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Method for electrically regenerating H type cation bed failure cation exchange resin through bipolar membrane method

A cation exchange and bipolar membrane technology, applied in ion exchange, ion exchange regeneration, ion exchange bed cleaning/flushing, etc., can solve the pollution of waste acid and alkali liquid discharge, low utilization rate of acid and alkali, poor working conditions, etc. problem, to achieve the effect of improving the working conditions of workers, convenient regeneration operation, and favorable promotion

Inactive Publication Date: 2019-06-21
SUZHOU HUAQING WATER TREATMENT TECH
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  • 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 H type cation bed failure cation exchange resin through bipolar membrane method
  • Method for electrically regenerating H type cation bed failure cation exchange resin through bipolar membrane method
  • Method for electrically regenerating H type cation bed failure cation 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 method of electrically regenerating the H-type cation bed spent cation exchange resin by bipolar membrane method during downstream regeneration.

[0040] A method for electrically regenerating H-type cation bed invalid cation exchange resin by bipolar membrane method, the method comprises the following steps:

[0041] (1) Preparation of dilute brine: Before regeneration of the H-type positive bed, dilute brine should be prepared. Dilute brine is made 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 acid regeneration solution: when the H-type cation 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 the s...

Embodiment 2

[0050] image 3 It is a schematic diagram of the appearance of the method of electrically regenerating H-type cation bed invalid cation exchange resin during countercurrent regeneration.

[0051] The method of bipolar membrane electrical regeneration of spent cation exchange resin in the H-type cation bed during countercurrent regeneration is roughly the same as that during downstream regeneration.

[0052] Countercurrent regeneration means that the flow direction of the regeneration liquid in the H-type cation-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 H type cation bed failure cation exchange resin through a bipolar membrane method, wherein the method comprises: dilute salt water preparing, dilute acid regeneration liquid preparing, back flushing, regeneration and washing, and the mass percentage concentration of the dilute acid regeneration liquid used in the regeneration of the H type cation bed failure cation exchange resin is less than or equal to 8%. According to the present invention, the process for preparing the acid liquid for the H type cation bed failure cation 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, andcan replace the traditional process for chemically regenerating the H type cation bed failure cation exchange resin by purchasing the acid liquid, such that the regeneration level of the H type cationbed failure cation exchange resin is improved, the storage and transportation link of the regenerated acid liquid is eliminated, the regeneration operation of the H type cation bed failure cation 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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IPC IPC(8): B01J49/00B01J49/30B01J49/53B01J49/60
Inventor 王明亚王方王明太
Owner SUZHOU HUAQING WATER TREATMENT TECH
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