Reverse osmosis membrane scale inhibitor and preparation method thereof

A technology of reverse osmosis membrane and scale inhibitor, which is applied in the composition and preparation of reverse osmosis membrane scale inhibitor, which can solve the problems of reduced membrane flux and water production efficiency, reduced membrane service life, and increased water supply pressure.

Active Publication Date: 2015-01-07
SHANDONG TIANQING TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the reverse osmosis desalination process, once scaling and fouling occur, it will lead to a decrease in membrane flux and water production efficiency, and increase water supply pressure. The high pH in the reverse osmosis fouling area will also accelerate the hydrolysis of some membrane materials, reducing the Membrane service life
Usually in CaCO 3 After a few days of fouling, the desalination rate will drop, which will not only seriously affect the water production of the membrane, but also greatly reduce the life of the membrane. In the case of severe fouling, the life of the reverse osmosis membrane is only one year, or even longer. short
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 be Effective removal in pools or media filters, may also cause fouling of membranes
In addition, when insoluble salts are continuously concentrated in the membrane element and exceed their solubility limit, they will scale on the surface of the reverse osmosis membrane, resulting in fouling of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Rinse the reactor clean, dissolve 70kg of sodium propylene sulfonate in 200kg of deionized water, add the solution from the bottom of the reactor to the reactor, add 280kg of maleic anhydride from the manhole, and add 15g of vanadium pentoxide. Turn on the stirring, turn on the heating device, and slowly increase the temperature to 100°C.

[0022] 2. Mix 20kg of acrylamide and 100kg of deionized water, use a vacuum pump to pump the solution into the head tank 1, use a vacuum pump to pump 80kg of hydroxypropyl acrylate into the head tank 2, and use a vacuum pump to pump 250kg of hydrogen peroxide to the head tank 3 middle. At the same time, slowly add dropwise, control the temperature between 100-110° C., and add dropwise for 4 hours.

[0023] 3. Control the temperature between 100-105°C and keep it warm for 1.5 hours.

[0024] 4. Turn on the cooling water to lower the temperature below 50°C, and put the obtained polymer into a packaging barrel for later use.

[00...

Embodiment 2

[0030] 1. Rinse the reactor clean, dissolve 80kg of sodium propylene sulfonate into 180kg of deionized water, add the solution into the reactor from the bottom of the reactor, add 300kg of maleic anhydride from the manhole, add 7g of vanadium pentoxide and 8g of sulfurous acid iron. Turn on the stirring, turn on the heating device, and slowly increase the temperature to 100°C.

[0031] 2. Mix 50kg of acrylamide and 60kg of deionized water, use a vacuum pump to pump the solution into the head tank 1, use a vacuum pump to pump 90kg of hydroxypropyl acrylate into the head tank 2, and use a vacuum pump to pump 240kg of hydrogen peroxide to the head tank 3 middle. Add dropwise at the same time, control the temperature between 100-110°C, and add dropwise for 4 hours.

[0032] 3. Control the temperature between 100-105°C and keep it warm for 1.5 hours.

[0033] 4. Turn on the cooling water to lower the temperature below 50°C, and put the obtained polymer into a packaging barrel fo...

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PUM

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Abstract

The invention provides a reverse osmosis membrane scale inhibitor and a preparation method thereof. The reverse osmosis membrane scale inhibitor is prepared mainly by organic phosphonic acid and/or a phosphino-carboxylic acid compound, quadripolymer, isothiazolinone and deionized water. The scale inhibitor comprises main components including acrylamide, sulfonate, acrylic ester and maleic anhydride quadripolymer, wherein the copolymer contains multiple functional groups and has very good scale inhibition and dispersion functions on different fouling substances, and tests prove that the scale inhibitor has a protection function on CaSO4, CaCO3, SiO2, CaF2, BaSO4, SrSO4, Ca3(PO4)2 and bacterial fouling.

Description

technical field [0001] The invention belongs to the technical field of water treatment chemicals, and in particular relates to a composition of a reverse osmosis membrane scale inhibitor and a preparation method thereof. Background technique [0002] The large-scale application of membrane separation technology started from the seawater desalination project in the 1960s. The reverse osmosis membrane is the core component of the desalinated water system, and there is a problem of reverse osmosis membrane fouling during operation. The pollution of reverse osmosis membrane is divided into chemical pollution, biological pollution, colloidal pollution and particle pollution. In the reverse osmosis desalination process, once fouling and fouling occur, the membrane flux and water production efficiency will decrease, and the water supply pressure will increase. The high pH in the reverse osmosis fouling area will also accelerate the hydrolysis of some membrane materials, reducing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/08
Inventor 柴斌王俊明王金明刘文峰胡新霞刘晓民高云峰丁青山张华谢泽新
Owner SHANDONG TIANQING TECH DEV
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