Scale inhibitor used for inhibiting formation of calcium sulfate scale and preparation method thereof

A technology of calcium sulfate scale and scale inhibitor, used in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc.

Inactive Publication Date: 2014-09-10
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on polycitric acid and its derivatives as

Method used

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  • Scale inhibitor used for inhibiting formation of calcium sulfate scale and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A scale inhibitor used to inhibit the formation of calcium sulfate scale, that is, polycitric acid obtained through condensation polymerization reaction using citric acid as raw material.

[0040] The above-mentioned preparation method for suppressing the scale inhibitor that calcium sulfate scale forms, specifically comprises the steps:

[0041] (1) Add 20 mL of solvent and 4.0 g of citric acid into the reactor, stir and mix evenly to obtain a solution;

[0042] Described solvent is tetrahydrofuran, and its consumption is calculated as 200g / L by the concentration of the citric acid finally formed;

[0043] (2) Control the dropping rate to 0.05mL / min, add 2.2mL catalyst to the solution obtained in step (1), stir and mix evenly, then heat to reflux state to carry out condensation polymerization for 4h;

[0044] Described catalyzer is concentrated sulfuric acid, and its consumption is calculated by mass ratio, namely catalyzer: citric acid is 1:1;

[0045] (3), adjust t...

Embodiment 2

[0048] A scale inhibitor used to inhibit the formation of calcium sulfate scale, that is, polycitric acid obtained through condensation polymerization reaction using citric acid as raw material.

[0049] The above-mentioned antiscalant for suppressing the formation of calcium sulfate scale, i.e. the preparation method of polycitric acid, specifically comprises the steps:

[0050] (1) Add 90mL of solvent and 1.8g of citric acid into the reactor, stir and mix evenly to obtain a solution;

[0051] Described solvent is tetrahydrofuran, and its consumption is calculated as 20g / L by the concentration of the citric acid finally formed;

[0052] (2) Control the dropping rate to 0.5mL / min, add 3.9mL of catalyst to the solution obtained in step (1), stir and mix evenly, then heat to reflux state to carry out condensation polymerization reaction for 24h to obtain the reaction solution;

[0053] Described catalyzer is the concentrated sulfuric acid, and its consumption is calculated by m...

Embodiment 3

[0057] A scale inhibitor used to inhibit the formation of calcium sulfate scale, that is, polycitric acid obtained through condensation polymerization reaction using citric acid as raw material.

[0058] The above-mentioned antiscalant for suppressing the formation of calcium sulfate scale, i.e. the preparation method of polycitric acid, specifically comprises the steps:

[0059] (1) Add 40 mL of solvent and 4.0 g of citric acid into the reactor, stir and mix evenly to obtain a solution;

[0060] Described solvent is tetrahydrofuran, and its consumption is calculated as 100g / L by the concentration of the citric acid finally formed;

[0061] (2) Add 4.5mL catalyst to the solution obtained in step (1) by controlling the dropping rate to 0.25mL / min, stir and mix evenly, then heat to reflux state to carry out condensation polymerization for 12 hours to obtain a reaction solution;

[0062] Described catalyzer is the concentrated sulfuric acid, and its consumption is calculated by ...

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Abstract

The invention discloses a scale inhibitor used for inhibiting formation of calcium sulfate scale and a preparation method thereof. The scale inhibitor used for inhibiting formation of calcium sulfate scale is poly(citric acid), poly(citric acid-glycol) ester, poly(citric acid-propylene glycol) ester, poly(citric acid-glycerol) ester or poly(citric acid-triethanolamine) ester prepared by subjecting a raw material selected from the group consisting of citric acid, a mixture of citric acid and glycol, a mixture of citric acid and propylene glycol, a mixture of citric acid and glycerol and a mixture of citric acid and triethanolamine to condensation polymerization. The scale inhibitor is used as a scale inhibitor for calcium sulfate scale in a water system containing calcium ions and sulfate ions, and when the application amount of the scale inhibitor is 15 g/mL, the scale inhibition rate of the scale inhibitor reaches 94.5 to 97.5%; and the scale inhibitor has the characteristics of environment-friendliness, no pollution, etc.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment, and in particular relates to a scale inhibitor for inhibiting the formation of calcium sulfate scale and a preparation method thereof. Background technique [0002] In industrial water treatment, the scaling problem has received extensive attention. The low thermal conductivity of scale directly increases the energy consumption of production and reduces economic benefits; in addition, scale can also cause problems such as equipment corrosion, which will greatly endanger the safe operation of equipment. At present, various industrial raw water often contains Ca2+, SO42- plasma, which will continue to accumulate and form slightly water-soluble CaSO4 even after treatment, which will deposit on the surface of equipment or pipelines and become hard scale, which will significantly reduce the working efficiency of equipment , and even endanger production safety. [0003] The use of ...

Claims

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Application Information

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IPC IPC(8): C02F5/10C02F5/12
Inventor 赵玉增刘快迎葛红花付丽君
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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