A kind of corrosion inhibitor and composite corrosion and scale inhibitor and their application

A technology of corrosion and scale inhibitor and corrosion inhibitor, which can be used in descaling and water softening, chemical instruments and methods, water/sludge/sewage treatment, etc. To achieve the effect of environmental friendliness and excellent performance

Active Publication Date: 2018-07-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the eutrophication of water bodies due to the discharge of phosphorus, the use of high phosphorus formulations is increasingly limited

Method used

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  • A kind of corrosion inhibitor and composite corrosion and scale inhibitor and their application
  • A kind of corrosion inhibitor and composite corrosion and scale inhibitor and their application
  • A kind of corrosion inhibitor and composite corrosion and scale inhibitor and their application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Weigh 2.6g of stearic acid and 66.7g of a copolymer of acrylic acid and acrylamide with an active content of 30% by weight (at 30°C, the limiting viscosity is 0.072dl / g, and the molar ratio of acrylic acid to acrylamide=4 / 1) 10g of hydroxyethylidene diphosphonic acid with an active substance content of 50% by weight and 1.7g of zinc sulfate monohydrate were dissolved in 119.1g of water to prepare a corrosion and scale inhibitor. Add the prepared medicament to the test water 1 so that the concentration of the corrosion and scale inhibitor is 100mg / L test water. And add benzotriazole to the test water 1 so that the effective concentration is 1 mg / L test water.

[0049] Weigh 2.6g of stearic acid and 66.7g of a copolymer of acrylic acid and acrylamide with an active content of 30% by weight (at 30°C, the limiting viscosity is 0.072dl / g, and the molar ratio of acrylic acid to acrylamide=4 / 1) 10 g of hydroxyethylidene diphosphonic acid with an active substance content of 50...

Embodiment 2

[0051] Take by weighing 2.2g sodium stearate, 81.5g active substance content be the copolymer of maleic anhydride, acrylamide and methyl acrylate (at 30 ℃, limit viscosity number is 0.077dl / g, maleic anhydride and propylene The molar ratio of amide to methyl acrylate=1.5 / 0.6 / 0.4), 8.89g of aminotrimethylene phosphonic acid with an active substance content of 50% by weight were dissolved in 107.4g of water to prepare a corrosion and scale inhibitor.

[0052] Add the prepared medicament to the test water 2, so that the concentration of the corrosion and scale inhibitor is 90 mg / L test water. And add mercaptobenzothiazole to the test water 2 so that the effective concentration is 2 mg / L test water.

Embodiment 3

[0054] Take by weighing 2.7g potassium stearate, 54.6g active substance content be the copolymer of maleic anhydride and acrylamide (at 30 ℃, limit viscosity is 0.081dl / g, the mol ratio of maleic anhydride and acrylamide is 30% by weight) =3 / 1), 10.9g active matter content is 2-phosphonic acid group-1,2,4-tricarboxylic acid butane of 50% by weight, 1.1g zinc chloride is dissolved in 130.7g water and is made into corrosion inhibitor and scale inhibitor potion. Add the prepared medicament to the test water 1 so that the concentration of the corrosion and scale inhibitor is 110mg / L test water.

[0055] Take by weighing 2.7g potassium stearate, 54.6g active substance content be the copolymer of maleic anhydride and acrylamide (at 30 ℃, limit viscosity is 0.081dl / g, the mol ratio of maleic anhydride and acrylamide is 30% by weight) =3 / 1), 10.9g of 2-phosphonic acid-1,2,4-tricarboxylic butane with an active substance content of 50% by weight was dissolved in 131.8g of water to prep...

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Abstract

The present invention relates to the field of chemical industry washing, and discloses a corrosion inhibitor, which comprises a stearic acid type corrosion inhibitor and a dispersant, wherein the stearic acid type corrosion inhibitor is stearic acid and / or stearate, and the dispersant is a copolymer containing a structural unit provided by acrylamide. The invention further discloses a composite corrosion-inhibition scale inhibitor, which contains the corrosion inhibitor and a scale inhibitor. The invention further discloses applications of the corrosion inhibitor and the composite corrosion-inhibition scale inhibitor in circulating cooling water treatment. According to the present invention, the excellent corrosion inhibition and scale inhibition effect can be achieved in the case of the use of the small amount of the phosphorus-containing scale inhibitor, and the advantages of excellent performance and environmental protection can be provided.

Description

technical field [0001] The invention relates to a corrosion inhibitor, a composite corrosion and scale inhibitor and their application in circulating cooling water treatment. Background technique [0002] The three major problems that need to be solved during the operation of circulating cooling water are corrosion, scaling and microbial growth. Corrosion and fouling are two opposite trends that are closely related to each other. Finding the balance between these two trends is the key to solving these two problems. The control of microorganisms is mainly achieved by fungicides. When the control is unstable, biological slime will grow and adhere to the surface of the heat exchanger. The increase in the adhesion rate will affect the heat exchange efficiency and cause corrosion of the heat exchanger. [0003] For water with medium hardness and medium alkalinity, the pH value natural operation formula is usually used, and the system pH value can reach 9.0. Generally, the formul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/14C23F11/10
CPCC23F11/08C23F14/02
Inventor 郦和生吴颖秦会敏楼琼慧张春原
Owner CHINA PETROLEUM & CHEM CORP
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