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Industrial ultrapure water preparation process

A preparation process, ultra-pure water technology, applied in the direction of general water supply saving, degassed water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of low removal rate, no removal of bicarbonate, and can not meet the requirements of industrial applications and other issues to achieve the effect of low investment

Inactive Publication Date: 2009-09-09
ZHEJIANG OMEX ENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process also has many deficiencies: From the perspective of degassing, there are both bicarbonate and carbon dioxide in the first-stage reverse osmosis product water, and degassing can only remove part of the carbon dioxide, the removal rate is low, and the carbonic acid Hydrogen radicals have no removal effect; from the perspective of water quality, the water resistivity of this process is usually lower than 1MΩ·cm, while the high-pressure boiler requires ≥5.0MΩ·cm, and the ultra-pure water in the electronics industry requires ≥15.0MΩ·cm. Cannot meet industrial application requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: After the raw water is pretreated by the pretreatment facility 1, it is pressurized by the high-pressure pump 2 and supplied to the reverse osmosis membrane group 4 through the pipeline to remove dissolved salts in the water, and at the same time remove some macromolecules and small particles that were not removed in the previous stage Wait. Its function is to pre-demineralize the pre-treated produced water. The hydrochloric acid dosing system 8 adds hydrochloric acid to the pretreated water that has been desalted by the reverse osmosis membrane, so that the pH value of the pretreated water is 6. The purpose of adding hydrochloric acid is to convert bicarbonate and carbonate into carbonic acid by adding acid , the pretreated water passes through the degassing device 5 to remove carbon dioxide. After passing through the degassing device 5, most of the carbon dioxide gas in the water is removed, and the remaining carbon dioxide gas dissolved in water, that is,...

Embodiment 2

[0043] Example 2: After the raw water is pretreated by the pretreatment facility 1, it is pressurized by the high-pressure pump 2 and supplied to the reverse osmosis membrane group 4 through the pipeline to remove dissolved salts in the water, and at the same time remove some macromolecules and small particles that were not removed in the previous stage Wait. Its function is to pre-demineralize the pre-treated produced water. The hydrochloric acid dosing system 8 adds hydrochloric acid to the pretreated water that has been pre-desalted by the reverse osmosis membrane, so that the pH value of the pretreated water is 5. The purpose of adding hydrochloric acid is to convert bicarbonate and carbonate into carbonic acid by adding acid , the pretreated water passes through the degassing device 5 to remove carbon dioxide. After passing through the degassing device 5, most of the carbon dioxide gas in the water is removed, and the remaining carbon dioxide gas dissolved in water, that...

Embodiment 3

[0044] Example 3: After the raw water is pretreated by the pretreatment facility 1, it is pressurized by the high-pressure pump 2 and supplied to the reverse osmosis membrane group 4 through the pipeline to remove dissolved salts in the water, and at the same time remove some macromolecules and small particles that were not removed in the previous stage Wait. Its function is to pre-demineralize the pre-treated produced water. The hydrochloric acid dosing system 8 adds hydrochloric acid to the pretreated water that has been pre-desalted by the reverse osmosis membrane, so that the pH value of the pretreated water is 4. The purpose of adding hydrochloric acid is to convert bicarbonate and carbonate into carbonic acid by adding acid , the pretreated water passes through the degassing device 5 to remove carbon dioxide. After passing through the degassing device 5, most of the carbon dioxide gas in the water is removed, and the remaining carbon dioxide gas dissolved in water, that...

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Abstract

The invention discloses a technique for preparation of industrial ultrapure water, which contains: first-rate hyperfiltration of the pretreated water, through the degassing device and electric desalinization, after first-rate hyperfiltration of said pretreated water to desalt, adding acid; after decarbonation by degassing device, adding alkali; then flowing into electric desalinization instrument for fine desalinization to prepare industrial ultrapure water. According to the work characteristic of degassing film and electric desalinization instrument (EDI); using the decarbonation technique of adding acid- decarbonation- adding alkali' and strong electrolytes replacing weak electrolytes, it is convenient for deep desalinization by electric desalinization instrument.

Description

technical field [0001] The invention relates to a process for preparing industrial ultrapure water, in particular to a process for producing industrial ultrapure water with an electric desalter after removing carbon dioxide from the first-stage reverse osmosis water. Background technique [0002] Ultrapure water is widely used in electric power, electronics, chemical, pharmaceutical and other industries. Reverse osmosis and Electrodemineralizer (EDI) are among the commonly used processes. Reverse osmosis equipment can remove most of the ions in water, and its desalination rate is generally 98%-99%. The reverse osmosis produced water is desalinated deeply through the electric desalter, and then meets the application requirements of industrial high-purity water. [0003] There are various forms of carbonates in natural water. They are not only an important factor in determining the pH of water quality, but also have a certain buffering effect on external acids or alkalis, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/44C02F1/20C02F1/46
CPCY02A20/131
Inventor 沈霖李辉李艳丽
Owner ZHEJIANG OMEX ENVIRONMENTAL ENG CO LTD
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