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A kind of phosphorus-free scale and corrosion inhibitor and its application method

A phosphorus-free scale and corrosion inhibitor technology, applied in chemical instruments and methods, descaling and water softening, complex/solubilizer treatment, etc. and other problems, to achieve the effect of improving scale and corrosion inhibition efficiency, solubility, and scale and corrosion inhibition performance.

Inactive Publication Date: 2019-08-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the research, it was found that PESA is suitable for high alkalinity and high hardness water quality. Due to the single functional group of PESA, its performance is single, and its ability to inhibit calcium phosphate scale and zinc scale and the stability of metal ions are not outstanding enough. , and compared with phosphorus-containing scale and corrosion inhibitors, it has the disadvantages of large dosage and high cost, which limits its application. The introduction of other polar groups in its molecule can increase its function and reduce the dosage of chemicals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Add 38mL of water to the three-necked flask, then add 18g of flake sodium hydroxide weighed in advance, put the three-necked flask into a magnetic stirring water bath, fully dissolve the sodium hydroxide under magnetic stirring, and raise the temperature of the water bath to 50°C ;After the temperature of the water bath rises to 50°C, add 8g of maleic anhydride, then add 8g of maleic anhydride after half a minute, wait for about 5 minutes, and then raise the temperature of the water bath to 55°C; after the temperature of the water bath rises to 55°C, add 0.9g of sodium tungstate After 5 minutes, the temperature was raised to 65°C; after the water bath was heated to 65°C, add 11g of hydrogen peroxide, wait for 5 minutes, then add 11g of hydrogen peroxide, stir at a constant speed and control the temperature for 2 hours (start timing from the first addition of hydrogen peroxide), after 2 hours Then the water bath is heated to 85°C; after the water bath is heated to 85°C, 0....

Embodiment 2

[0046] Add 36mL of water to the three-necked flask, then add 16g of flake sodium hydroxide weighed in advance, put the three-necked flask into a magnetic stirring water bath, fully dissolve the sodium hydroxide under magnetic stirring, and raise the temperature of the water bath to 55°C ;When the temperature of the water bath rises to 55°C, add 10g of maleic anhydride, then add 10g of maleic anhydride after half a minute, wait for about 5 minutes, and then raise the temperature of the water bath to 60°C; after the temperature of the water bath rises to 60°C, add 1g of sodium tungstate, After 5 minutes, the temperature was raised to 65°C; after the temperature of the water bath was raised to 65°C, add 10g of hydrogen peroxide, wait for 5 minutes, then add 10g of hydrogen peroxide, stir at a constant speed and control the temperature for 2 hours (start timing from the first addition of hydrogen peroxide), after 2 hours The temperature of the water bath is raised to 95°C; after th...

Embodiment 3

[0050] Add 35mL of water to the three-necked flask, then add 14g of flake sodium hydroxide weighed in advance, put the three-necked flask into a magnetic stirring water bath, fully dissolve the sodium hydroxide under magnetic stirring, and at the same time raise the temperature of the water bath to 60°C ;After the temperature of the water bath rises to 60°C, add 12g of maleic anhydride, then add 12g of maleic anhydride after half a minute, wait for about 5 minutes, and then raise the temperature of the water bath to 65°C; after the temperature of the water bath rises to 65°C, add 1.2g of sodium tungstate After 5 minutes, the temperature rises to 70°C; after the water bath heats up to 70°C, add 10g of hydrogen peroxide, wait for 5 minutes, then add 10g of hydrogen peroxide, stir at a constant speed and control the temperature for 2 hours (start timing from the first addition of hydrogen peroxide), after 2 hours Then the water bath is heated to 90°C; after the water bath is heate...

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Abstract

The invention belongs to the field of preparation of scale and corrosion inhibitors for water treatment, and particularly relates to a phosphorus-free scale and corrosion inhibitor and an application method. The scale and corrosion inhibitor is obtained by reacting thiourea-modified activated carbon with polyepoxysuccinic acid through amide, wherein the mass ratio of activated carbon treated by thiourea to polyepoxysuccinic acid ranges from 1:8 to 1:12. The phosphorus-free scale and corrosion inhibitor is used in an industrial circulating cooling water system, has good scale inhibition performance within wide temperature range and system pH range, has a calcium carbonate scale inhibition rate up to 95% or more, can improve industrial water saving rate and reduce emissions, and avoids the secondary pollution caused by a phosphorus-containing corrosion and scale inhibitor to the environment; meanwhile, the invention provides an application method of a novel scale and corrosion inhibitor, to increase an application range of the novel scale and corrosion inhibitor during production.

Description

technical field [0001] The invention belongs to the field of preparation of scale and corrosion inhibitors for water treatment, in particular to the field of preparation and application of a modified polyepoxy succinic acid derivative scale and corrosion inhibitor, which is a kind of scale and corrosion inhibitor for industrial circulating cooling water treatment system The new phosphorus-free, biodegradable, high-efficiency, environment-friendly water treatment agent is used for scale and corrosion inhibition treatment of water quality, and belongs to the technical field of preparation of scale and corrosion inhibitors in the technical field of water treatment. Background technique [0002] Industrial cooling water accounts for 60% to 80% of the total industrial water consumption. Therefore, saving the amount of circulating cooling water, improving water utilization and reducing water discharge are the key links for water conservation. At present, most industrial circulatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/08C02F5/10C02F5/12
Inventor 曾德芳杨运交尚舒陈万通陈子越
Owner WUHAN UNIV OF TECH