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 problems such as cleaning schemes not mentioned, achieve good biodegradation performance, reduce electrical conductivity, and good washing and removal The effect of detergency

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

[0044] This example is used to illustrate the cleaning composition of the present invention and the cleaning method of the reverse osmosis membrane.

[0045] Weigh 1 kg of dodecyl alcohol polyoxyethylene ether (purchased from Jiangsu Haian Petrochemical Company, brand E-1206), acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methylpropylsulfonic acid copolymer (purchased from Taihe Water Treatment Co., Ltd., Shandong Province, brand TH-613) 3.5g, add 70kg deionized water, stir to make it fully dissolved, add deionized water to a solution weight of 100kg, and adjust the pH value with NaOH to be 11.0, A cleaning solution L1 is obtained.

[0046] according to figure 1 In the process shown, a two-stage two-stage reverse osmosis system is used to treat the raw water whose water quality parameters are shown in Table 1. The water treatment capacity is 200L / h until the pressure difference between the front and back of the first-stage reverse osmosis membrane increases by 20% or pur...

Embodiment 2

[0060] This example is used to illustrate the cleaning composition and the cleaning method of the reverse osmosis membrane of the present invention.

[0061] Weigh 2.7 kg of dodecyl alcohol polyoxyethylene ether (purchased from Jiangsu Haian Petrochemical Factory Company, brand E-1206), acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methylpropylsulfonic acid copolymerization (purchased from Shandong Taihe Water Treatment Co., Ltd., brand TH-613) 5.5g, 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 11.2 with KOH , to obtain cleaning solution L2.

[0062] The reverse osmosis membrane in the two-stage two-stage reverse osmosis system was cleaned according to the method of Example 1, except that the cleaning solution L1 used in Example 1 was replaced with cleaning solution L2.

Embodiment 3

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

[0065] Weigh 1.3 kg of dodecyl alcohol polyoxyethylene ether (purchased from Jiangsu Haian Petrochemical Company, brand E-1206), acrylic acid / hydroxypropyl acrylate / 2-acrylamide-2-methylpropylsulfonic acid copolymerization (purchased from Taihe Water Treatment Co., Ltd., Shandong Province, brand TH-613) 3.9g, 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 11.4 with NaOH , to obtain cleaning solution L3.

[0066] The reverse osmosis membrane in the two-stage two-stage reverse osmosis system was cleaned according to the method of Example 1, except that the cleaning solution L1 used in Example 1 was replaced with cleaning solution L3.

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Abstract

The invention relates to a cleaning agent composition, comprising a non-ionic surfactant and a dispersing agent, wherein the non-ionic surfactant is a fatty alcohol-polyoxyethylene ether; 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. The method comprises the steps of preparing the cleaning agent composition into a cleaning liquid with a pH value of 10.5-11.5 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 Applications(China)
IPC IPC(8): B01D65/06
Inventor 王亭齐海英尚荣欣郦和生
Owner CHINA PETROLEUM & CHEM CORP
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