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Scale inhibitor

A technology of scale inhibitors and initiators, applied in the field of scale inhibitors, can solve the problems of scale inhibition efficiency, which is only about 50%, difficult to maintain scale inhibition efficiency, etc.

Inactive Publication Date: 2014-12-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing scale inhibitors are usually difficult to maintain a relatively consistent scale inhibition efficiency under different pH conditions. For example, hydrolyzed polymaleic anhydride (HPMA) is a commonly used scale inhibitor monomer, chemical stability and thermal stability High, the decomposition temperature is above 330°C, it has good scale inhibition effect at high temperature (≤350°C) and high pH (8.3), and the scale inhibition time can reach 100 hours. When the pH value is 6-9, HPMA has good The scale inhibition efficiency can reach more than 90%; but when the pH value is greater than 9, the scale inhibition efficiency drops significantly, and when the pH value is 10, the scale inhibition rate is only about 50%.

Method used

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Experimental program
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Effect test

Embodiment 1

[0026] The invention provides a kind of antiscalant, comprises component A and component B mixed with each other, and component A is hydrolyzed polymaleic anhydride (HPMA), and its molecular formula is

[0027]

[0028] Component B is synthesized from three monomers of itaconic acid (IA), 2-acrylamide-2-methylpropylsulfonic acid (AMPS) and 2-acrylamide-2-methylpropylphosphonic acid (AMPP) Copolymer, the molecular formula of described copolymer is

[0029]

[0030] In the molecular formula of the above copolymer, x, y, and z represent itaconic acid (IA), 2-acrylamide-2-methylpropylsulfonic acid (AMPS) and 2-acrylamide-2-methylpropylphosphonic acid respectively (AMPP) molar number, and x: y: z=(50.3-70.6): (11-16): (33-41); The ratio of component A and component B in parts by mass is (4- 6): 1.

[0031] The molar ratio of itaconic acid (IA), 2-acrylamide-2-methylpropylsulfonic acid (AMPS) and 2-acrylamide-2-methylpropylphosphonic acid (AMPP) in component B, It will affe...

Embodiment 2

[0043] Use component A and component B alone, and compare with other typical scale inhibitors to identify their scale inhibition rate, where the molar ratio of IA, AMPS, and AMPP in component B is fixed as x:y:z =60:13.5:39, the mixing ratio of component A and component B is fixed at 5:1. The specific test results are shown in the table below:

[0044] Table 3 Comparison of scale inhibition rate of various scale inhibitors in high alkali environment

[0045]

[0046] Note: Alkalinity is calculated by HCO3-concentration (mg / L), and the same mass is used for various scale inhibitors.

[0047] According to the above table, when component A and component B are used in combination, even if the alkalinity in the sewage is high, a good scale inhibition rate can still be obtained. Experiments have proved that the scale inhibitor of the present invention can be applied to sewage treatment with a pH of 9-11.5.

Embodiment 3

[0049] The present invention also provides a kind of antiscalant preparation method, comprises the following steps:

[0050] 1) Preparation of itaconic acid (IA) aqueous solution: mixing itaconic acid (IA), sodium hypophosphite and distilled water in proportion;

[0051] 2) Copolymerization reaction: Under the condition of nitrogen protection and continuous stirring, add the initiator aqueous solution and the AMPS / AMPP mixed solution dropwise respectively to carry out the copolymerization reaction; the reaction temperature is controlled at 80±1°C, and the dropping time is controlled at about 1h. After the initiator aqueous solution and the AMPS / AMPP mixed solution are added dropwise, continue the heat preservation reaction for 2-4 hours, stop heating, stir, cool and discharge to obtain the component B solution.

[0052] 3) Preparation of component A solution: using maleic anhydride as a raw material and toluene as a solvent, and polymerizing under the trigger of benzoyl peroxi...

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Abstract

The invention relates to a scale inhibitor which has a relatively good corrosion and scale inhibition effect and can effectively treat industrial high-mineral-ion wastewater. The scale inhibitor comprises a component A and a component B which are mixed with each other, wherein the component A is hydrolytic polymaleic anhydride (HPMA); the component B is copolymer synthesized by using itaconic acid (IA), 2-acrylamido-2-methyl propyl sulfonic acid (AMPS) and 2-2-acrylamido-2-methyl propyl phosphonic acid (AMPP); in a molecular formula of the copolymer, x, y and z represent mole numbers of IA, AMPS and AMPP respectively, and the ratio of x to y to z is (50.3-70.6) to (11-16) to (33-41); the mass part ratio of the component A to the component B is (4-6) to 1.

Description

technical field [0001] The invention relates to a scale inhibitor, in particular to a scale inhibitor for industrial waste water with high mineral ion content. Background technique [0002] Industrial wastewater, especially wastewater from heavy metal processing industries such as mines, contains a large amount of dissolved minerals; taking calcium ions as an example, the concentration of circulating cooling water, the continuous dissolution of calcium in mineral ash, etc., make the calcium ion Ca in the water 2+ Constantly increasing concentrations and pH values, sometimes exceeding 11, OH - The increase makes the HCO in the water 3 - to CO 3 2- Transformation, Ca 2+ with CO 3 2- CaCO 3 Crystals, deposited on pipes, pumps and pool walls, forming hard scales. In addition to calcium ions, metal ions such as magnesium ions and iron ions are common, and heavy metal ions such as barium ions are common. [0003] However, the existing scale inhibitors are usually difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10
Inventor 陈腾殊曾德芳
Owner WUHAN UNIV OF TECH
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