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Phosphorus-free corrosion and scale inhibitor and preparation method thereof

A phosphorus-free corrosion and scale inhibitor technology, applied in chemical instruments and methods, descaling and water softening, complex/solubilizer treatment, etc., can solve the problem of reducing the service life of heat transfer equipment, forming fouling, and affecting normal Production and other issues, to achieve good promotion and application value, mild preparation conditions, and promote the effect of uniform spreading

Pending Publication Date: 2022-01-04
QINGDAO UNIV +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Due to the natural evaporation of water when the water storage tank and cooling tower are cooled, the concentration of salt dissolved in the circulating cooling water will increase, and the concentration of general industrial cooling water is 3-5 times, which makes the salt easily in the cooled equipment. Dirt forms on the heat transfer surface, which greatly reduces the heat transfer rate of the equipment, resulting in changes in the temperature of the production process materials and affecting normal production
Generally, the temperature of the circulating cooling water is exactly the condition that bacteria and algae that can survive in the water attached to the heat transfer surface are easy to breed, and their metabolites are easy to corrode the metal heat transfer surface, and at the same time, the excessively high salt concentration will also corrode the metal. This greatly reduces the service life of heat transfer equipment and increases production costs

Method used

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  • Phosphorus-free corrosion and scale inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 100 parts by mass of maleic anhydride, 190 parts of sorbitol solids, 100 parts of water, and 1 part of concentrated sulfuric acid into the reaction kettle, heat up to 65°C, stir for 2 hours, distill under reduced pressure, and maintain a vacuum of 70kPa to no Moisture steams out and obtains the sorbitol maleate mixture of about 350 parts of quality;

[0035] Take 60 parts by mass of the above mixture and add it to the reaction kettle, add 30 parts of water, 8 parts of zinc chloride, 1 part of polydimethyldiallyl ammonium chloride, 0.5 part of benzotriazole under stirring, Heating to 50°C for 1.5 hours and cooling to obtain a light yellow liquid non-phosphorus corrosion and scale inhibitor. According to the above test method, the scale inhibition rate is 97.8%, the corrosion inhibition rate is 91.6%, and the bactericidal rate is 18%.

Embodiment 2

[0037]Add 100 parts by mass of maleic anhydride, 365 parts of solid sorbitol, 100 parts of water, and 1 part of concentrated sulfuric acid into the reactor, heat up to 80°C, stir and react for 1.5 hours, distill under reduced pressure, and maintain a vacuum of 90kPa to no Moisture steams out and obtains the sorbitol maleate mixture of about 510 parts of quality;

[0038] Take 50 parts of the above-mentioned mixture in parts by mass and add it to the reactor, add 40 parts of water, 2 parts of zinc chloride, 2 parts of polydimethyldiallyl ammonium chloride, 0.5 part of benzotriazole under stirring, Heating to 45°C for 2 hours, cooling to obtain a light yellow liquid non-phosphorus corrosion and scale inhibitor. According to the above test method, the scale inhibition rate is 98.9%, the corrosion inhibition rate is 91.2%, and the bactericidal rate is 24%.

Embodiment 3

[0040] Add 100 parts by mass of maleic anhydride, 272 parts of sorbitol aqueous solution (190 parts of sorbitol), and 5 parts of potassium carbonate into the reaction kettle, heat up to 65°C, stir and react for 1 hour, distill under reduced pressure, and maintain vacuum 70kPa to moisture-free steaming obtains the sorbitol maleate mixture of about 350 parts of quality;

[0041] Take the above-mentioned mixture of 65 parts by mass and put it into the reaction kettle, add 25 parts of water, 6 parts of zinc chloride, 2 parts of polydimethyldiallyl ammonium chloride, 1 part of benzotriazole under stirring, Heating to 55°C to react for 1 hour, cooling to obtain a light yellow liquid non-phosphorus corrosion and scale inhibitor. According to the above test method, the scale inhibition rate is 97.9%, the corrosion inhibition rate is 92.1%, and the bactericidal rate is 28%.

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Abstract

The invention provides a phosphorus-free corrosion and scale inhibitor which is composed of a maleic acid sorbitol ester mixture, zinc chloride, poly dimethyl diallyl ammonium chloride and benzotriazole, the molar ratio of maleic acid sorbitol monoester to maleic acid sorbitol diester to sorbitol in the maleic acid sorbitol ester mixture is in the range of 0.2-0.6: 1: 0.2-0.5, the maleic acid sorbitol monoester, the maleic acid sorbitol diester and the sorbitol form a ring-shaped stable structure through hydrogen bonds, the chelating and dispersing capacity on scaling ions such as calcium and magnesium is greatly improved through mutual cooperation, and a thin film layer can be formed on the surface of metal and has good corrosion inhibition performance on the metal. Zinc chloride and benzotriazole can promote a cyclic structure and metal chelates to more stably form the thin film layer structure, so that the cyclic structure and the metal chelates cooperate with each other to improve the corrosion inhibition performance of the product, and polydimethyldiallylammonium chloride can promote corrosion inhibition and has sterilization and algae removal performance. The raw materials of all the components in the scale inhibitor are easy to obtain, the preparation condition is mild, the synergistic capacity of all the components in scale inhibition is high, and the scale inhibitor has good application and popularization value.

Description

technical field [0001] The invention belongs to the technical field of circulating cooling water, and in particular relates to a phosphorus-free corrosion and scale inhibitor. Background technique [0002] The recycling of industrial cooling water is the most effective technical solution for industrial water conservation, and it is also a typical energy-saving and emission-reduction measure. Due to the natural evaporation of water when the water storage tank and cooling tower are cooled, the concentration of salt dissolved in the circulating cooling water will increase, and the concentration of general industrial cooling water is 3-5 times, which makes the salt easily in the cooled equipment. Dirt forms on the heat transfer surface, which greatly reduces the heat transfer rate of the equipment and causes the temperature change of the production process material to affect the normal production. Generally, the temperature of the circulating cooling water is exactly the condit...

Claims

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Application Information

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IPC IPC(8): C02F5/12C02F5/08C02F5/10
CPCC02F5/125C02F5/105
Inventor 聂兆广邢雅成高鹏黄震马晓梅胡艳芳颜冬云
Owner QINGDAO UNIV
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