Cleaning agent composition and cleaning method for reverse osmosis membrane

A technology of reverse osmosis membrane and composition, applied in the field of cleaning agent composition, can solve the problem of not mentioning cleaning scheme, etc., and achieve the effects of reducing electrical conductivity, reducing pressure difference between front and rear, and strong iron removal ability

Active Publication Date: 2015-07-22
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 composition of the present invention and the cleaning method of the reverse osmosis membrane.

[0049] Take by weighing citric acid / hydrochloric acid mixed solution 2kg, wherein the weight ratio of citric acid and hydrochloric acid is 1: 1, take by weighing trisodium nitrilotriacetate 1kg, take by weighing 2-phosphonic acid group-1,2,4-tricarboxylic acid butyl Alkane (purchased from Shandong Taihe Water Treatment Co., Ltd., density is 1.272g / cm 3 (20°C)) 6g, acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methylpropylsulfonic acid copolymer (purchased from Shandong Taihe Water Treatment Co., Ltd., brand TH-613) 4g, add 70kg to Deionized water, stirred to make it fully dissolved, added deionized water until the weight of the solution was 100kg, and adjusted the pH value to 3.0 with ammonia water to obtain cleaning solution L1.

[0050] according to figure 1 In the process shown, a two-stage two-stage reverse osmosis sy...

Embodiment 2

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

[0065] Take by weighing citric acid / hydrochloric acid mixed solution 4.5kg, wherein the weight ratio of citric acid and hydrochloric acid is 0.8: 1, take by weighing trisodium nitrilotriacetate 2.5kg, take by weighing 2-phosphonic acid group-1,2,4-tricarboxylic Acid butane (purchased from Shandong Taihe Water Treatment Co., Ltd., density is 1.272g / cm 3 (20°C)) 12g, acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methylpropylsulfonic acid copolymer (purchased from Shandong Taihe Water Treatment Co., Ltd., brand TH-613) 7g, add 70kg to Deionized water, stirred to make it fully dissolved, added deionized water until the weight of the solution was 100kg, and adjusted the pH value to 3.1 with NaOH to obtain cleaning solution L2.

[0066] The reverse osmosis membrane in the two-stage two-stage reverse osmosis system was cleaned ac...

Embodiment 3

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

[0069] Take by weighing citric acid / hydrochloric acid mixed solution 2.3kg, wherein the weight ratio of citric acid and hydrochloric acid is 0.6: 1, take by weighing trisodium nitrilotriacetate 1.4kg, take by weighing 2-phosphonic acid group-1,2,4-tricarboxylic Acid butane (purchased from Shandong Taihe Water Treatment Co., Ltd., density is 1.272g / cm 3 (20°C)) 8g, acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methylpropylsulfonic acid copolymer (purchased from Shandong Taihe Water Treatment Co., Ltd., brand TH-613) 6g, add 70kg to Deionized water, stirred to make it fully dissolved, added deionized water until the weight of the solution was 100kg, and adjusted the pH value to 3.1 with NaOH to obtain cleaning solution L3.

[0070] The reverse osmosis membrane in the two-stage two-stage reverse osmosis system was cleaned acc...

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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 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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Patent Type & Authority Patents(China)
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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