Method for exchanging and concentrating ions in solution

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

Inactive Publication Date: 2017-01-04
秦才东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

[0038] 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:

[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. Redu...

Embodiment 2

[0049]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, there...

Embodiment 3

[0051] This embodiment provides a new method for treating pure alkali-containing wastewater. Taking pulp and paper mill wastewater as an example, other alkaline wastewater such as textile, leather, and hydrometallurgical wastewater can be similarly operated. The seawater simulated in Embodiment 1 is replaced with alkaline pulping and paper mill sewage. Optimally, ammonium bicarbonate and ammonium carbonate are used as the replacement solution to provide ammonium ions. Only through the above step 1, under normal temperature and pressure, It is calculated by experiments that the cationic membrane per square meter can displace about 50 g of sodium hydroxide from waste water containing about 5% (weight) of alkali per hour. In actual use, the alkali-containing wastewater is recovered by diffusion dialysis in advance, and then the ammonium ion and sodium ion are replaced; and the valuable sodium carbonate obtained in the replacement solution can be mixed with lime water The caustic ...

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Abstract

The invention relates to a method for exchanging and concentrating ions in a solution. The method provides an ion transfer channel through combination of an anionic membrane and a cationic membrane or combined application of anionic resin and cationic resin and achieves substance separation and ion exchange reaction in the solution. Under the effects of different replacement solution, sea water desalination, wastewater recycling and innocent treatment are achieved. The method can be widely applied to sewage treatment, ion concentration, deacidification, dealkalization, desalination and saline water desalting in the industrial production process, production of potassium salt, sodium salt and alkali and mutual conversion among acid, alkali and salt.

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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IPC IPC(8): C02F1/44C02F1/42
CPCY02A20/131
Inventor 秦才东
Owner 秦才东
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