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Composite corrosion and scale inhibitor and its application in treating circulating cooling water

The invention relates to a technology of corrosion and scale inhibitor and application, which is applied to the composite corrosion and scale inhibitor and its application in the treatment of circulating cooling water, and can solve the problems of reducing the cooling effect of cold exchange equipment, reducing the corrosion rate, and the high corrosion rate. To achieve the effect of good corrosion and scale inhibition performance, saving pharmaceutical costs, and simple operation

Active Publication Date: 2005-05-25
中国石油化工股份有限公司北京燕山分公司研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the corrosion inhibitor formula containing zinc ions, zinc ions are easy to form zinc sulfide precipitates with sulfur ions in the water and become ineffective. Therefore, increasing the dosage of corrosion inhibitors sometimes not only does not reduce the corrosion rate, but will aggravate scaling and reduce the corrosion rate. Improve the cooling effect of cold exchange equipment
In addition, the water systems of most refineries are limited by the amount of sewage discharge, so they cannot completely replace the sulfur-containing circulating water in time, resulting in a high corrosion rate of equipment. At the same time, the amount of water treatment chemicals, fresh water consumption and sewage discharge are relatively high sharp rise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation process: prepare compound corrosion and scale inhibitor 100g

[0028] Taking by weighing 22.9g active component is 50% ATMP, 17.9g active component is 40% HPAA, 28.6g solid content about 30% AA / AMPS binary copolymer (mass ratio is AA / AMPS=70 / 30 , the limiting viscosity at 30°C is 0.072dl / g), 11.4g of PBTCA whose active component is 50%, is dissolved in 19.2g of water, fully dissolved, shaken well, and 100g of the required preparation of corrosion and scale inhibitors can be obtained agent.

[0029] When the prepared corrosion and scale inhibitor is added to the test water at a concentration of 70mg / L, the effective concentrations of ATMP, HPAA, AA / AMPS binary copolymer and PBTCA in the water are 8mg / L and 5mg / L respectively , 6mg / L, 4mg / L.

[0030] Rotating coupon corrosion test test water quality: Ca 2+ 400mg / L, total alkalinity 350mg / L, Cl - 415mg / L, S 2- 0.5mg / L, where Ca 2+ , total alkalinity in CaCO 3 Count, the same below.

[0031] Static anti-...

Embodiment 2

[0033] Preparation process: prepare compound corrosion and scale inhibitor 100g

[0034] Weigh 17.1g of HEDP with an active component of 50%, 21.4g of HPAA with a 40% active component, and 28.6g of ZF-311 with a solid content of about 30% (produced by Beijing Yanhua Xingye Technology Development Company, which is acrylic acid / acrylic acid methyl ester / hydroxypropyl acrylate terpolymer), solid content is 30% PAA (limiting viscosity number is 0.068dl / g at 30 ℃) 9.5g, dissolves in 23.4g water, makes it dissolve fully, shakes up, promptly obtains 100g of corrosion and scale inhibitors to be prepared.

[0035] When the prepared corrosion and scale inhibitors are added to the test water at a concentration of 70mg / L, the effective concentrations of HEDP, HPAA, ZF-311, and PAA in the water are 6mg / L, 6mg / L, and 6mg / L, respectively. , 2mg / L.

[0036] Rotating coupon corrosion test test water quality: Ca 2+ 285mg / L, total alkalinity 340mg / L, Cl - 210mg / L, S 2- 0.5mg / L.

[0037] St...

Embodiment 3

[0039] Preparation process: prepare compound corrosion and scale inhibitor 100g

[0040] Taking by weighing 17.1g active component is 50% HEDP, 28.6g active component is 40% HPAA, 38.1g solid content about 30% AA / AMPS / HPA terpolymer (mass ratio is AA / AMPS / HPA =60 / 20 / 20, the limiting viscosity at 30°C is 0.078dl / g), dissolved in 16.2g of water, fully dissolved, shaken well, and 100g of the required preparation of corrosion and scale inhibitors can be obtained.

[0041] When the prepared corrosion and scale inhibitors are added to the test water at a concentration of 70mg / L, the effective concentrations of HEDP, HPAA, and AA / AMPS / HPA terpolymers in the water are 6mg / L and 8mg / L respectively. , 8mg / L.

[0042] Rotating coupon corrosion test test water quality: Ca 2+ 385mg / L, total alkalinity 440mg / L, Cl - 390mg / L, S 2- 1.0mg / L.

[0043] Static anti-scaling test The test water quality is the same as in Example 1.

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Abstract

A composite corrosion-retardant scaling inhibitor contains organic phosphoic acid, organic phosphocarboxylic acid which may be the hydroxyphosphonoacetic acid or the mixture of hydroxyphosphonoacetic acid and 2-phosphono-1,2,4-butane tricarboxylate, and the homopolymer or copolymer containing carboxyl. It is specially suitable for treating the circulated cooling water containing sulfur.

Description

technical field [0001] The invention relates to a composite corrosion and scale inhibitor and its application, in particular to a composite corrosion and scale inhibitor and its application in circulating cooling water treatment. Background technique [0002] Usually, the processing of highly corrosive high-sulfur crude oil in the refining unit will cause corrosion and perforation of the equipment, and material leakage into the circulating water will occur; in addition, if the sulfur-containing gas (such as hydrogen sulfide, etc.) produced by the unit is not tightly sealed or handled properly , will leak into the atmosphere, resulting in further dissolution and absorption by the cooling water in the nearby cooling tower. After the sulfur-containing substances enter the circulating cooling water system, the water quality will deteriorate, the conventional water treatment chemicals will fail, and the corrosion and scaling of the cooling equipment in the circulating water syste...

Claims

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Application Information

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IPC IPC(8): C02F5/10C02F5/14
CPCC23F14/02
Inventor 任志峰秦会敏成敏郦和生胡艳华常磊闫岩王娜
Owner 中国石油化工股份有限公司北京燕山分公司研究院
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