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Composite scale and corrosion inhibitor and application of composite scale and corrosion inhibitor in circulating cooling water treatment

A technology of scale and corrosion inhibitor and cyclodextrin, which is applied in the field of compound scale and corrosion inhibitor and its application in the treatment of circulating cooling water, can solve the problems that phosphorus-containing chemicals and copolymers are difficult to degrade, and meet the requirements of resistance Requirements for scale and corrosion inhibition, avoidance of environmental problems, effects of good scale and corrosion inhibition performance

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 difficult degradation of phosphorus-containing chemicals and copolymers in existing phosphorus-containing circulating cooling water

Method used

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  • Composite scale and corrosion inhibitor and application of composite scale and corrosion inhibitor in circulating cooling water treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 6.0g α-cyclodextrin, 10.0g carboxymethyl lignin (purchased from Tianjin Huixinde Chemical Products Sales Co., Ltd.) and 18.0g polyepoxysuccinic acid (limiting viscosity at 30°C is 0.078dl / g ), add 66.0g of water, and shake well to obtain the composite scale and corrosion inhibitor stock solution S1.

[0043] 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 α-cyclodextrin, carboxymethyl lignin and polyepoxysuccinic acid in the water are 6mg / L and 10mg respectively / L and 9mg / L, and then measure the calcium carbonate scale inhibition performance and corrosion inhibition performance according to the method in the test example.

Embodiment 2

[0045] Weigh 3.14g of zinc chloride, dissolve it in 9.0g of polyaspartic acid (limited viscosity at 30°C is 0.074dl / g), then add 3.0g of methyl-substituted β-cyclodextrin and 18.0g of carboxymethyl Base cellulose (purchased from Jinye Industrial Co., Ltd., Renqiu City, Hebei Province), and then add 46.86g of water, and shake well to obtain the composite scale and corrosion inhibitor stock solution S2.

[0046] 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 methyl-substituted β-cyclodextrin, carboxymethylcellulose, polyaspartic acid The effective concentrations of zinc ions and zinc ions were 3mg / L, 18mg / L, 4.5mg / L and 1.5mg / L respectively, and then the calcium carbonate scale inhibition performance was measured according to the method in the test example.

[0047] Use sulfuric acid to adjust the pH value of the test water 2 to 7.8-8.3, then add the compound scale and corrosio...

Embodiment 3

[0049] Separately add 0.16g of γ-cyclodextrin, 60.0mg of sodium lignosulfonate (purchased from Jinan Liangfeng Trading Co., Ltd.), 0.12g of polyaspartic acid (limiting viscosity at 30°C is 0.079dl / g) and 10.0mg of benzotriazole were added to 10L of test water 1, so that the effective concentrations of γ-cyclodextrin, sodium lignosulfonate, polyaspartic acid and benzotriazole in the water were 16mg / L and 6mg respectively / 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 field of scale and corrosion inhibition and circulating water treatment and discloses a composite scale and corrosion inhibitor. The composite scale and corrosion inhibitor comprises cyclodextrin and / or a cyclodextrin derivative, a plant natural high-molecular compound and a derivative thereof and polyaspartic acid and / or polyepoxysuccinic acid. In the composite scale and corrosion inhibitor, the weight ratio of cyclodextrin and / or the cyclodextrin derivative to the plant natural high-molecular compound and a derivative thereof to polyaspartic acid and / or polyepoxysuccinic acid is (2-20): (2-25): (5-25). The invention discloses application of the composite scale and corrosion inhibitor in circulating cooling water treatment. The composite scale and corrosion inhibitor has good scale and corrosion inhibition property, is applied to circulating cooling water, can meet requirements of circulating cooling water on scale and corrosion inhibition, and also can avoid the environmental problem caused by the case that phosphorus-containing medicaments and copolymers in existing phosphorus-containing circulating cooling water are hard to degrade.

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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IPC IPC(8): C02F5/10C02F5/12
Inventor 秦会敏郦和生楼琼慧李博伟谢文州杨玉张化冰
Owner CHINA PETROLEUM & CHEM CORP
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