A kind of organic cleaning agent for reverse osmosis membrane and preparation method thereof

Abstract

The present invention provides a reverse osmosis membrane organic cleaning agent and a preparation method thereof, wherein the reverse osmosis membrane organic cleaning agent is mainly prepared from the following raw materials: by weight, 20-40 parts of polyethylene glycol, 15-20 parts of polyethylene glycol octylphenyl ether, 5-10 parts of tetrasodium ethylenediaminetetraacetate, 3-8 parts of bactericide, 5-15 parts of citric acid and 20-30 parts of deionized water. The reverse osmosis membrane organic cleaning agent of the present invention efficiently removes pollutants such as inorganic salts, organic matter and microorganisms on the reverse osmosis membrane through a combination of a specific organic solvent, a surfactant, a chelating agent and a bio-inhibitor.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning agents, and in particular to an organic cleaning agent for a reverse osmosis membrane and a preparation method thereof. Background Art

[0002] As an efficient water treatment technology, reverse osmosis technology is widely used in seawater desalination, industrial wastewater treatment, drinking water purification and other fields. However, as the operating time increases, various pollutants will accumulate on the reverse osmosis membrane, resulting in a decrease in membrane performance and the need for regular cleaning. Traditional cleaning agents often have problems such as unsatisfactory cleaning effects, strong corrosion to membrane materials, and great environmental impact. Therefore, it is particularly important to develop an efficient, environmentally friendly, and low-corrosive organic cleaning agent for reverse osmosis membranes.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The first object of the present invention is to provide an organic cleaning agent for reverse osmosis membranes with a simple formula, which can effectively remove pollutants such as inorganic salts, organic matter and microorganisms on the reverse osmosis membranes through a combination of specific organic solvents, surfactants, chelating agents and bio-inhibitors.

[0005] The second object of the present invention is to provide a method for preparing the above-mentioned reverse osmosis membrane organic cleaning agent, which has simple operation, mild operating conditions, no pollution, no discharge of three wastes, and is safe and environmentally friendly.

[0006] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted: The invention provides a multifunctional oil remover for oilfield sewage, which is mainly prepared from the following raw materials: 20-40 parts of polyethylene glycol, 15-20 parts of polyethylene glycol octylphenyl ether, 5-10 parts of tetrasodium ethylenediaminetetraacetate, 3-8 parts of bactericide, 5-15 parts of citric acid and 20-30 parts of deionized water, calculated by weight.

[0007] Preferably, as a further feasible scheme, in parts by mass, there are 25-35 parts of polyethylene glycol, 16-19 parts of polyethylene glycol octylphenyl ether, 6-9 parts of tetrasodium ethylenediaminetetraacetate, 4-7 parts of bactericide, 7-12 parts of citric acid and 22-28 parts of deionized water.

[0008] Preferably, as a further feasible scheme, in parts by mass, there are 30 parts of polyethylene glycol, 18 parts of polyethylene glycol octylphenyl ether, 7 parts of tetrasodium ethylenediaminetetraacetate, 5 parts of bactericide, 10 parts of citric acid and 26 parts of deionized water.

[0009] In the present invention, the organic solvent polyethylene glycol is used to dissolve and disperse pollutants to improve the cleaning efficiency; the surfactant is selected as a non-ionic surfactant polyethylene glycol octyl phenyl ether to enhance the wettability and permeability of the cleaning liquid to the membrane surface, so that the cleaning effect is more thorough; tetrasodium ethylenediaminetetraacetic acid is used as a preferred chelating agent to complex and remove metal ions to prevent the metal ions from damaging the membrane material; and the addition of a bactericide in the formula can effectively inhibit the growth and reproduction of microorganisms to prevent secondary contamination of the membrane.

[0010] In the above formula, it is necessary to pay attention to the dosage relationship between each substance. The dosage of each substance needs to be controlled within a reasonable range, because if the dosage of any component is too large, it will cover up the effect of other components. Although the stability is improved, the cleaning effect will be affected. Therefore, in addition to paying attention to the specific combination between the formulas, you must also pay attention to the compatibility relationship between the dosages.

[0011] The present invention also provides a method for preparing an organic cleaning agent for a reverse osmosis membrane, comprising the following steps: After polyethylene glycol and polyethylene glycol octylphenyl ether are mixed with a portion of deionized water, tetrasodium ethylenediaminetetraacetate and citric acid are added, mixed and stirred, and then a bactericide and the remaining deionized water are added.

[0012] Preferably, as a further feasible solution, the polyethylene glycol, polyethylene glycol octylphenyl ether and a portion of deionized water are mixed and stirred for 20-40 minutes.

[0013] Preferably, as a further feasible solution, the time for adding tetrasodium ethylenediaminetetraacetate and citric acid and mixing and stirring is more than 1 hour.

[0014] Preferably, as a further feasible solution, the fungicide and the remaining deionized water are added and stirring is continued for more than 30 minutes.

