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Scale inhibitor for circulating water of boilers

A technology of circulating water and antiscalant, which is applied in the field of antiscalant to achieve the effects of non-toxic and harmless environment, good corrosion inhibition performance and improved comprehensive performance

Inactive Publication Date: 2018-11-23
芜湖市颂晖商贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention proposes a scale inhibitor for boiler circulating water, which solves the environmental problems caused by 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of modified polyaspartic acid, comprising the following steps:

[0024] 1) Configuration of maleic anhydride aqueous solution: dissolve urea with water and add it dropwise to the maleic anhydride aqueous solution, then carry out amination hydrolysis reaction at 108°C, cool to room temperature, then add sodium bisulfate catalyst, in the mixture of sulfuric acid and hydrochloric acid In the mixed acid solvent, react under vacuum conditions at 125°C to obtain polysuccinimide; the volume ratio of the sulfuric acid to the hydrochloric acid in the mixed acid solvent is 1.2:1; the concentration of sulfuric acid is 12mol / L, and the The concentration of hydrochloric acid is 7mol / L

[0025] 2) After the polysuccinimide is taken out and cooled, use dimethyl sulfoxide as a solvent, add ligninsulfonic acid and oxalic acid to react in an oil bath at 105°C for 2 hours, cool, add alkali to adjust the pH to 9, and hydrolyze at 50°C After 40 minutes, add absolute et...

Embodiment 2

[0027] A preparation method of modified polyaspartic acid, comprising the following steps:

[0028] 1) Configuration of maleic anhydride aqueous solution: dissolve urea with water and add it dropwise to the maleic anhydride aqueous solution, then carry out amination hydrolysis reaction at 106°C, cool to room temperature, then add sodium bisulfate catalyst, in the mixture of sulfuric acid and hydrochloric acid Polysuccinimide was obtained by reacting under vacuum conditions at 135°C in a mixed acid solvent; the volume ratio of sulfuric acid and hydrochloric acid in the mixed acid solvent was 1:1; the concentration of sulfuric acid was 10mol / L, and the concentration of hydrochloric acid was 8mol / L.

[0029] 2) After the polysuccinimide is taken out and cooled, use dimethyl sulfoxide as a solvent, add ligninsulfonic acid and oxalic acid to react in an oil bath at 100°C for 2.5h, cool, add alkali to adjust the pH to 8, 40°C Hydrolyze for 50 minutes, add absolute ethanol to wash, ...

Embodiment 3

[0031] A preparation method of modified polyaspartic acid, comprising the following steps:

[0032] 1) Configuration of maleic anhydride aqueous solution: dissolve urea with water and add it dropwise to the maleic anhydride aqueous solution, then carry out amination hydrolysis reaction at 110°C, cool to room temperature, then add sodium bisulfate catalyst, in the mixture of sulfuric acid and hydrochloric acid In the mixed acid solvent, react under 120 ℃ of vacuum conditions to obtain polysuccinimide; the volume ratio of the sulfuric acid and the hydrochloric acid in the mixed acid solvent is 1.5:1; the concentration of sulfuric acid is 15mol / L, and the concentration of hydrochloric acid is 5mol / L.

[0033] 2) After the polysuccinimide is taken out and cooled, use dimethyl sulfoxide as a solvent, add ligninsulfonic acid and oxalic acid to react in an oil bath at 110°C for 1.5h, cool, add alkali to adjust the pH to 10,60°C Hydrolyze for 30 minutes, add absolute ethanol to wash,...

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Abstract

The invention provides a scale inhibitor for circulating water of boilers. The scale inhibitor is prepared from the following raw materials in parts by weight: 20-25 parts of polyepoxysuccinic acid, 12-16 parts of modified polyaspartic acid, 6-10 parts of starch, 10-15 parts of zinc salt, 4-8 parts of mercaptobenzothiazole, 1-3 parts of surfactants and 25-30 parts of water; the modified polyaspartic acid is prepared from lignosulfonic acid and oxalic acid through modification. By the scale inhibitor, environmental problems caused by phosphorus-containing mendicants in existing phosphorus-containing circulating cooling water are solved, and the good scale inhibition effect on calcium carbonate and calcium phosphate is achieved.

Description

technical field [0001] The invention belongs to the technical field of scale inhibitors, in particular to a scale inhibitor for boiler circulating water. Background technique [0002] Scale inhibitors are a class of agents that can disperse insoluble inorganic salts in water, prevent or interfere with the precipitation and scaling of insoluble inorganic salts on metal surfaces, and maintain good heat transfer effects on metal equipment. The anti-corrosion and anti-scaling agent for cold replacement equipment is made of epoxy resin and specific amino resin as the base material, and is formulated by adding appropriate amount of various additives. It is a single component. It has excellent shielding, anti-seepage, anti-rust properties, good scale resistance, thermal conductivity, excellent resistance to weak acids, strong alkalis, organic solvents, etc. It has strong adhesion, and the film layer is bright, flexible, dense, and hard. . [0003] Circulating water plays a pivota...

Claims

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Application Information

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