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Cleaning agent composition and cleaning method for reverse osmosis membrane

A technology of composition and cleaning agent, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problem of not mentioning cleaning plan, etc., to reduce electrical conductivity, reduce pressure difference between front and rear, and restore water production Effect

Active Publication Date: 2013-06-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US5499197 discloses an automatic control scheme for a reverse osmosis system. This reverse osmosis system is used to produce drinking water. Various indicators of the produced water are monitored through the automatic control system. The alarm indicates that the RO system needs to be cleaned and can stop the RO system itself if it is not cleaned effectively, but does not mention the specific cleaning method

Method used

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  • Cleaning agent composition and cleaning method for reverse osmosis membrane
  • Cleaning agent composition and cleaning method for reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This example is used to illustrate the cleaning composition of the present invention and the cleaning method of the reverse osmosis membrane.

[0057] Weigh 1 kg of trisodium nitrilotriacetate, 2 kg of citric acid / hydrochloric acid mixed acid, wherein the weight ratio of citric acid and hydrochloric acid is 1:1, add 70 kg of deionized water, stir to fully dissolve, add deionized water to the solution weight 100kg, and adjust the pH value to 3.0 with NaOH to obtain cleaning solution L1-1.

[0058] Weigh 1 kg of sodium dodecylbenzenesulfonate (purchased from Nanjing Suru Chemical Co., Ltd.), acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methylpropylsulfonic acid copolymer (purchased from Taihe, Shandong Province) Water Treatment Co., Ltd., brand TH-613) 3.5g, add 70kg of deionized water, stir to make it fully dissolved, add deionized water until the solution weight is 100kg, and adjust the pH value to 11.0 with NaOH to obtain cleaning solution L2-1 .

[0059] accor...

Embodiment 2

[0079] Take by weighing 2.8kg of trisodium nitrilotriacetate, 4.8kg of citric acid / hydrochloric acid mixed acid, wherein the weight ratio of citric acid and hydrochloric acid is 1.1:1, add 70kg of deionized water, stir to make it fully dissolve, add deionized water to The weight of the solution is 100kg, and the pH value is adjusted to 3.1 with KOH to obtain the cleaning solution L1-2.

[0080] Weigh 2.8kg of sodium dodecylbenzenesulfonate (purchased from Nanjing Suru Chemical Co., Ltd.), acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methylpropylsulfonic acid copolymer (purchased from Shandong Province Taihe Water Treatment Co., Ltd., brand TH-613) 5.9g, add 70kg deionized water, stir to make it fully dissolved, add deionized water until the solution weight is 100kg, and adjust the pH value to 11.1 with KOH to obtain the cleaning solution L2- 2.

[0081] According to the method of Example 1, the reverse osmosis membrane in the two-stage two-stage reverse osmosis system i...

Embodiment 3

[0087] Weigh 1.4kg of trisodium nitrilotriacetate, 2.4kg of citric acid / hydrochloric acid mixed acid, wherein the weight ratio of citric acid and hydrochloric acid is 0.9:1, add 70kg of deionized water, stir to make it fully dissolve, add deionized water to The weight of the solution is 100kg, and the pH value is adjusted to 3.2 with NaOH to obtain the cleaning solution L1-3.

[0088] Weigh 1.4kg of sodium dodecylbenzenesulfonate (purchased from Nanjing Suru Chemical Co., Ltd.), acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methylpropylsulfonic acid copolymer (purchased from Shandong Province Taihe Water Treatment Co., Ltd., brand TH-613) 3.9g, add 70kg deionized water, stir to make it fully dissolved, add deionized water until the solution weighs 100kg, and adjust the pH value to 11.2 with NaOH to obtain the cleaning solution L2- 3.

[0089] According to the method of Example 1, the reverse osmosis membrane in the two-stage two-stage reverse osmosis system is cleaned, t...

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Abstract

The invention relates to a cleaning agent composition, comprising an A agent and a B agent. The A agent and the B agent are stored independently. The A agent comprises citric acid, hydrochloric acid and trisodium nitrilotriacetate; and the B agent contains an anionic surfactant and a dispersing agent, wherein the anionic surfactant is C8-C16 alkylbenzene sulfonate; and the dispersing agent is a (methyl)acrylic homopolymer and / or a (methyl)acrylic acid copolymer. The invention also relates to a method for cleaning a reverse osmosis membrane by using the above cleaning agent composition. A cleaning liquid prepared by the cleaning agent composition can clean the reverse osmosis membrane effectively, makes water yield of a reverse osmosis system restore basically, and can significantly reduce front-and-back pressure difference of the reverse osmosis membrane and reduce conductivity of produced water.

Description

technical field [0001] The invention relates to a cleaning agent composition and a method for cleaning a reverse osmosis membrane by using the cleaning agent composition. Background technique [0002] With global water pollution and water scarcity, water treatment equipment - reverse osmosis desalination device (RO) has developed rapidly since the first high-performance membrane was made in the United States in the late 1950s. my country first adopted reverse osmosis desalination devices in the late 1970s, but it was not until 1993 that TFC-HR high desalination new membranes appeared that great development was achieved. Reverse osmosis is a membrane separation technology driven by pressure difference with the help of the function of selective permeable membrane. When the pressure applied to the system is greater than the osmotic pressure of the solution, water molecules pass through the membrane and enter the central tube through the water flow channel. Flow out at one end....

Claims

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Application Information

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IPC IPC(8): B01D65/06
Inventor 王亭尚荣欣齐海英郦和生
Owner CHINA PETROLEUM & CHEM CORP
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