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Cleaning agent composition and cleaning method for reverse osmosis membrane

A technology of composition and cleaning agent, applied in the direction of chemical instruments and methods, semipermeable membrane separation, membrane technology, etc., can solve problems such as cleaning schemes not mentioned, achieve reduced electrical conductivity, reduced pressure difference before and after, and strong iron removal effect of ability

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

[0048] This example is used to illustrate the cleaning method of the cleaning agent composition and the reverse osmosis membrane of the present invention.

[0049] Weigh 2 kg of citric acid / hydrochloric acid mixed solution, in which the weight ratio of citric acid and hydrochloric acid is 1:1, weigh 1 kg of trisodium nitrilotriacetic acid, and weigh 2-phosphonic acid-1,2,4-tricarboxylic acid butyl Alkane (purchased from Shandong Taihe Water Treatment Co., Ltd., density 1.272g / cm 3 (20℃)) 6g, acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methyl propyl sulfonic acid copolymer (purchased from Shandong Taihe Water Treatment Co., Ltd., brand TH-613) 4g, add 70kg Stir the ionized water to fully dissolve it, add deionized water until the weight of the solution is 100 kg, and adjust the pH to 3.0 with ammonia water to obtain a cleaning solution L1.

[0050] according to figure 1 In the process shown, a two-stage two-stage reverse osmosis system is used to treat the raw water with wat...

Embodiment 2

[0064] This example is used to illustrate the cleaning method of the cleaning agent composition and the reverse osmosis membrane of the present invention.

[0065] Weigh 4.5 kg of citric acid / hydrochloric acid mixed solution, in which the weight ratio of citric acid and hydrochloric acid is 0.8:1, weigh 2.5 kg of trisodium nitrilotriacetic acid, and weigh 2-phosphonic acid-1,2,4-tricarboxylate Butane acid (purchased from Shandong Taihe Water Treatment Co., Ltd., density 1.272g / cm 3 (20℃)) 12g, acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methyl propyl sulfonic acid copolymer (purchased from Shandong Taihe Water Treatment Co., Ltd., brand TH-613) 7g, add 70kg Stir the ionized water to fully dissolve it, add deionized water until the weight of the solution is 100 kg, and adjust the pH to 3.1 with NaOH to obtain a cleaning solution L2.

[0066] The reverse osmosis membrane in the two-stage two-stage reverse osmosis system was cleaned according to the method of Example 1, except ...

Embodiment 3

[0068] This example is used to illustrate the cleaning method of the cleaning agent composition and the reverse osmosis membrane of the present invention.

[0069] Weigh 2.3 kg of citric acid / hydrochloric acid mixed solution, in which the weight ratio of citric acid and hydrochloric acid is 0.6:1, weigh 1.4 kg of trisodium nitrilotriacetic acid, and weigh 2-phosphonate-1,2,4-tricarboxylate Butane acid (purchased from Shandong Taihe Water Treatment Co., Ltd., density 1.272g / cm 3 (20℃)) 8g, acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methylpropyl sulfonic acid copolymer (purchased from Shandong Taihe Water Treatment Co., Ltd., brand TH-613) 6g, add 70kg to remove Stir the ionized water to fully dissolve it, add deionized water until the weight of the solution is 100 kg, and adjust the pH to 3.1 with NaOH to obtain a cleaning solution L3.

[0070] The reverse osmosis membrane in the two-stage two-stage reverse osmosis system is cleaned according to the method of Example 1, exce...

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Abstract

The invention relates to a cleaning agent composition, comprising citric acid, hydrochloric acid, trisodium nitrilotriacetate and a dispersing agent. The dispersing agent is selected at least one from an organic phosphonic acid, a poly-aspartic acid, a polyepoxysuccinic acid and a co-polymer and / or a homopolymer obtained by polymerization of at least one of an unsaturated organic acid, an unsaturated organic acid ester and an unsaturated organic acid anhydride, wherein the organic phosphonic acid comprises one or more of hydroxyls, amino groups, carboxyls and sulfonyls. The invention also relates to a method for cleaning a reverse osmosis membrane by using the above cleaning agent composition. The method comprises the steps of preparing the cleaning agent composition into a cleaning liquid with a pH value of 2.5-3.5 and cleaning the reverse osmosis membrane by using the cleaning liquid. The 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 using the cleaning agent composition. Background technique [0002] With global water pollution and water scarcity, water treatment equipment-reverse osmosis desalination unit (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 equipment in the late 1970s, but it was not until the emergence of a new TFC-HR high desalination membrane in 1993 that it achieved greater development. Reverse osmosis is a membrane separation technology that uses the function of selective permeability membranes and is driven by pressure difference. When the pressure applied by the system is greater than the osmotic pressure of the solution, water molecules permeate the membrane and enter the central tube through the water production channel. Flow out at one ...

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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