Composite corrosion and scale inhibitor, and its application in circulating cooling water treatment

A technology of corrosion and scale inhibitors and additives, applied in water/sludge/sewage treatment, descaling and water softening, chemical instruments and methods, etc., can solve the problems of high total phosphorus concentration, no report on oxalic acid research, phosphorus discharge restrictions And other issues

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above formulas can solve different problems for different water quality, but they all have the problem of high total phosphorus concentration. With the stricter national environmental protection standards, phosphorus discharge is increasingly restricted, and low phosphorus or phosphorus-free formulas have become a trend
At present, more and more people are paying attention to the development of environmentally friendly corrosion inhibitors such as molybdate and tungstate, but the research on oxalic acid as a corrosion inhibitor has not been reported yet.

Method used

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  • Composite corrosion and scale inhibitor, and its application in circulating cooling water treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Take by weighing 18.0g oxalic acid, 6.6g zinc sulfate heptahydrate, 15.0g active matter content and be 30% by weight maleic anhydride and styrene sulfonic acid copolymer (at 30 ℃, limit viscosity is 0.072dl / g, maleic anhydride and The weight ratio of styrene sulfonic acid = 70 / 30), 16.0 g of glutamic acid with an active content of 50% by weight, dissolved in 42.7 g of water to prepare a corrosion and scale inhibitor.

[0059] Add the prepared medicament to the test water 1, so that the concentration of the corrosion and scale inhibitor is 35 mg / L test water.

Embodiment 2

[0061] Weigh 20.0g of sodium oxalate, 3.15g of anhydrous zinc chloride, 20.0g of acrylic acid and styrene sulfonic acid copolymer with an active substance content of 30% by weight (the limiting viscosity at 30°C is 0.072dl / g, acrylic acid and styrene The weight ratio of sulfonic acid=70 / 30), 33.3g of polyacrylic acid with an active substance content of 30% by weight (at 30°C, the limiting viscosity is 0.072dl / g, and the weight average molecular weight is 3000) are dissolved in 23.55g of water to form a slow Corrosion and scale inhibitors.

[0062] Add the prepared agent to the test water 2 (adjust the pH value to 7.8-8.2 with sulfuric acid), so that the concentration of the corrosion and scale inhibitor is 40mg / L test water.

Embodiment 3

[0064] Weigh 25.0g of potassium oxalate, 6.6g of zinc sulfate heptahydrate, and 23.3g of ethyl acrylate and styrenesulfonic acid copolymer with an active content of 30% by weight (at 30°C, the limiting viscosity is 0.072dl / g, ethyl acrylate The weight ratio to styrene sulfonic acid = 70 / 30), 18.0g of active matter content of 50% by weight hydroxyethylidene diphosphonic acid was dissolved in 27.1g of water to prepare corrosion and scale inhibitors.

[0065] Add the prepared agent to test water 1 and 2 (adjust the pH value to 7.8-8.2 with sulfuric acid), so that the concentration of corrosion and scale inhibitor is 45mg / L test water.

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Abstract

The invention discloses a composite corrosion and scale inhibitor, and its application in circulating cooling water treatment. The composite corrosion and scale inhibitor contains oxalic acid and/or oxalate, a sulfonic group-containing copolymer, a scale inhibition additive and a zinc salt, the scale inhibition additive is at least one of organic phosphonic acid, phosphorus-free polycarboxylic acid and phosphorus-free polyacid anhydride, and a weight ratio of oxalic acid and/or oxalate to the sulfonic group-containing copolymer to the scale inhibition additive to the zinc salt by zinc ion is 10-30:2.5-5.5:2-12:1. The composite corrosion and scale inhibitor contains no phosphorus or has a low concentration of total phosphorus, is environmentally-friendly, and is especially suitable for circulating water with the sum of the total alkalinity and the total hardness of above 100mg. The above zinc salt formula containing oxalic acid and/or oxalate realize excellent scale and corrosion inhibition effects.

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] Corrosion inhibition, scale inhibition and microbial control are the three major problems to be solved in circulating water treatment. Microbial control is achieved by adding fungicides, and corrosion and scale inhibition is achieved by adding composite scale and corrosion inhibitors. [0003] For low-hardness and low-alkali water quality, the natural pH value is used to operate the process, and the water treatment formula focuses on corrosion inhibition. Generally, the formula of phosphate + organic phosphonic acid + sulfonate copolymer + zinc salt is used. [0004] For high hardness and high alkali water quality, one treatment method is to adjust the pH value process, focusing on solving the corrosion problem of the system, that is, by adding H 2 SO 4 To control the pH value of the circulating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10
Inventor 楼琼慧郦和生秦会敏李博伟
Owner CHINA PETROLEUM & CHEM CORP
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