[0015] Preferably, as a further feasible solution, the stirring speed during the entire stirring process is controlled between 200-300 rpm.

[0016] By limiting the various operating parameters in the preparation method, the quality of the prepared organic cleaning agent is improved. Through the combination of specific organic solvents, surfactants, chelating agents and bio-inhibitors, pollutants such as inorganic salts, organic matter and microorganisms on the reverse osmosis membrane can be efficiently removed. The chemical components with low corrosion to the membrane material are used to ensure that the membrane material will not be damaged while being effectively cleaned. The chemical components in the cleaning agent are all environmentally friendly raw materials, harmless to the human body and the environment, and easily biodegradable. The cleaning agent is easy to dissolve and disperse, has a wide temperature range, is easy to operate, and improves the cleaning efficiency. DETAILED DESCRIPTION

[0017] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. If specific conditions are not specified in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0018] Example 1 The specific preparation process of the organic cleaning agent for reverse osmosis membrane is carried out according to the following steps: (1) Raw material preparation: 20kg polyethylene glycol, 20kg polyethylene glycol octylphenyl ether, 5kg tetrasodium ethylenediaminetetraacetic acid, 8kg bactericide, 5kg citric acid, 30kg deionized water; (2) Add polyethylene glycol and polyethylene glycol octylphenyl ether into the reaction kettle, add 10 kg of deionized water and stir for 40 minutes until completely mixed; (3) Add tetrasodium ethylenediaminetetraacetate and citric acid to step (2) and continue stirring for 1 hour; (4) Add the bactericide and the remaining deionized water to step (3) and continue stirring for 30 minutes to obtain a highly efficient and environmentally friendly organic cleaning agent for reverse osmosis membranes. The stirring rate is controlled at 250 rpm during the entire stirring process.

[0019] Example 2 The specific preparation process of the organic cleaning agent for reverse osmosis membrane is carried out according to the following steps: (1) Raw material preparation: 40kg polyethylene glycol, 15kg polyethylene glycol octylphenyl ether, 10kg tetrasodium ethylenediaminetetraacetic acid, 3kg bactericide, 15kg citric acid, 20kg deionized water; (2) Add polyethylene glycol and polyethylene glycol octylphenyl ether into the reaction kettle, add 10 kg of deionized water and stir for 20 minutes until completely mixed; (3) Add tetrasodium ethylenediaminetetraacetate and citric acid to step (2) and continue stirring for 2 hours; (4) Add the bactericide and the remaining deionized water to step (3) and continue stirring for 40 minutes to obtain a highly efficient and environmentally friendly organic cleaning agent for reverse osmosis membranes. The stirring rate is controlled at 300 rpm during the entire stirring process.

[0020] Example 3 The specific preparation process of the organic cleaning agent for reverse osmosis membrane is carried out according to the following steps: (1) Raw material preparation: 25kg polyethylene glycol, 19kg polyethylene glycol octylphenyl ether, 6kg tetrasodium ethylenediaminetetraacetic acid, 7kg bactericide, 7kg citric acid, 28kg deionized water; (2) Add polyethylene glycol and polyethylene glycol octylphenyl ether into the reaction kettle, add 15 kg of deionized water and stir for 40 minutes until completely mixed; (3) Add tetrasodium ethylenediaminetetraacetate and citric acid to step (2) and continue stirring for 2 hours; (4) Add the bactericide and the remaining deionized water to step (3) and continue stirring for 30 minutes to obtain a high-efficiency and environmentally friendly organic cleaning agent for reverse osmosis membranes. The stirring rate is controlled at 200 rpm during the entire stirring process.

[0021] Example 4 The specific preparation process of the organic cleaning agent for reverse osmosis membrane is carried out according to the following steps: (1) Raw material preparation: 35 kg polyethylene glycol, 16 kg polyethylene glycol octylphenyl ether, 9 kg tetrasodium ethylenediaminetetraacetic acid, 4 kg bactericide, 12 kg citric acid, and 22 kg deionized water; (2) Add polyethylene glycol and polyethylene glycol octylphenyl ether into the reaction kettle, add 15 kg of deionized water and stir for 40 minutes until completely mixed; (3) Add tetrasodium ethylenediaminetetraacetate and citric acid to step (2) and continue stirring for 2 hours; (4) Add the bactericide and the remaining deionized water to step (3) and continue stirring for 30 minutes to obtain a high-efficiency and environmentally friendly organic cleaning agent for reverse osmosis membranes. The stirring rate is controlled at 200 rpm during the entire stirring process.

