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Compound scale and corrosion inhibitor and application thereof in treatment of circulating cooling water

A technology of scale and corrosion inhibitors and compounds, applied in the field of composite scale and corrosion inhibitors and their application in circulating cooling water treatment, to avoid environmental problems, meet the requirements of scale and corrosion inhibition, good scale and corrosion inhibition performance effect

Inactive Publication Date: 2017-05-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite scale and corrosion inhibitor not only meets the requirements of circulating cooling water for scale and corrosion inhibition, but also solves the environmental problems caused by the phosphorus-containing chemicals in the existing phosphorus-containing circulating cooling water

Method used

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  • Compound scale and corrosion inhibitor and application thereof in treatment of circulating cooling water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 6.0g chitosan (deacetylation degree is 78%), 10.0g carboxymethyl lignin (purchased from Tianjin Huixinde Chemical Product Sales Co., Ltd.) and 18.0g polyepoxysuccinic acid (limited at 30°C) respectively. Viscosity number is 0.078dl / g), was added into 66.0g of water, and shaken well to obtain composite scale and corrosion inhibitor stock solution S1.

[0044] Take 1g of the prepared composite scale and corrosion inhibitor stock solution S1 and add it to 10L of test water 1, so that the effective concentrations of chitosan (deacetylation degree is 78%), carboxymethyl lignin and polyepoxysuccinic acid in the water are respectively 6mg / L, 10mg / L and 9mg / L, and then carry out the calcium carbonate scale inhibition performance test and corrosion inhibition performance test according to the method in the test example.

Embodiment 2

[0046] Weigh 3.14g of zinc chloride, dissolve it in 9.0g of polyaspartic acid (at 30°C, the limiting viscosity number is 0.074dl / g), then add 3.0g of carboxymethyl chitosan and 18.0g of carboxymethyl cellulose (purchased from Jinye Industrial Co., Ltd., Renqiu, Hebei), and then add 46.86g of water, and shake well to obtain the composite scale and corrosion inhibitor stock solution S2.

[0047] Take 0.8g of the prepared composite scale and corrosion inhibitor stock solution S2 and add it to 10L of test water 2 or 10L of test water 3, so that carboxymethyl chitosan, carboxymethyl cellulose, polyaspartic acid and zinc ions in the water The effective concentrations are 3mg / L, 18mg / L, 4.5mg / L and 1.5mg / L respectively, and then the calcium carbonate scale inhibition performance is determined according to the method in the test example.

[0048] Use sulfuric acid to adjust the pH value of the test water 2 to 7.8-8.3, then add the compound scale and corrosion inhibitor stock solution ...

Embodiment 3

[0050] 0.16g hydroxyethyl chitosan, 60.0mg sodium lignosulfonate (purchased from Jinan Liangfeng Trading Co., Ltd.), 0.12g polyaspartic acid (limiting viscosity at 30°C is 0.079dl / g) and 10.0mg of benzotriazole were added into 10L of test water 1, so that the effective concentrations of hydroxyethyl chitosan, sodium lignosulfonate, polyaspartic acid and benzotriazole in the water were 16mg / L, respectively. 6mg / L, 6mg / L and 1mg / L, and then measure the calcium carbonate scale inhibition performance and corrosion inhibition performance according to the method in the test example.

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Abstract

The invention relates to the fields of scale and corrosion inhibition and circulating water treatment, and discloses a compound scale and corrosion inhibitor; the compound scale and corrosion inhibitor contains water soluble chitosan and / or a derivative thereof, a plant natural high-molecular compound and / or a derivative thereof and polyaspartic acid and / or polyepoxysuccinic acid. In the compound scale and corrosion inhibitor, the weight ratio of water soluble chitosan and / or the derivative thereof to the plant natural high-molecular compound and / or the derivative thereof to polyaspartic acid and / or polyepoxysuccinic acid is (2-20) to (2-25) to (5-25). The invention also discloses an application of the compound scale and corrosion inhibitor in treatment of circulating cooling water. The compound scale and corrosion inhibitor provided by the invention has good scale and corrosion inhibition performance, is applied to the circulating cooling water, can meet the requirements of scale and corrosion inhibition of the circulating cooling water, and also can avoid environmental problems caused by phosphorus-containing drugs in phosphorus-containing circulating cooling water.

Description

technical field [0001] The invention relates to the fields of scale and corrosion inhibition and circulating water treatment, in particular to a 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 scaling and corrosion problems. In order to prevent system scaling and corrosion, the most convenient and effective method is to add corrosion and scale inhibitors to the circulating cooling water. At present, the formulations of corrosion and scale inhibitors commonly used in the treatment of circulating cooling water in China are mostly phosphine-based formulations, and the main agent is phosphonic acid group (-PO 3 h 2 ) Corrosion and scale inhibitors directly connected to carbon atoms, often called organic phosphonic acids. Organic phosphonic acid has good chemical stability, is not easy to hydrolyze, can withstand high temperature, and has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C02F5/12
Inventor 郦和生秦会敏楼琼慧谢文州杨玉李博伟张化冰
Owner CHINA PETROLEUM & CHEM CORP
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