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Composite corrosion and scale inhibitor and application thereof

A technology of corrosion and scale inhibitors and corrosion inhibitors, applied in the fields of scale removal and water softening, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of limited use of high phosphorus-containing chemical formulations, etc. Achieve the best corrosion and scale inhibition effect, environmental friendliness and excellent performance

Active Publication Date: 2017-02-22
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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  • Composite corrosion and scale inhibitor and application thereof
  • Composite corrosion and scale inhibitor and application thereof
  • Composite corrosion and scale inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Weigh 2.6g of stearic acid, 66.7g of acrylic acid and acrylamide copolymer with an active substance content of 30% by weight (at 30°C, the limiting viscosity is 0.072dl / g, the molar ratio of acrylic acid to acrylamide=4 / 1), 35g of polyaspartic acid with an active substance content of 40% by weight and 1.7g of zinc sulfate monohydrate were dissolved in 94.1g 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.

[0047] Weigh 2.6g of stearic acid, 66.7g of acrylic acid and acrylamide copolymer with an active substance content of 30% by weight (at 30°C, the limiting viscosity is 0.072dl / g, the molar ratio of acrylic acid to acrylamide=4 / 1), 35g of polyaspartic acid with an active substance content of 40% by weight was dissolved in 95.7g of wa...

Embodiment 2

[0049] Take by weighing 2.2g sodium stearate, 81.5g active substance content be the maleic anhydride and acrylamide and methyl acrylate copolymer (30 ℃ limit viscosity number is 0.077dl / g, maleic anhydride and acrylamide Molar ratio with methyl acrylate=1.5 / 0.6 / 0.4), 33.3g of polyepoxysuccinic acid with an active substance content of 40% by weight was dissolved in 83g of water to prepare a corrosion and scale inhibitor.

[0050] 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 2.0mg / L test water.

Embodiment 3

[0052] Take by weighing 2.7g potassium stearate, 54.6g active substance content be the maleic anhydride and acrylamide copolymer (30 ℃ limit viscosity number is 0.081dl / g, the mol ratio of maleic anhydride and acrylamide = 3 / 1), 48.5g of polyacrylic acid with an active substance content of 30% by weight, and 1.1g of zinc chloride were dissolved in 93.1g 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 110mg / L test water.

[0053] Take by weighing 2.7g potassium stearate, 54.6g active substance content be the maleic anhydride and acrylamide copolymer (30 ℃ limit viscosity number is 0.081dl / g, the mol ratio of maleic anhydride and acrylamide = 3 / 1), 48.5g of polyacrylic acid with an active substance content of 30% by weight was dissolved in 94.2g of water to prepare a corrosion and scale inhibitor. Add the prepared chemicals to test water 2 and 3 respectively, s...

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Abstract

The invention relates to the field of chemical cleaning and discloses a composite corrosion and scale inhibitor. The composite corrosion and scale inhibitor comprises stearic corrosion inhibiting agents, dispersing agents and scale inhibiting agents, wherein the stearic corrosion inhibiting agents are selected from stearic acid and / or stearate, the dispersing agents comprise copolymers of constitutional units provided by acrylamide, and the scale inhibiting agents are non-phosphorus homopolymers. The invention further discloses application of the composite corrosion and scale inhibitor in circulating cooling water treatment. The composite corrosion and scale inhibitor has the advantages that excellent corrosion and scale inhibiting effects can be obtained in the absence of phosphorous components, and excellent property and environment-friendliness are realized.

Description

technical field [0001] The invention relates to a composite corrosion and scale inhibitor and its 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 formula of organic phosphine + ...

Claims

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Application Information

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IPC IPC(8): C02F5/10
Inventor 吴颖郦和生秦会敏楼琼慧张春原
Owner CHINA PETROLEUM & CHEM CORP
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