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Reverse osmosis membrane scale inhibitor and preparation method thereof

A technology of reverse osmosis membrane and scale inhibitor, which is applied in the field of reverse osmosis membrane scale inhibitor and its preparation, can solve the problems of membrane fouling, fouling on the permeable membrane surface, etc., and achieves the effect of high scale inhibition performance

Inactive Publication Date: 2014-05-07
NANTONG SUTONG SEPARATION ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Scaling occurs on the surface of the permeable membrane, causing fouling of the membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A reverse osmosis membrane antiscalant, comprising in parts by weight: 256 parts of aminotrimethylene phosphonic acid, 8 parts of acrylic acid, 6 parts of styrene sulfonic acid, 3 parts of polyaspartic acid, 35 parts of hydrolyzed polymaleic anhydride, 2 parts of polyepoxysuccinic acid and 8 parts of polylactic acid, wherein the molecular weight of the polylactic acid used is 8000.

[0011] Add the above components into the reaction kettle, start the stirring motor, stir for 60 minutes, then let it stand for 5 minutes, and then filter the mixed solution to obtain the reverse osmosis membrane scale inhibitor.

[0012] The resulting reverse osmosis membrane antiscalant has a low concentration of calcium (Ca 2+ 280mg / L), the scale inhibition rate is 100%, for high concentration calcium (Ca 2+ 60000mg / L), the scale inhibition rate is 72.5%, the light transmittance of the dispersed iron oxide test is 79.2%, and the corrosion rate is 0.0022mm / a.

Embodiment 2

[0014] A reverse osmosis membrane antiscalant, comprising in parts by weight: 36 parts of aminotrimethylene phosphonic acid, 15 parts of acrylic acid, 12 parts of styrenesulfonic acid, 10 parts of polyaspartic acid, 48 parts of hydrolyzed polymaleic anhydride, 5 parts of polyepoxysuccinic acid and 20 parts of polylactic acid, wherein the molecular weight of polylactic acid used is 1000.

[0015] Add each component into the reaction kettle, start the stirring motor, stir for 90 minutes, let it stand for 10 minutes, and then filter the mixture to obtain the product.

[0016] The resulting reverse osmosis membrane antiscalant has a low concentration of calcium (Ca 2+ 280mg / L), the scale inhibition rate is 100%, for high concentration calcium (Ca 2+ 60000mg / L), the scale inhibition rate is 75.8%, the light transmittance of the dispersed iron oxide test is 69.3%, and the corrosion rate is 0.0015mm / a.

Embodiment 3

[0018] A reverse osmosis membrane antiscalant, comprising in parts by weight: 28 parts of aminotrimethylene phosphonic acid, 11 parts of acrylic acid, 9 parts of styrene sulfonic acid, 7 parts of polyaspartic acid, 42 parts of hydrolyzed polymaleic anhydride, 3 parts of polyepoxysuccinic acid and 13 parts of polylactic acid, wherein the molecular weight of polylactic acid used is 5000.

[0019] Add each component into the reaction kettle, start the stirring motor, stir for 80 minutes, then let it stand for 8 minutes, and then filter the mixture to obtain the product.

[0020] The resulting reverse osmosis membrane antiscalant has a low concentration of calcium (Ca 2+ 280mg / L), the scale inhibition rate is 100%, for high concentration calcium (Ca 2+ 60000mg / L), the scale inhibition rate is 89.6%, the light transmittance of the dispersed iron oxide test is 65.9%, and the corrosion rate is 0.0012mm / a.

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Abstract

The invention provides a reverse osmosis membrane scale inhibitor and a preparation method thereof. The scale inhibitor comprises the following components in parts by weight: 25-36 parts of amino trimethylene phosphonic acid (ATMP), 8-15 parts of acrylate, 6-12 parts of benzylethylene sulfonated acid, 3-10 parts of poly-L-aspartic acid, 35-48 parts of hydrolyzed polymaleic anhydride, 2-5 parts of polyepoxysuccinic acid, and 8-10 parts of polylactic acid; the preparation method of the reverse osmosis membrane scale inhibitor comprises the steps of firstly, adding all the components into a reaction kettle, starting a stirring motor, stirring for 60-90 minutes and standing for 5-10 minutes, and then filtering the mixed solution, thus obtaining the reverse osmosis membrane scale inhibitor. The reverse osmosis membrane scale inhibitor is high in scale inhibition property and applicable to high hard water, contains sterile component to ensure that bacteria and algae cannot breed on the membranes, and has multiple properties of bacteria inhibition, corrosion inhibition and scale inhibition.

Description

technical field [0001] The invention belongs to the technical field of water treatment chemicals, and in particular relates to a reverse osmosis membrane scale inhibitor and a preparation method thereof. Background technique [0002] The reverse osmosis membrane is the core component of the desalination system. Once the reverse osmosis system is blocked by particles, colloids and insoluble salts, it will not only seriously affect the water production of the membrane, reduce the desalination rate, but also greatly reduce the life of the membrane. In the case of severe fouling, the service life of the reverse osmosis membrane is only one year, or even shorter. The particles or colloids that cause reverse osmosis membrane fouling often include bacteria, sludge, colloidal silicon, iron corrosion products, etc. The chemicals used in the pretreatment part of the desalinated water system, such as polyaluminum and ferric chloride or cationic polyelectrolytes, if they cannot ...

Claims

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Application Information

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IPC IPC(8): B01D65/08
Inventor 葛红军徐丽梅杨伟东邱玉梅沙嘉敏
Owner NANTONG SUTONG SEPARATION ENG & TECH
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