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Low-phosphorus antiincrustation corrosion inhibitor and its use

A technology of scale and corrosion inhibitors and copolymers, which is applied in the field of low-phosphorus composite scale and corrosion inhibitors, can solve the problems of application limitations, water hardness and chemical performance limitations, etc., to reduce environmental hazards, good corrosion inhibition performance, Good overall performance

Active Publication Date: 2006-03-08
BEIJING YANHUA PETRO CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The appearance of the alkaline method facilitates on-site operation, but its application is limited by certain conditions, specifically in regional restrictions (differences in water hardness) and pharmaceutical performance restrictions
For water with low hardness (such as the water system in southern my country), the main problem is the corrosion of heat exchange equipment. Operating under alkaline conditions can slow down the progress of corrosion. Alkaline method is an ideal treatment method; but for Water with high hardness (such as groundwater in northern my country) itself needs to solve the problem of scaling, and alkaline conditions are one of the factors that cause scaling. Therefore, if water with high hardness is under alkaline conditions without adjusting the pH It is necessary to improve the scale inhibition performance of its scale inhibitor, otherwise it will be difficult to maintain a certain concentration multiple and good scale inhibition rate, but the performance of water treatment chemicals is difficult to meet this condition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Take by weighing 4.0g effective content is 50% PBTCA, sodium molybdate 8.0g, solid content is 30% T225 (30 ℃ limit viscosity number is 0.072dl / g, weight ratio is AA / HPA=80 / 20) 26.7 g, dissolved in 50.4g of water, and finally 10.9g of zinc sulfate heptahydrate was added to make it fully dissolved, and shake well to obtain 100.0g of the medicament to be prepared.

[0050] When the prepared agent is added to high-hardness, high-alkali (adjust pH 7.8-8.2 with sulfuric acid) and low-hardness, low-alkali water at a concentration of 100mg / L, PBTCA, sodium molybdate, T225, Zn 2+ The effective concentration is 2mg / L, 8mg / L, 8mg / L, 2.5mg / L respectively, total phosphorus in water (as PO 4 3- Calculated) is 0.7mg / L.

Embodiment 2

[0052] Weigh 5.0g effective content of 40% HPAA, 5.0g of sodium tungstate, and 30% solid content of AA / AMPS / HPA containing carboxylic acid group and sulfonic acid group terpolymer (at 30°C, the limiting viscosity is 0.078dl / g, the weight ratio is AA / AMPS / HPA=70 / 15 / 15) 20.0g, dissolve in 65.8g water, finally add 4.2g zinc chloride, make it fully dissolved, shake well, you can get the desired preparation 100.0g of potion.

[0053] When the prepared chemical solution is added to high-hardness, high-alkali (pH value 8.0-8.4 with sulfuric acid) and low-hardness, low-alkali test water at a concentration of 100mg / L, HPAA, sodium tungstate, and AA / AMPS / HPA terpolymer containing both carboxylic acid groups and sulfonic acid groups, Zn 2+ The effective concentration is 2mg / L, 5mg / L, 6mg / L, 2mg / L respectively, total phosphorus in water (in PO 4 3- Calculated) is 0.9mg / L.

Embodiment 3

[0055] Taking by weighing 2.5g effective content is 40% HPAA, 3.0g effective content is 50% PBTCA, sodium molybdate 8.0g, solid content is 30% T225 (at 30 ℃, limit viscosity is 0.072dl / g, weight ratio AA / HPA=80 / 20) 26.7g, dissolved in 48.9g of water, and finally 10.9g of zinc sulfate heptahydrate was added to fully dissolve, shake well, and 100.0g of the required preparation was obtained.

[0056] When the prepared chemical solution is added to high-hardness, high-alkali (adjust pH 7.8-8.2 with sulfuric acid) and low-hardness, low-alkali test water at a concentration of 100 mg / L, HPAA, PBTCA, and molybdic acid in the water will Sodium, T225, Zn 2+ The effective concentrations are 1mg / L, 1.5mg / L, 8mg / L, 8mg / L, 2.5mg / L, total phosphorus in water (in PO 4 3- Calculated) is 1.0mg / L.

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Abstract

This invention relates to a sort of low-phosphor scale-corrosion inhibitor which comprises 2-phospinobutane-1, 2, 4-tricarboylic acid (PBTCA) (or / and 2-hydroxyphonoacetic acid (HPAA)), zinc salts, molyadate or tungstate and carboxyl-containing copolymer, copper corrosion inhibitor (needed or not conditionally). This low-phosphor scale-corrosion inhibitor can be used to treat recirculated cooling-water in ways such as adjusting pH of high-hardness and high-alkalinity water or treating low-alkalinity and low-hardness water. Its phosphor concentration in recirculated water is no more than 1mg / L, reducing the hazard of phosphor discharge to environment.

Description

technical field [0001] The invention relates to a low-phosphorus composite scale and corrosion inhibitor and its application in circulating cooling water treatment. Background technique [0002] Circulating cooling water treatment mainly solves the three problems of scaling, corrosion and microbial hazards in the circulating water system. In order to achieve this purpose, a water treatment formula suitable for water quality conditions must be screened out. The water treatment formula has been developed from the earliest chromium and phosphorus systems to all-organic, organic zinc salt and molybdenum system formulas; the circulating water treatment method has also transitioned from a single acidic method that inhibits corrosion to an alkaline method that does not adjust the pH value. Table 1 lists the development process of cooling water treatment formulations in Japan. [0003] Era corrosion inhibitor Inhibitor 1950-1959 Polyphosphate...

Claims

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Application Information

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IPC IPC(8): C02F5/14
CPCC23F11/08C23F14/02
Inventor 郦和生郭红卫张春原
Owner BEIJING YANHUA PETRO CHEM
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