Phosphorus-free corrosion and scale inhibitor and preparation method thereof

A technology of phosphorus-free corrosion and scale inhibitors, applied in chemical instruments and methods, descaling and water softening, special treatment targets, etc., can solve problems such as poor corrosion and scale inhibition effects, and achieve improved corrosion inhibition performance and cost-effectiveness The effect of fast film speed and increased dispersion

Inactive Publication Date: 2020-02-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The non-phosphorus corrosion and scale inhibitors provided by related technologies have poor corrosion and scale inhibition effects in water quality less than 150 mg / L (calculated as calcium carbonate)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0058] On the other hand, the embodiments of the present invention also provide a method for preparing any of the above-mentioned non-phosphorus corrosion and scale inhibitors, the method comprising:

[0059] According to the parts by weight of each component, polyepoxysuccinic acid aqueous solution, citric acid and / or citrate are added into the reactor, and the first stirring is performed to dissolve the citric acid and / or citrate.

[0060] Add deionized water into the reactor, and add benzotriazole while stirring to dissolve the benzotriazole.

[0061] Add imidazoline amide acetate and maleic acid-acrylic acid-styrenesulfonic acid terpolymer into the reactor while stirring, and mix well.

[0062] Add zinc salt into the reactor, perform second stirring, and dissolve to obtain the non-phosphorus corrosion and scale inhibitor.

[0063] The above-mentioned preparation method is simple, and the non-phosphorus corrosion and scale inhibitor can be prepared on site, and the prepare...

Embodiment 1

[0071] This embodiment provides a phosphorus-free corrosion and scale inhibitor, which is prepared by the following method: add 30 kilograms of polyepoxysuccinic acid aqueous solution (the mass percentage of polyepoxysuccinic acid is 50% ), 5 kilograms of citric acid, stirred for 10 min to dissolve the citric acid completely. Then add 45 kilograms of deionized water in the reactor, slowly add 2 kilograms of benzotriazole while stirring, the time of adding while stirring is 5min, makes benzotriazole dissolve. Then add 3 kilograms of imidazoline amide acetate and 5 kilograms of maleic acid-acrylic acid-styrenesulfonic acid terpolymer to the reactor while stirring, and the time of adding while stirring is 5 minutes to dissolve the sodium molybdate. Finally, 10 kg of zinc sulfate heptahydrate was added to the reaction kettle, and stirred for 15 minutes to dissolve the zinc sulfate heptahydrate to obtain a relatively transparent phosphorus-free corrosion and scale inhibitor provide...

Embodiment 2

[0073] This embodiment provides a phosphorus-free corrosion and scale inhibitor, which is prepared by the following method: add 20 kilograms of polyepoxysuccinic acid aqueous solution (the mass percentage of polyepoxysuccinic acid is 50% ), 8 kilograms of citric acid, stirred for 15 min to dissolve the citric acid completely. Then add 45 kilograms of deionized water in the reaction kettle, slowly add 3 kilograms of benzotriazole while stirring, the time of adding while stirring is 5min, makes benzotriazole dissolve. Then, 4 kg of imidazoline amide acetate and 5 kg of maleic acid-acrylic acid-styrenesulfonic acid terpolymer were added to the reactor while stirring, and the time of adding while stirring was 5 minutes. Finally, 15 kg of zinc sulfate heptahydrate was added to the reaction kettle, and stirred for 15 minutes to dissolve the zinc sulfate heptahydrate to obtain a relatively transparent phosphorus-free corrosion and scale inhibitor provided in this embodiment.

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Abstract

The invention discloses a phosphorus-free corrosion and scale inhibitor and a preparation method thereof, and belongs to the technical field of water treatment. The phosphorus-free corrosion and scaleinhibitor is prepared by mixing and complexing the components in parts by weight: 10-30 parts of a polyepoxysuccinic acid aqueous solution, 4-8 parts of citric acid and / or a citrate, 1-3 parts of 1H-benzotriazole, 5-15 parts of a zinc salt, 3-6 parts of imidazolinamide acetate, 5-10 parts of a maleic acid-acrylic acid-styrene sulfonic acid terpolymer and the balance deionized water. The phosphorus-free corrosion and scale inhibitor can be applied to water bodies with lower hardness, and the effect of corrosion and scale inhibition in water with water hardness as low as 150 mg / L (calculated based on calcium carbonate) is good.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a phosphorus-free corrosion and scale inhibitor and a preparation method thereof. Background technique [0002] During the use of industrial circulating cooling water, problems such as corrosion and scaling will inevitably occur. Adding corrosion and scale inhibitors is a relatively economical and feasible measure at present. Phosphorus-based corrosion and scale inhibitors are widely used because of their high efficiency and economical advantages. However, the phosphorus element in phosphorus-based corrosion and scale inhibitors will cause eutrophication of water quality and cause harm to the environment. Based on the above, it is very necessary to provide a phosphorus-free corrosion and scale inhibitor that will not cause eutrophication of water quality. [0003] The related technology provides a non-phosphorus corrosion and scale inhibitor, which includes the following...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C02F5/12C23F11/08
CPCC02F5/105C02F5/125C02F2303/08C23F11/08
Inventor 黄刚华陈文谷坛毛汀王月江晶晶张强吴贵阳黄丽华
Owner PETROCHINA CO LTD
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