pollution and the scarcity of fresh water have affected the sustainable development of the economy, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F1/42
CPCY02A20/131
Inventor 秦才东
Owner 秦才东
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