Method for electrically regenerating OH type anion bed failure anion exchange resin through bipolar membrane method

An exchange resin, bipolar membrane electrodialysis technology, applied in ion exchange, ion exchange regeneration, ion exchange bed cleaning/flushing, etc., can solve the problem of waste acid and alkali discharge polluting the environment, low acid and alkali utilization rate, and complex regeneration operation. and other problems, to achieve the effect of improving the working conditions of workers, convenient regeneration operation, and simplified operation.

Inactive Publication Date: 2019-06-21
SUZHOU HUAQING WATER TREATMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many defects in the acid-base chemical regeneration method of invalid ion exchange resins, such as low utilization rate of acid-base for regeneration, waste acid-base liquid discharge pollutes the environment, complex regeneration operation, acid-base is regarded as a dangerous chemical, and attention should be paid to safe storage and transportation. The working conditions are also bad, therefore, there is an urgent need to develop a new method for the regeneration of ion exchange resins

Method used

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  • Method for electrically regenerating OH type anion bed failure anion exchange resin through bipolar membrane method
  • Method for electrically regenerating OH type anion bed failure anion exchange resin through bipolar membrane method
  • Method for electrically regenerating OH type anion bed failure anion exchange resin through bipolar membrane method

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Embodiment 1

[0039] figure 1 It is a schematic diagram of the appearance of the bipolar membrane method for electrically regenerating the OH-type anion bed spent anion exchange resin during downstream regeneration.

[0040] A method for electrically regenerating OH-type anion bed invalidation anion exchange resin by bipolar membrane method, the method comprises the following steps:

[0041] (1) Preparation of dilute brine: Before regeneration of the OH-type negative bed, dilute brine should be prepared. Dilute brine is prepared by adding salt to pure water. The salt concentration should be adjusted to the set value. brine, stored in dilute brine tanks;

[0042] (2) Preparation of dilute alkali regeneration solution: when the OH-type negative bed fails and is disassembled, the bipolar membrane electrodialyzer is started, and under the action of a direct current electric field, the bipolar membrane electrodialyzer ionizes water into H + and OH - Ions, they are respectively combined with t...

Embodiment 2

[0050] image 3 It is a schematic diagram of the appearance of the bipolar membrane method for electrically regenerating the OH-type anion bed spent anion exchange resin during countercurrent regeneration. The method of bipolar membrane electrical regeneration of OH-type negative bed anion exchange resin during countercurrent regeneration is roughly the same as that during downstream regeneration.

[0051] Countercurrent regeneration means that the flow direction of the regeneration liquid in the OH-type anion bed ion exchange tank is from bottom to top and the flow direction of the liquid to be treated is opposite from top to bottom during operation, that is, the two fluid directions are countercurrent.

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Abstract

The invention relates to a method for electrically regenerating an OH type anion bed failure anion exchange resin through a bipolar membrane method, wherein the method comprises: dilute salt water preparing, dilute alkali regeneration liquid preparing, back flushing, regeneration and washing, and the mass percentage concentration of the dilute alkali regeneration liquid used in the regeneration ofthe OH type anion bed failure anion exchange resin is less than or equal to 8%. According to the present invention, the new process for preparing the alkali liquid for the OH type anion bed failure anion exchange resin regenerating from the salt water by the bipolar membrane electrodialyzer according to the water dissociation effect under the action of the direct current electric field is provided, and can replace the traditional process for chemically regenerating the OH type anion bed failure anion exchange resin by purchasing the alkali liquid, such that the regeneration level of the OH type anion bed anion resin is improved, the storage and transportation link of the regenerated alkali liquid is eliminated, the regeneration operation of the OH type anion bed failure anion exchange resin is convenient, the safety level is improved, and the environment is friendly.

Description

technical field [0001] The invention relates to a method for regenerating spent ion exchange resins in ion exchange processes. Background technique [0002] Ion exchange technology has been widely used in petrochemical, light industry, food, medicine, metallurgy, atomic energy, electric power and environmental protection, involving all aspects of national economy and people's life. Taking a thermal power plant as an example, the preparation of boiler feed water and condensate polishing requires the use of various advanced physical and chemical treatments and various membrane technologies, as well as the use of ion exchange water treatment technology, which requires the use of various ion exchange equipment. , such as yang bed, yin bed, mixed bed, etc. These ion exchange devices are all filled with ion exchange resins, and the ion exchange resins must be regenerated after the equipment runs to treat water and becomes invalid, so that the invalid ion exchange resins can recov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J49/30B01J49/57B01J49/60
Inventor 王明亚王方王明太
Owner SUZHOU HUAQING WATER TREATMENT TECH
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