Corrosion and scale inhibitor applicable to circulating cooling water high in chlorine content and bromine content

Abstract

The invention relates to a corrosion and scale inhibitor applicable to circulating cooling water high in chlorine content and bromine content. The corrosion and scale inhibitor is prepared from 4-8 parts of high explosive-dual purpose (HEDP), 1-5 parts of hydroxypropyl methacrylate (HPMA), 0.3-1.2 parts of acrylic acid-2-acrylamide-2-methyl propanesulfonic acid copolymer (AA-AMPS), 1-5 parts of zinc sulfate (ZnSO<4>) and 1-5 parts of benzotriazole (BTA). The corrosion and scale inhibitor is little in toxicity and influence on the environment, and good scale inhibition and corrosion mitigation performances in the circulating water high in chloride ion content and bromine ion content are exhibited.

Description

technical field [0001] The invention relates to a corrosion and scale inhibitor suitable for circulating cooling water with high chlorine and high bromine, and belongs to the technical field of water treatment. Background technique [0002] With the development of industry, enterprises have generally used circulating water instead of once-through water. By increasing the concentration multiple of circulating cooling water, water resources can be saved to the greatest extent. However, with the increase of concentration multiple, corrosive ions and scale-forming salts in water also Multiplied, bringing serious corrosion and scaling problems. If the corresponding measures are not taken in time, it will cause equipment corrosion, fouling, heat transfer rate decline and other consequences, which will seriously affect the normal operation of the production equipment. The most commonly used method to slow down corrosion and prevent scaling is to add corresponding corrosion and sca...

AI Technical Summary

Problems solved by technology

[0004] 1) Single action: Most chemicals cannot have good scale and corrosion inhibition properties at the same time. The scale inhibition effect is good and the corrosion inhibition performance is poor, or the corrosion inhibition performance is good and the scale inhibition performance is poor.

[0005] 2) Material limitation: the current chemicals often only have corrosion inhibition effects on one or two of carbon steel, stainless steel, brass and other materials, but there are often multiple materials in the actual circulation system

[0006] 3) Large dosage: In order to achieve a better use effect during the use of existing chemicals, it is often necessary to add a large amount of chemicals, which increases the cost of circulating water treatment for users

[0007] 4) The effect of circulating water with high concentration times is poor: the concentration ratio increases, and the concentration of various ion components in the water, such as chloride ions and hardness ions, is also higher

Existing chemicals often have no obvious effect on this type of circulating water, and may even promote corrosion and scaling

[0008] The circulating water treatment agents currently used are all used in circulating water with low chloride ion content. For circulating cooling water with high bromine and high chlorine, it is highly corrosive in actual operation. Because of its small radius, it is easy to penetrate passivation The fine pores on the surface of the membrane will cause pitting corrosion, and it will also appear as scaling. 2+ The reaction produces FeCl 2 , FeCl 2 Further hydrolysis to generate Fe(OH) 2 and HCl, causing the solution in the corrosion zone to be strongly acidic, which accelerates the corrosion rate of the metal. At the same time, chloride ions and bromide ions still cause copper pitting and corrosion cracking, while the existing scale inhibitors are often only for carbon steel and stainless steel. effect, the slow release or scale inhibition effect on copper materials is poor

[0009] Therefore, there are not only scale and corrosion inhibitors with good scale and scale inhibitory effect, but also suitable for carbon steel, stainless steel, brass and other materials. Corrosion and scale inhibitors with scale and corrosion inhibition effects have not been reported yet

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