Preparation and application methods of modified polyepoxysuccinic acid scale and corrosion inhibitor

A technology of polyepoxysuccinic acid, scale and corrosion inhibitor, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., to achieve good biodegradability and water solubility, non-toxicity Destroy the ecological environment and increase the effect of scale and corrosion inhibition performance

Inactive Publication Date: 2012-03-28
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The purpose of the present invention is to solve the problems of high cost, low scale inhibition efficiency and harmful to the environment of existing scale inhibitors. One is to provide a water-soluble Good, non-toxic and harmless to the environment, biodegradable, high scale inhibition efficiency, low production cost modified polyepoxysuccinic acid scale and corrosion inhibitor synthesis method, the second is to provide a modified polyepoxysuccinic acid inhibitor The application method of scale corrosion inhibitor increases its application range

Method used

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  • Preparation and application methods of modified polyepoxysuccinic acid scale and corrosion inhibitor
  • Preparation and application methods of modified polyepoxysuccinic acid scale and corrosion inhibitor
  • Preparation and application methods of modified polyepoxysuccinic acid scale and corrosion inhibitor

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A. Cyclization reaction and purification of cyclization products

[0026] aAdd 16g of NaOH and 36ml of water solvent solution into the three-necked flask, put the three-necked flask into a magnetic stirring water bath, fully dissolve under magnetic stirring, add 19.6g of maleic anhydride, and raise the temperature of the water bath to 55°C. After the water bath was heated to 55°C, the catalyst 1.2gNa was added 2 WO 4 . Finally, raise the temperature of the water bath to 70°C. After the temperature stabilizes, use a separatory funnel to evenly add 24ml of hydrogen peroxide dropwise within 35 minutes. At this point, 1:1 hydrochloric acid solution was used to adjust the pH to 6-7, and the mixed crude product was obtained after 1.5 hours of reaction.

[0027] b product purification: the mixed crude product of step a is heated with an electric heating mantle, and vacuumized simultaneously for distillation under reduced pressure. When the remaining liquid after evaporatio...

Embodiment 2

[0033] A. Cyclization reaction and purification of cyclization products

[0034] aAdd 13g of NaOH and 35ml of water solvent solution into the three-necked flask, put the three-necked flask into a magnetic stirring water bath, fully dissolve under magnetic stirring, add 18g of maleic anhydride, and simultaneously raise the temperature of the water bath to 52°C. After the temperature of the water bath was raised to 52°C, the catalyst 1gNa was added 2 WO 4 . Finally, raise the temperature of the water bath to 65°C. After the temperature is stable, use a separatory funnel to evenly add 20ml of hydrogen peroxide dropwise within 30 minutes. At this time, start to adjust the pH=6-7 with 1:1 hydrochloric acid solution, and get mixed crude product after reacting for 1 hour.

[0035] b product purification: the mixed crude product of step a is heated with an electric heating mantle, and vacuumized simultaneously for distillation under reduced pressure. When the remaining liquid afte...

Embodiment 3

[0041] A. Cyclization reaction and purification of cyclization products

[0042] a Add 18g of NaOH and 38ml of water solvent solution to the three-necked flask, put the three-necked flask into a magnetic stirring water bath, fully dissolve under magnetic stirring, add 20g of maleic anhydride, and simultaneously raise the temperature of the water bath to 58°C. After the temperature of the water bath was raised to 58°C, the catalyst 1.5gNa was added 2 WO 4 Finally, raise the temperature of the water bath to 75°C, and after the temperature stabilizes, use a separatory funnel to evenly add 26ml of hydrogen peroxide dropwise within 40 minutes. At this point, a 1:1 hydrochloric acid solution was used to adjust the pH to 7, and the mixed crude product was obtained after 2 hours of reaction.

[0043] b product purification: the mixed crude product of step a is heated with an electric heating mantle, and vacuumized simultaneously for distillation under reduced pressure. When the rem...

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Abstract

The invention relates to the fields of preparation and application of a modified polyepoxysuccinic acid scale and corrosion inhibitor, and particularly relates to preparation and application methods of a modified polyepoxysuccinic acid scale and corrosion inhibitor which has good biodegradability and water solubility and can be used in water treatment agents. The preparation method comprises the following steps: cyclization reaction and purification of a cyclization product; preparation of a polyepoxysuccinic acid product; and preparation of modified polyepoxysuccinic acid. The modified polyepoxysuccinic acid scale and corrosion inhibitor can be applied under the conditions that temperature is 60-90 DEG C, pH value is 6.0-9.0 and scale inhibition rate is 90-95%. The preparation and application methods have the advantages that: the original complexing capability of polyepoxysuccinic acid is improved, and thus the purpose of improving scale and corrosion inhibition efficiency is finallyachieved; and other process conditions are not changed, and only a low-molecular-weight substance is added in synthesis, thus the purpose of increasing scale and corrosion inhibition performance of polyepoxysuccinic acid is achieved.

Description

technical field [0001] The invention relates to the preparation and application field of a modified polyepoxysuccinic acid scale and corrosion inhibitor. In particular, it relates to the preparation and application method of a modified polyepoxysuccinic acid scale and corrosion inhibitor with good biodegradability and water solubility used in water treatment agents. Background technique [0002] Although the industrial circulating cooling water system can save a lot of water resources, due to the influence of factors such as air pollution, water temperature rise, concentration multiple increase, process medium leakage and other factors during operation, the content of bacteria and dissolved oxygen increases greatly, resulting in circulating cooling. Severe fouling and corrosive bacteria appear in the water, which greatly reduces the heat exchange efficiency of the system, frequent maintenance, and even seriously threatens the normal production. With the increasing awarene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12
Inventor 柳鑫华孙彩云韩婕王庆辉孔毅超杜娇庞宁波
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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