Reverse osmosis membrane on-line chemical cleaning method and cleaning agent

A reverse osmosis membrane and chemical cleaning technology, which is applied to chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of undisclosed formulas and expensive prices, and achieve simple and easy control of parameters, low prices, and obvious cleaning effects Effect

Inactive Publication Date: 2009-06-17
SEMICON MFG INT (SHANGHAI) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The cleaning method is a conventional method for cleaning the reverse osmosis membrane in the prior art, but in the process, the cleaning agent used is usually a special cleaning agent provided by the manufacturer of the reverse osmosis membrane or a membrane cleaning company, The recipe is not public and the price is expensive

Method used

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  • Reverse osmosis membrane on-line chemical cleaning method and cleaning agent
  • Reverse osmosis membrane on-line chemical cleaning method and cleaning agent
  • Reverse osmosis membrane on-line chemical cleaning method and cleaning agent

Examples

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Embodiment 1

[0038] The present embodiment provides an alkaline reverse osmosis membrane cleaning agent, comprising:

[0039] A solution of tetrasodium ethylenediaminetetraacetic acid (EDTA-4Na) or sodium dodecylbenzenesulfonate or sodium tripolyphosphate with a concentration of 1-4%, and a pH of 10-12.

[0040] Wherein, the reagent for adjusting the pH value of the alkaline reverse osmosis membrane cleaning agent between 10 and 12 is sodium hydroxide or potassium hydroxide.

[0041] Wherein, the optimal concentration of tetrasodium edetate, sodium dodecylbenzenesulfonate or sodium tripolyphosphate in the alkaline reverse osmosis membrane cleaning agent is 2-3%.

[0042] Wherein, the optimal pH range of the alkaline reverse osmosis membrane cleaning agent is 11-12.

[0043] The preparation method of the alkaline reverse osmosis membrane cleaning agent is a conventional method, and the present embodiment provides a kind of implementation mode, at first preparation concentration is at 1%~4%...

Embodiment 2

[0051] Attached below figure 1 , 2 3. Describe the specific method for online cleaning of the reverse osmosis membrane using the alkaline reverse osmosis membrane cleaning agent described in this embodiment.

[0052] The method of using the alkaline reverse osmosis membrane cleaning agent described in this embodiment to carry out on-line chemical cleaning of the reverse osmosis membrane is: alternately use the acidic reverse osmosis membrane cleaning agent and the alkaline reverse osmosis membrane cleaning agent to clean the reverse osmosis membrane.

[0053] Described acidic reverse osmosis membrane cleaning agent comprises: concentration is 1~4% citric acid monohydrate (C 6 h 8 o 7 ·H 2 O) or oxalic acid or phosphoric acid solution, the pH of the solution is 1-4.

[0054] The preparation method of the acidic reverse osmosis membrane cleaning agent is a conventional method, and this embodiment provides an implementation mode, first preparing a monohydrate citric acid or ...

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Abstract

The invention provides an alkali reverse osmosis membrane cleaning agent, which comprises an ethylene diamine tetraacetic acid tetrasodium salt solution or a sodium dodecyl benzene sulfonate solution or a trimeric sodium phosphate solution, of which the concentration is between 1 and 4 percent and the pH value is between 10 and 12. The cleaning agent adopts common chemicals, so that the cleaning agent has low price and simple formula, and materials of the cleaning agent are available. The invention also provides a method for on-line chemical cleaning of the reverse osmosis membrane, by alternately using an acid reverse osmosis membrane cleaning agent and the alkali reverse osmosis membrane cleaning agent for on-line cleaning of the reverse osmosis membrane, the reverse osmosis membrane can be easily and effectively cleaned, and the cleaning effect is quite obvious; moreover, the technical process can also is easy to control.

Description

technical field [0001] The invention relates to the technical field of semiconductor manufacturing, in particular to an on-line chemical cleaning method for a reverse osmosis membrane and a cleaning agent for the reverse osmosis membrane. Background technique [0002] Reverse osmosis technology is a pressure-driven membrane separation technology developed in the early 1960s. Reverse osmosis technology has the advantages of no phase change, componentization, simple process, convenient operation, small footprint, low investment, and low power consumption, so it has been widely used in water treatment. Its application range covers electric power, electronics, chemical industry, light industry, coal, environmental protection, medicine, food and other industries. The reverse osmosis membrane is the core of the reverse osmosis system, and its performance directly affects the performance of the reverse osmosis system. [0003] When the reverse osmosis system has been in operation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/06
Inventor 张松峰
Owner SEMICON MFG INT (SHANGHAI) CORP
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