Electric deionisation method and apparatus for producing superpure water using bipolar membrane

A technology of electrodeionization and bipolar membranes, applied in separation methods, ion exchange water/sewage treatment, general water supply saving, etc., can solve the problem that the silicon removal rate is difficult to reach 99.9%, and the removal efficiency of weakly acidic anion impurities is not high , equipment investment increase and other issues

Inactive Publication Date: 2006-05-10
张贵清
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AI Technical Summary

Problems solved by technology

[0004] Although this conventional mixed-bed electrodeionization can produce ultrapure water with high resistivity (>16Mohm cm), it is difficult to remove the weakly acidic anion impurities, especially Si and B, in the production of ultrapure water. The efficiency is not high. For example, the silicon removal rate of conventional mixed bed electrodeionization technology is difficult to reach more than 99.9%.
In addition, in the conventional mixed-bed electrodeionization technology, the membrane stack can only use a thinner desalination chamber (generally ≤3mm), otherwise the current efficiency and impurity removal effect of the process will be greatly reduced, but the thin desalination chamber design will inevitably Lead to an increase in the area of ​​the membrane used, thereby increasing equipment investment

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  • Electric deionisation method and apparatus for producing superpure water using bipolar membrane
  • Electric deionisation method and apparatus for producing superpure water using bipolar membrane
  • Electric deionisation method and apparatus for producing superpure water using bipolar membrane

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Embodiment approach

[0017] The present invention has various embodiments, and the implementation of the present invention will be described below with reference to the accompanying drawings.

[0018] figure 2 It is a schematic diagram of the equipment structure composition and solution flow circuit for preparing ultrapure water by bipolar membrane electrodeionization, showing an embodiment of the method and equipment for preparing ultrapure water by bipolar membrane electrodeionization according to the present invention. Such as figure 2 As shown, the bipolar membrane electrodeionization equipment includes an anode chamber 18 with an anode 10; a cathode chamber 19 with a cathode 11; and several 3-chamber units: the 3-chamber units are composed of concentrated chamber 15, the second desalination chamber 17 and the first desalination chamber 16; there is an anion exchange membrane 12 between the concentration chamber 15 and the second desalination chamber 17 or the anode chamber 18, and between ...

Embodiment 1

[0023] The equipment and solution flow lines for producing ultrapure water by bipolar membrane electrodeionization are as follows: figure 2 As shown, the electrodeionization apparatus has 3 replicate 3-chamber units. Anion and cation exchange membranes and bipolar membranes are AHA anion exchange membranes, CMB cation exchange membranes and BP-1 bipolar membranes provided by Japan Tokuyama Soda Co., Ltd. respectively. Anion and cation exchangers are DOW 650C UPW cation exchange resin and DOW 550A UPW anion exchange resin respectively. The anode is a titanium platinum-plated mesh electrode, and the cathode is a titanium mesh electrode.

[0024] The effective area of ​​each film is 300cm 2 ; The thickness of each compartment is 10mm, that is, the distance between the adjacent membrane and the membrane is 10mm; Fill each desalting chamber and concentrating chamber with about 300mL of corresponding ion exchange resin, of which about 150mL for cation exchange resin It is hydrog...

Embodiment 2

[0030] The bipolar membrane electrodeionization equipment of embodiment 2 is the same as the bipolar membrane electrodeionization equipment of embodiment 1, and the solution flow line is also the same as embodiment 1 except that the source of the water in the concentration chamber is different. In addition, the embodiment 2 Electrode water is also the same as in Example 1. The difference between embodiment 2 and embodiment 1 is: 1. the source of the water inlet of the concentration chamber is different, in embodiment 1, the water inlet of the concentration chamber is a part of ultrapure water, and in embodiment 2, the water inlet of the concentration chamber It is raw water; 2. the raw water is different, the conductivity of the raw water in Example 1 is 2.3 ± 0.1 μS / cm, contains about 100 ppb of silicon, and contains 10 ppb of boron, while the conductivity of the raw water in Example 2 is 25 ± 2 μS / cm, containing silicon About 150ppb, containing boron 20ppb. The operation pr...

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Abstract

The invention discloses a method for preparation of ultrapure water with bipolar-film electrodeionzation and the device. The device contains an anode chamber with anode, a cathode chamber with catelectrode, and several three-chamber units sequentially from anode to catelectrode comprising of a condensation chamber filled with anion exchanger, the second desalination chamber and the first desalination chamber with cation exchanger; between the chambers are sequentially equipped with cation exchange film, bipolar film, and anion exchange film. The method contains: energizing the catelectrode and anode with direct current, the electrode water flowing sequentially from the anode chamber to the cathode chamber; raw water flowing sequentially through the first desalination chamber and the second desalination chamber, electrodeionzation to produce ultrapure water; and the liquid inlet to condensation chamber being water solution of low conductivity, the solution between condensation chamber to second desalination chamber reflowing. The merit of the invention is characterized in that, compared with the prior art that ultrapure water is prepared by electrodeionzation in mixed bed, weakly-acidic anion impurity silicon, boron, CO2 and so on in water can be removed effectively, and the area of ion exchange film can be distinctively decreased and thus the investment is saved.

Description

technical field [0001] The invention relates to a method and equipment for preparing ultrapure water by using electrodeionization, in particular to a method and equipment for preparing ultrapure water by bipolar membrane electrodeionization. Background technique [0002] Ultrapure water has a wide range of uses. At present, ultrapure water is widely used in semiconductor, electronics, pharmaceutical, power generation, food, chemical and other industries and laboratories. Traditional ultrapure water production adopts mixed bed ion exchange technology. In this process, strong acid and strong alkali are required to periodically regenerate the invalid ion exchange resin. On the one hand, the production process is discontinuous and the water quality is unstable. On the other hand, it causes This process consumes a large amount of acid and alkali reagents, and also pollutes the environment. The new-generation production method of ultrapure water is Electrodeionization (EDI) techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42C02F1/469
CPCY02A20/124
Inventor 张贵清
Owner 张贵清
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