[0022] Example 5 The specific preparation process of the organic cleaning agent for reverse osmosis membrane is carried out according to the following steps: (1) Raw material preparation: 30kg polyethylene glycol, 18kg polyethylene glycol octylphenyl ether, 7kg tetrasodium ethylenediaminetetraacetic acid, 5kg bactericide, 10kg citric acid, 26kg deionized water; (2) Add polyethylene glycol and polyethylene glycol octylphenyl ether into a reaction kettle, add 20 kg of deionized water and stir for 40 minutes until completely mixed; (3) Add tetrasodium ethylenediaminetetraacetate and citric acid to step (2) and continue stirring for 2 hours; (4) Add the bactericide and the remaining deionized water to step (3) and continue stirring for 30 minutes to obtain a highly efficient and environmentally friendly organic cleaning agent for reverse osmosis membranes. The stirring rate is controlled at 250 rpm during the entire stirring process.

[0023] Comparative Example 1 The specific operation steps are the same as those in Example 5, except that polyethylene glycol is not added.

[0024] Comparative Example 2 The specific operation steps are the same as those in Example 5, except that polyethylene glycol octylphenyl ether is not added.

[0025] Comparative Example 3 The specific operation steps are consistent with those in Example 5, except that the amount of tetrasodium ethylenediaminetetraacetate is 1 kg.

[0026] Experimental Example 1 The above-mentioned Examples 1-5 and Comparative Examples 1-3 were diluted with pure water at a mass fraction ratio of 1:45, and the pH was controlled between 10-11, and then the membrane with serious fouling was cleaned, and the experimental data of the weight, pressure difference, water production, water production conductivity and desalination rate of the membrane before and after cleaning were measured. If the weight of the membrane was reduced, the pressure difference was reduced, the water production was increased, the water production conductivity was reduced, and the desalination rate was increased after cleaning, it can be seen that the cleaning agent has a good cleaning effect on microorganisms and organic matter on the membrane. The experimental results are shown in Table 1.

[0027] Table 1 Cleaning agent performance test results

[0028] It can be seen from Table 1 that the cleaning effect of the reverse osmosis system is significantly enhanced by using the cleaning agent of the present invention to clean the reverse osmosis system. It can be seen that the cleaning solution can significantly reduce the pressure before and after the reverse osmosis membrane, restore the water production and reduce the conductivity of the product, indicating that the reverse osmosis cleaning agent has excellent cleaning effects on organic matter, colloids and biological sludge, and will not cause any harm to the membrane or environmental pollution.

[0029] Compared with the cleaning effects of Examples 1-5, the cleaning effects of Comparative Examples 1-3 are significantly inferior to those of the embodiments. The reason is that when polyethylene glycol or polyethylene glycol octylphenyl ether is not added, the compatibility between the components is lacking, which in turn affects the final cleaning effect. In addition, when the amount of a certain substance added is not controlled within the required range of the scheme of the present invention, it will also affect the final treatment effect.

[0030] Although the present invention has been illustrated and described with specific embodiments, it will be appreciated that many other changes and modifications may be made without departing from the spirit and scope of the present invention. Therefore, it is intended to include all such changes and modifications within the scope of the present invention in the appended claims.

Claims

1. A reverse osmosis membrane organic cleaning agent, characterized in that: The invention is mainly prepared from the following raw materials: by weight, 20-40 parts of polyethylene glycol, 15-20 parts of polyethylene glycol octylphenyl ether, 5-10 parts of tetrasodium ethylenediaminetetraacetate, 3-8 parts of bactericide, 5-15 parts of citric acid and 20-30 parts of deionized water.

2. The organic cleaning agent for reverse osmosis membrane according to claim 1, characterized in that: Calculated by mass, the ingredients include 25-35 parts of polyethylene glycol, 16-19 parts of polyethylene glycol octylphenyl ether, 6-9 parts of tetrasodium ethylenediaminetetraacetate, 4-7 parts of bactericide, 7-12 parts of citric acid and 22-28 parts of deionized water.

3. The organic cleaning agent for reverse osmosis membrane according to claim 1, characterized in that: In parts by mass, there are 30 parts of polyethylene glycol, 18 parts of polyethylene glycol octylphenyl ether, 7 parts of tetrasodium ethylenediaminetetraacetate, 5 parts of bactericide, 10 parts of citric acid and 26 parts of deionized water.

4. The method for preparing the organic cleaning agent for reverse osmosis membrane according to any one of claims 1 to 3, characterized in that: The steps include: After polyethylene glycol and polyethylene glycol octylphenyl ether are mixed with a portion of deionized water, tetrasodium ethylenediaminetetraacetate and citric acid are added, mixed and stirred, and then a bactericide and the remaining deionized water are added.

5. The preparation method according to claim 4, characterized in that: The polyethylene glycol, polyethylene glycol octylphenyl ether and a portion of deionized water are mixed and stirred for 20-40 minutes.

6. The preparation method according to claim 4, characterized in that: The time for adding tetrasodium ethylenediaminetetraacetate and citric acid and mixing and stirring is more than 1 hour.

7. The preparation method according to claim 4, characterized in that: Add the fungicide and the remaining deionized water and continue stirring for more than 30 minutes.

8. The preparation method according to claim 4, characterized in that: The stirring speed was controlled between 200-300 rpm during the whole stirring process.

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