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A kind of compound modification reagent and preparation method thereof

A compound modification and reagent technology, applied in chemical instruments and methods, reverse osmosis, membranes, etc., can solve the problems of difficult cleaning, fouling reverse osmosis membranes, membrane fouling, etc., achieving low cost, increasing membrane water permeability, inhibiting The effect of electrostatic adsorption

Active Publication Date: 2018-03-02
CHENGDU MEIFUTE MEMBRANE TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the organic matter and colloids in the wastewater are charged, and these pollutants will be adsorbed on the negatively charged reverse osmosis membrane surface, causing the membrane to be polluted and difficult to clean
In addition, cationic polymers may also react with charged antiscalants to form insoluble polymers, fouling reverse osmosis membranes

Method used

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  • A kind of compound modification reagent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The composite modification reagent consists of 7-20 mass percent polyvinyl alcohol, 2-15 mass percent maleic anhydride, 0.1-1 mass percent cumene peroxide and 0-3.8 mass percent polyvinyl alcohol The solute composed of vinylpyrrolidone is uniformly dissolved in an ultrapure water solvent. Wherein, the molecular weight of the polyvinyl alcohol is 250,000-300,000, and the molecular weight of the polyvinylpyrrolidone is 500,000-1.2 million.

[0017] During preparation, dissolve each component of the above-mentioned composite modification reagent solute in proportion in an ultrapure water solvent with a temperature of 80±3°C, and use a constant speed stirrer to mix the above mixed solution at a speed of 75~150rad / min. Stir for 15-25 minutes to fully mix the components and form a sticky state. Ready to use.

[0018] When in use, within the temperature range of 25±3°C, evenly coat the composite modifying reagent on the surface of the reverse osmosis membrane for 0.5~20 minu...

Embodiment 2

[0020] The difference between this embodiment and embodiment 1 is:

[0021] Described compound modification reagent is uniformly dissolved in the solute that the polyvinyl alcohol of 15% mass percentage, the maleic anhydride of 9% mass percentage, the cumene peroxide of 0.5% mass percentage and the polyvinylpyrrolidone of 1.9% mass percentage constitute Made in ultrapure water solvent.

Embodiment 3

[0023] The difference between this embodiment and embodiment 1 is:

[0024] The composite modifying reagent is prepared by uniformly dissolving a solute composed of 18% by mass polyvinyl alcohol, 12% by mass of maleic anhydride, and 1% by mass of cumene peroxide in an ultrapure water solvent.

[0025] The Zeta potential and hydrophilic contact angle of the membrane were measured with a potentiometer and a hydrophilic contact angle meter before and after the reverse osmosis membrane was coated with a composite modifying reagent. The obtained data are shown in Table 1 below:

[0026]

[0027] Table 1

[0028] It can be seen that the composite modification reagent of the present invention can effectively improve the surface charge and hydrophilic performance of the reverse osmosis membrane, thereby improving its anti-pollution performance and water permeability, and then enhancing the performance of the reverse osmosis membrane, which can reduce the number of membrane cleaning...

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Abstract

The invention discloses a composite modifying reagent, which is composed of the following components in percentage by weight: 7 to 20% of polyvinyl alcohol, 2 to 15% of maleic anhydride, 0.1 to 1% of dicumyl peroxide, and 0 to 3.8% of polyvinylpyrrolidone; and also provides a preparation method of the composite modifying agent. According to the preparation method, the components mentioned above are uniformly dissolved into an ultrapure water solvent so as to prepare the composite modifying agent. The produced composite modifying reagent can be used to carry out chemical modification on the surface of a reverse osmosis membrane. By controlling the Zeta electric potential of the reverse osmosis membrane surface in a range of 0 to -12 mV, the electrostatic absorption of charge pollutants on the reverse osmosis membrane surface can be effectively inhibited, the anti-pollution performance of the reverse osmosis membrane is improved, at the same time the hydrophilicity of reverse osmosis membrane surface is improved, and the water permeability rate of the membrane is increased.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a compound modification reagent. Background technique [0002] The principle of reverse osmosis technology is to separate these substances from water based on the fact that other substances cannot pass through the semi-permeable membrane under the action of the osmotic pressure higher than the solution. The membrane pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in water. The system has the advantages of good water quality, low energy consumption, no pollution, simple process and easy operation. It can be seen that reverse osmosis membrane is the core component of reverse osmosis technology, and the effect of reverse osmosis water treatment is directly related to the quality of reverse osmosis membrane. [0003] Most of the organic matter and colloids in the wastewater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D61/02
CPCB01D61/025B01D67/0093B01D2323/36
Inventor 宋岱峰韩亮
Owner CHENGDU MEIFUTE MEMBRANE TECHNOLOGY CO LTD