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Phosphorus-free composite scale-inhibiting corrosion-retarding agent and application thereof in water treatment

A technology of scale and corrosion inhibitor, scale inhibitor and dispersant, which is applied in the application field of circulating cooling water treatment, can solve the problem of large amount of borate, etc., and achieves the comprehensive performance, excellent CaCO3 scale performance, and good corrosion inhibition performance. Effect

Inactive Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the demineralized water is used for the circulating cooling water of the blast furnace wall and hot blast stove, it can prevent the demineralized water from corroding the equipment. The disadvantage is that the amount of borate is too large

Method used

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  • Phosphorus-free composite scale-inhibiting corrosion-retarding agent and application thereof in water treatment
  • Phosphorus-free composite scale-inhibiting corrosion-retarding agent and application thereof in water treatment
  • Phosphorus-free composite scale-inhibiting corrosion-retarding agent and application thereof in water treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Weigh 98.3g sodium tetraborate decahydrate (containing B 4 o 7 2- 40.7%), 25.0 g of polyaspartic acid (number average molecular weight: 3000) with a solid content of 40% were added to 76.7 g of water, and shaken to obtain 200.0 g of the required preparation.

[0066] When the prepared medicine is added to the test water 1 at a concentration of 200mg / L, the water B 4 o 7 2- , The effective concentration of polyaspartic acid is 40mg / L, 10mg / L respectively.

Embodiment 2

[0068] Weigh 66.3 sodium octaborate tetrahydrate (containing B 4 o 7 2- 37.7%) and 45.0 g of polyepoxysuccinic acid (number-average molecular weight 1000) with a solid content of 40% were added to 88.7 g of water, and shaken to obtain 200.0 g of the medicament solution to be prepared.

[0069] When the prepared drug solution is added to the test water 1 at a drug concentration of 200mg / L, B in the water 4 o 7 2- , The effective concentrations of polyepoxysuccinic acid are 25mg / L and 18mg / L respectively.

Embodiment 3

[0071] Weigh 83.3g potassium tetraborate pentahydrate (containing B 4 o 7 2- 48.0%) and 53.3g of polyacrylic acid (number average molecular weight: 3000) with a solid content of 30% were dissolved in 63.4g of water and shaken up to obtain 200.0g of the medicament solution to be prepared.

[0072] When the prepared drug solution is added to the test water 1 at a drug concentration of 200mg / L, B in the water 4 o 7 2- , The effective concentration of polyacrylic acid is 40mg / L, 16mg / L respectively.

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Abstract

The invention relates to a phosphorus-free composite scale-inhibiting corrosion-retarding agent and an application thereof. The phosphorus-free composite scale-inhibiting corrosion-retarding agent comprises a water-soluble borate and at least one scale-inhibiting dispersant, wherein the scale-inhibiting dispersant is a carboxylic-group-containing phosphorus-free polymer. The comprehensive property of the phosphorus-free composite scale-inhibiting corrosion-retarding agent is good. The agent has good CaCO3 scale inhibiting performance, good stabilizing performance upon Zn<2+> in water, and good corrosion retarding performance. The agent can be used in treating circulating cooling water. With the agent, harm of phosphorus discharging to the environment can be solved.

Description

technical field [0001] The invention relates to a phosphorus-free composite scale and corrosion inhibitor and its application, more particularly to a borate-containing phosphorus-free composite scale and corrosion inhibitor and its application in circulating cooling water treatment. Background technique [0002] In the circulating cooling water system, there are mainly three problems of scaling, corrosion and microbial hazards. The most convenient and effective way to prevent system scaling and corrosion is to add corrosion and scale inhibitors to the circulating cooling water. At present, most of the formulas commonly used in the treatment of circulating cooling water in China are phosphine-based formulas, and the main agent is containing phosphonic acid groups (-PO 3 h 2 ) Corrosion and scale inhibitors directly connected to carbon atoms, often called organic phosphonic acids. They mainly include: hydroxyethylidene diphosphonic acid (HEDP), aminotrimethylene phosphonic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C02F5/12
CPCC23F11/08C23F14/02
Inventor 郦和生楼琼慧秦会敏李博伟张春原
Owner CHINA PETROLEUM & CHEM CORP
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