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Scale inhibitor for inhibiting formation of calcium carbonate scales and calcium sulfate scales and preparation method

A technology of calcium carbonate scale and calcium sulfate scale, which can be used in chemical instruments and methods, scale removal and water softening, water/sludge/sewage treatment, etc., and can solve the problems of poor scale inhibition performance of calcium scale.

Inactive Publication Date: 2019-07-19
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ethylenediaminetetraacetic acid has poor scale inhibition performance on calcium scale in water, and new scale inhibitors can be developed through polymerization modification

Method used

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  • Scale inhibitor for inhibiting formation of calcium carbonate scales and calcium sulfate scales and preparation method
  • Scale inhibitor for inhibiting formation of calcium carbonate scales and calcium sulfate scales and preparation method
  • Scale inhibitor for inhibiting formation of calcium carbonate scales and calcium sulfate scales and preparation method

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Embodiment 1

[0047]A scale inhibitor used to inhibit the formation of calcium sulfate scale and calcium carbonate scale, that is, ethylenediaminetetraacetic acid and diethanolamine are used as raw materials, dispersed in N,N-dimethylformamide, and phosphoric acid is used as a catalyst. Condensation polymerization reaction, obtained ethylenediaminetetraacetic acid diethanolamine polymer, the high molecular polymer can be used to inhibit the formation of calcium sulfate scale and calcium carbonate scale, as a scale inhibitor.

[0048] The preparation method of above-mentioned scale inhibitor comprises the steps:

[0049] (1) Add 2.92g of ethylenediaminetetraacetic acid and 1mL of diethanolamine into a three-necked round-bottomed flask, and add 10mL of solvent, which is N,N-dimethylformamide;

[0050] (2) Add the catalyst of 5mL in the reagent of step (1) gained, carry out condensation polymerization reaction 1h at temperature 180 DEG C; Described catalyst is phosphoric acid;

[0051] (3) Af...

Embodiment 2

[0055] A scale inhibitor used to inhibit the formation of calcium sulfate scale and calcium carbonate scale, that is, the ethylenediaminetetraacetic acid diethanolamine polymer obtained through condensation polymerization reaction using ethylenediaminetetraacetic acid and diethanolamine as raw materials, that is, scale inhibitor agent.

[0056] The preparation method of above-mentioned scale inhibitor comprises the steps:

[0057] (1) Add 2.92g of ethylenediaminetetraacetic acid and 1mL of diethanolamine into a three-necked round-bottomed flask, and add 10mL of solvent, which is N,N-dimethylformamide;

[0058] (2) Add the catalyst of 5mL in the reagent of step (1) gained, carry out condensation polymerization reaction 2h at temperature 200 DEG C; Described catalyst is phosphoric acid;

[0059] (3) After the reaction of step (2) finishes, the resulting reaction solution is adjusted to be nearly neutral with sodium hydroxide solution, and the pH value of the solution is between...

Embodiment 3

[0063] A scale inhibitor used to inhibit the formation of calcium sulfate scale and calcium carbonate scale, that is, the ethylenediaminetetraacetic acid diethanolamine polymer obtained through condensation polymerization reaction using ethylenediaminetetraacetic acid and diethanolamine as raw materials, that is, scale inhibitor agent.

[0064] The preparation method of above-mentioned scale inhibitor comprises the steps:

[0065] (1) Add 2.92g of ethylenediaminetetraacetic acid and 1mL of diethanolamine into a three-necked round-bottomed flask, and add 10mL of solvent, which is N,N-dimethylformamide;

[0066] (2) Add the catalyst of 5mL in the reagent of step (1) gained, carry out condensation polymerization reaction 1h at temperature 220 ℃; Described catalyst is phosphoric acid;

[0067] (3) After the reaction finishes, the resulting reaction solution is adjusted to be nearly neutral with sodium hydroxide solution, and the pH value of the solution is between 6-8. After coo...

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Abstract

The invention discloses a scale inhibitor for inhibiting the formation of calcium sulfate scales and calcium carbonate scales and a preparation method of the scale inhibitor. The scale inhibitor is anethylenediamine tetraacetic acid-diethanol amine polymer obtained by dispersing ethylenediamine tetraacetic acid and diethanol amine serving as raw materials in N,N-dimethylformamide and taking phosphoric acid as a catalyst through a condensation polymerization reaction. The preparation method comprises the following steps: adding a dispersing agent into a mixture of ethylenediamine tetraacetic acid and diethanol amine serving as monomers to obtain a reaction solution; adding a catalyst into the reaction solution, uniformly stirring and mixing, and heating to carry out a condensation polymerization reaction; and after the reaction is finished, adjusting the pH value, cooling to room temperature, dialyzing the reaction solution by using a dialysis membrane, evaporating the dialyzed solution to remove the solvent to obtain a crude product, and drying to obtain the scale inhibitor. The scale inhibitor can be used for inhibiting formation of calcium sulfate scales and calcium carbonate scales in an industrial water system containing calcium ions, sulfate ions and carbonate ions, and the scale inhibition rate can reach 95% or above.

Description

technical field [0001] The invention relates to a scale inhibitor for inhibiting the formation of calcium carbonate scale and calcium sulfate scale and a preparation method thereof, belonging to the technical field of industrial water treatment. Background technique [0002] With the increase of industrial water consumption, calcium ions and magnesium ions in the water will combine with sulfate ions and carbonate ions to form scale and deposit on the surface of industrial equipment or pipelines, which not only reduces economic benefits, but also causes corrosion problems , which will reduce the working efficiency of the equipment and even endanger production safety. [0003] The use of scale inhibitors can effectively reduce scaling. Scale inhibitors can not only effectively inhibit the precipitation of scale-forming ions in water, but also disperse the formed scale in water to prevent the formation of hard scale on the surface of equipment. Antiscalants can be divided int...

Claims

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Application Information

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IPC IPC(8): C02F5/12
CPCC02F5/12
Inventor 赵玉增陈剑秋朱娟娟刘挺然葛红花
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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