Exchange and concentration method and apparatus for ions in solution

A solution and ion technology, applied in ion exchange treatment devices, ion exchange, cation exchange, etc., can solve the problems of reduced driving force, increased resistance, insufficient driving force, etc.

Inactive Publication Date: 2017-03-08
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 and device in the solution of the present invention is: during the existing diffusion dialysis and Donnan diffusion dialysis, as the diffusion proceeds, the driving force constantly decreases, the resistance constantly increases, and the driving force is insufficient The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a new method for seawater desalination, acid-base and salt-containing sewage treatment, or as a primary treatment method for subsequent reverse osmosis, electrodialysis, etc. This method can open up new application fields and can also be applied to Fields where ion exchange resins are already in use.

[0039] 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. Reducing the depth is conducive to the uniform fluidity of the solution. The first and second two membrane chambers are formed on both sides of the membrane, and there are two connection ports on each side of the membrane chamber to connect the conduits of the water...

Embodiment 2

[0049] 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, and Calcium and magnesium ions in the water form precipitates after infiltration and lead to microcracks, resulting in frequent leakage problems during the experiment], urban tap water containing trace electrolytes [200ml, the measured salinity value is 0.1ppt] as the solution to be treated. The corresponding exchange solution is subjected to diffusion dialysis; the thickness of the strongly acidic cation membrane used is about 0.28 mm.

[0050] When the driving solution is a saturated ammonium chloride solution, after half an hour of diffusion dialysis, it is measured that there is ammonia gas in the ammonium chloride solution and tap water, which makes...

Embodiment 3

[0055] Soak 50g of commercially available strong-acid sodium-type cationic resin with saturated ammonium chloride solution for 6 hours, that is, the regeneration process, and soak 50g of strong-basic chloride-type anion resin with saturated 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 exchange reaction, pour seawater into the previously treated anion resin. After 1 hour of exchange reaction, complete an exchange 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, there is a similar effect, but the exchange rate is slower. Regarding the regeneration of the r...

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Abstract

The invention relates to an exchange and concentration method and apparatus for ions in a solution. According to the invention, separation of substances in the solution and an exchange reaction of ions in the solution are realized by providing a channel for ion transfer via a combination of an anionic membrane and a cationic membrane or a combination of anionic resin and cationic resin. The method realizes seawater desalination and recycling and harmless treatment of wastewater under the action of different driving solutions; and the method is widely applicable to sewage treatment, to ion concentration, deacidification, dealkalization, desalination and saline water desalination in the process of various industrial production, to production of sylvite, sodium salts and alkali, and to mutual conversion between acid and alkali salts.

Description

technical field [0001] The invention relates to a method and device for exchanging and concentrating ions in a solution, in particular to a combined application method utilizing anion membranes and cation membranes, anion resins, and cation resins, 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D15/36B01D61/28B01J47/00C02F1/44C02F1/42C02F1/28C02F103/08
CPCY02A20/131
Inventor 秦才东
Owner 秦才东
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