Reverse osmosis membrane scale inhibitor and preparation method thereof

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...

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.