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Scale inhibitor for industrial circulating cooling water

A technology of circulating cooling water and scale inhibition, which is applied in the field of scale inhibitors to achieve the effects of strong alkali resistance, high efficiency of scale inhibition and high efficiency of scale inhibition.

Inactive Publication Date: 2018-10-26
芜湖市颂晖商贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a scale inhibitor for industrial circulating cooling water. The scale inhibitor solves the environmental problems caused by the phosphorus-containing chemicals in the existing phosphorus-containing circulating cooling water, and has good scale inhibition performance on both calcium carbonate and calcium phosphate.

Method used

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  • Scale inhibitor for industrial circulating cooling water
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Embodiment 1

[0022] A preparation method of modified polyaspartic acid, comprising the following steps:

[0023] 1) Configuration of maleic anhydride aqueous solution: after dissolving urea in water, add dropwise to the aqueous solution of maleic anhydride, then carry out amination hydrolysis reaction at 108 ° C, cool to room temperature, then add sodium hydrogen sulfate catalyst, in the mixture of sulfuric acid and hydrochloric acid. In the mixed acid solvent, the polysuccinimide is obtained by reacting under vacuum conditions at 125 °C; the volume ratio of the sulfuric acid to the hydrochloric acid in the mixed acid solvent is 1.2:1; the concentration of the sulfuric acid is 12 mol / L, and the The concentration of hydrochloric acid is 7mol / L

[0024] 2) After the polysuccinimide was taken out and cooled, dimethyl sulfoxide was used as solvent, lignin sulfonic acid and oxalic acid were added to react in an oil bath at 105°C for 2 hours, cooled, and alkali was added to adjust the pH to 9, a...

Embodiment 2

[0026] A preparation method of modified polyaspartic acid, comprising the following steps:

[0027] 1) Configuration of maleic anhydride aqueous solution: after dissolving urea in water, add dropwise to the aqueous solution of maleic anhydride, then carry out amination hydrolysis reaction at 106 ° C, cool to room temperature, then add sodium hydrogen sulfate catalyst, in the mixture of sulfuric acid and hydrochloric acid. In the mixed acid solvent, the polysuccinimide is obtained by reacting under 135 ℃ of vacuum conditions; the volume ratio of the sulfuric acid and the hydrochloric acid in the mixed acid solvent is 1:1; the concentration of the sulfuric acid is 10 mol / L, and the concentration of the hydrochloric acid is 8mol / L.

[0028] 2) After taking out the polysuccinimide for cooling, using dimethyl sulfoxide as solvent, adding lignosulfonic acid and oxalic acid in an oil bath at 100°C for 2.5 hours, cooling, and adding alkali to adjust pH to 8, 40°C Hydrolyzed for 50 mi...

Embodiment 3

[0030] A preparation method of modified polyaspartic acid, comprising the following steps:

[0031] 1) Configuration of maleic anhydride aqueous solution: after dissolving urea in water, add dropwise to the aqueous solution of maleic anhydride, then carry out amination hydrolysis reaction at 110 ° C, cool to room temperature, then add sodium hydrogen sulfate catalyst, in the mixture of sulfuric acid and hydrochloric acid. In the mixed acid solvent, the polysuccinimide is obtained by reacting under 120 ℃ of vacuum conditions; the volume ratio of the sulfuric acid and the hydrochloric acid in the mixed acid solvent is 1.5:1; the concentration of the sulfuric acid is 15 mol / L, and the concentration of the hydrochloric acid is 5mol / L.

[0032] 2) After taking out the polysuccinimide for cooling, using dimethyl sulfoxide as solvent, adding lignin sulfonic acid and oxalic acid in an oil bath at 110 °C for 1.5 hours, cooling, and adding alkali to adjust the pH to 10,60 °C Hydrolyzed...

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Abstract

The invention provides a scale inhibitor for industrial circulating cooling water. The scale inhibitor is prepared from the following raw materials in parts by weight: 20 to 25 parts of polyepoxysuccinic acid, 12 to 16 parts of modified polyaspartic acid, 6 to 10 parts of acrylic-2-acryloylamino-2-methylpropionic acid copolymer, 10 to 15 parts of sodium gluconate, 3 to 6 parts of benzotriazole, 1to 3 parts of surfactant and 25 to 30 parts of water, wherein the modified polyaspartic acid is mainly prepared from lignosulfonic acid and oxalic acid by modification. The scale inhibitor solves theenvironmental problems caused by phosphorus-containing agents in existing phosphorus-containing circulating cooling water, and has very high scale inhibition performance for calcium carbonate and calcium phosphate.

Description

technical field [0001] The invention belongs to the technical field of scale inhibitors, in particular to a scale inhibitor for industrial circulating cooling water. Background technique [0002] In the past, the industrial cooling water used a once-through cooling water system, which not only requires a large amount of water, but also makes it difficult to control the water quality and discharges a large amount of sewage. At present, most countries have changed industrial once-through cooling water to circulating cooling water, thus saving water to a certain extent, reducing sewage and preventing pollution. In the open circulating cooling water system, the cooling water heats up after heat exchange, then cools down by evaporation in the cooling tower, and returns to the system for recycling. Increasing the concentration ratio can effectively reduce the amount of water replenishment and sewage. However, with the increase of the concentration ratio, the scale ion concentrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C02F5/12C08G73/12
CPCC02F5/10C02F5/12C02F2303/08C08G73/12
Inventor 汪泽维汪鹏
Owner 芜湖市颂晖商贸有限公司
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