A kind of scale inhibitor for seawater desalination

A technology of scale inhibitor and aqueous solution, which is applied in the fields of scale removal and water softening, chemical instruments and methods, water/sludge/sewage treatment, etc. Health and ecological environment threats and other issues, to achieve excellent scale inhibition ability, compounding method and operation is simple and easy, and the product quality is good

Active Publication Date: 2016-03-30
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphine-based scale inhibitors have been widely used in seawater desalination processes. This type of scale inhibitor has good performance and stability, but the disadvantage is that phosphine-based scale inhibitors are limited by temperature conditions. In addition, the discharge of phosphorus will cause enrichment in the surrounding waters. Nutritization, promoting the growth of bacteria and algae to form "red tides", long-term persistence in the environment poses a threat to human health and the ecological environment
Directly refer to the chemical type and optimization conditions of industrial circulating water, which cannot achieve good scale inhibition effect in seawater desalination system

Method used

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  • A kind of scale inhibitor for seawater desalination
  • A kind of scale inhibitor for seawater desalination
  • A kind of scale inhibitor for seawater desalination

Examples

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Embodiment 1

[0041] Take 300 grams of aspartic acid and grind it in a mortar, pass it through a 180-mesh sieve, spread it on a medical tray, and then put the tray into an electric blast drying oven for polycondensation reaction, the reaction temperature is 240 ° C, and the reaction is 4 hours. Stir once for 1 hour to obtain 217 grams of yellow-brown polysuccinimide solid; dissolve 11.25 grams of 2-aminoethanesulfonic acid in water and add 15.84 grams of 25% aqueous sodium hydroxide solution dropwise with stirring, and control the reaction temperature to 20-20. 50°C; dissolve 1.33g of aspartic acid in water and add 1.76g of 25% sodium hydroxide aqueous solution dropwise under stirring, and control the reaction temperature at 20-50°C; Add 9.7 grams of polysuccinimide to the flask, then add 30 mL of water to suspend it in water, slowly add 2-aminoethanesulfonate solution and sodium hydrogen aspartate solution dropwise under stirring, and use it every half hour Adjust the pH to 8 with 25% aque...

Embodiment 2

[0046]Take 300 grams of aspartic acid and grind it in a mortar, pass it through a 180-mesh sieve, spread it on a medical tray, and then put the tray into an electric blast drying oven for polycondensation reaction at a reaction temperature of 230°C for 5 hours. Stir once for 1 hour to obtain 217 grams of yellow-brown polysuccinimide solid; dissolve 10 grams of 2-aminoethanesulfonic acid in water and add 15.36 grams of 25% aqueous sodium hydroxide solution dropwise under stirring, and control the reaction temperature to 20-20. 50°C; dissolve 2.66 grams of aspartic acid in water and add 3.84 grams of 25% sodium hydroxide aqueous solution dropwise under stirring, and control the reaction temperature at 20-50°C; Add 9.7 grams of polysuccinimide to the flask, then add 30 mL of water to suspend it in water, slowly add 2-aminoethanesulfonate solution and sodium hydrogen aspartate solution dropwise under stirring, and use it every half hour Adjust the pH to 9 with 25% sodium hydroxide...

Embodiment 3

[0051] Take 300 grams of aspartic acid and grind it in a mortar, pass it through a 180-mesh sieve, spread it on a medical tray, and then put the tray into an electric blast drying oven for polycondensation reaction at a reaction temperature of 250°C for 3.5 hours. Stir once every 1 hour to obtain 217 grams of yellow-brown polysuccinimide solid; dissolve 10 grams of 2-aminoethanesulfonic acid in water and add 16.64 grams of 25% aqueous sodium hydroxide solution dropwise under stirring, and control the reaction temperature to 20 ~50 ℃; Dissolve 2.66 grams of aspartic acid in water and add 4.16 grams of 25% aqueous sodium hydroxide solution dropwise under stirring, and control the reaction temperature to be 20~50 ℃; Add 9.7 grams of polysuccinimide to the flask, then add 30 mL of water to suspend it in water, slowly add 2-aminoethanesulfonate solution and sodium hydrogen aspartate solution dropwise under stirring, every half hour Use 25% sodium hydroxide aqueous solution to adjus...

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Abstract

The invention discloses a high-efficiency environment-friendly scale inhibitor for sea water desalination. The scale inhibitor is prepared by mixing a polyaspartic acid derivative with an itaconic acid homopolymer, wherein the mass percentage of the polyaspartic acid derivative is 50%-65% and the mass percentage of the itaconic acid homopolymer is 35%-50% in effective ingredients of the scale inhibitor. The scale inhibitor is suitable for high-salinity conditions of seawater; when the usage amount of the scale inhibitor is 10mg / L, the static scale inhibiting ratio of the seawater is more than 90% when the seawater is double concentrated.

Description

technical field [0001] The invention relates to an environmentally friendly scale inhibitor used in seawater desalination technology, belonging to the technical field of chemical products. Background technique [0002] Seawater desalination is one of the important and effective ways to solve the problem of lack of freshwater resources. In the process of seawater desalination, due to the presence of Ca in seawater 2＋ , Mg 2＋ , CO 3 2－ , SO 4 2－ 、PO 4 3－ Plasma, as the concentration ratio increases, the pH or temperature increases, the relatively insoluble substances will crystallize and form scale, forming hard scale on the surface of the membrane or the surface of the heat exchange tube, resulting in an increase in system pressure and a decrease in water production. It will also cause damage to the membrane surface, which will greatly reduce the desalination rate or heat exchange efficiency of the system, and may bring potential safety hazards. Severe fouling is ofte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/12
Inventor 高玉华刘振法张利辉李海花闫美芳
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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