Preparation method for degradable slow-release scale inhibitor

A scale inhibitor and slow-release technology, which is applied in the field of preparation of degradable slow-release scale inhibitor, can solve the problems of poor scale inhibition effect, large amount of dosage, scale formation and the like, and achieves low cost, simple preparation steps, and high resistance to scale. good dirt effect

Inactive Publication Date: 2016-03-30
雷春生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to solve the problem that the alkali metal salt of orthophosphoric acid is used as a scale inhibitor, which not only needs to be added in a large amount, but also scales after use, and the scale inhibition effect is poor. A method of adding gelatin and other substances into the scale inhibitor, mixing them, and standing for degassing to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] First, add maleic acid to deionized water at a mass ratio of 1:5, and place it in a four-neck flask, then heat it in a water bath at 80°C until the maleic acid is completely dissolved in deionized water, and then continue to keep warm Heating for 15 minutes, then stop heating and allow it to cool naturally to 25°C to prepare a maleic acid solution; add ammonia solution with a mass concentration of 25% to the maleic acid solution at a mass ratio of 1:2, Then heat up to 90°C, let it stir and react for 5 hours to prepare a transparent glass liquid, then place the glass liquid in a blast drying oven, dry at 180°C for 2 hours, and then dehydrate and cyclize in a vacuum dehumidifier at 230°C 4h, a yellow solid was prepared; then, according to the mass ratio of 1:10, the yellow solid prepared above was added to distilled water, and then heated to 60°C, titrated and hydrolyzed with 0.5mol / L sodium hydroxide solution for 2h, and the solution was After discoloration to reddish-br...

example 2

[0021] First, add maleic acid to deionized water at a mass ratio of 1:5, and place it in a four-neck flask, then heat it in a water bath at 70°C until the maleic acid is completely dissolved in deionized water, and then continue to keep warm Heating for 10 minutes, then stop heating and allow it to cool naturally to 20°C to prepare a maleic acid solution; add ammonia solution with a mass concentration of 25% to the maleic acid solution at a mass ratio of 1:2, Then heat up to 80°C, let it stir and react for 3 hours to prepare a transparent glass liquid, then place the glass liquid in a blast drying oven, dry at 160°C for 1 hour, and then dehydrate and cyclize in a vacuum dehumidifier at 210°C 3h, a yellow solid was prepared; then, according to the mass ratio of 1:10, the yellow solid prepared above was added to distilled water, and then heated to 50°C, titrated and hydrolyzed with 0.5mol / L sodium hydroxide solution for 1h, and the solution was After discoloration to reddish-bro...

example 3

[0023]First, add maleic acid to deionized water at a mass ratio of 1:5, and place it in a four-necked flask, then heat it in a water bath at 75°C until the maleic acid is completely dissolved in deionized water, and then continue to keep warm Heated for 12 minutes, then stopped heating and allowed to cool naturally to 22°C to prepare a maleic acid solution; add ammonia solution with a mass concentration of 25% to the maleic acid solution at a mass ratio of 1:2, Then heat up to 85°C, let it stir and react for 4 hours to prepare a transparent glass liquid, then place the glass liquid in a blast drying oven, dry at 170°C for 1 hour, and then dehydrate and cyclize in a vacuum dehumidifier at 220°C 3h, the yellow solid was prepared; then according to the mass ratio of 1:10, the above-prepared yellow solid was added to distilled water, and then heated to 55°C, then titrated and hydrolyzed with 0.5mol / L sodium hydroxide solution for 1h, and the solution was After discoloration to red...

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PUM

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Abstract

The invention relates to a preparation method for a degradable slow-release scale inhibitor, and belongs to the technical field of scale inhibitor preparation. The preparation method comprises the steps that maleic acid is added into deionized water, after heating in a water bath and cooling are performed, an aqueous ammonia solution is added, heating is performed to increase the temperature, and stirring, drying and cyclodehydration are performed to obtain a yellow solid; the yellow solid is added into distilled water, heating is performed to increase the temperature, and titration and hydrolysis are performed with a sodium hydroxide solution; after the color of the solution is changed into reddish brown, heating is stopped, and natural cooling and standing are performed; filtering is performed, collected filtrate is added into absolute methanol, and precipitation is performed; filtering is performed, filtrate is collected, evaporated and dried, and a granular scale inhibitor is prepared; the granular scale inhibitor is mixed with substances such as a gelatin solution, standing and defoaming are performed, drying is performed, and then the scale inhibitor is prepared. The preparation method has the advantages that when the prepared degradable slow-release scale inhibitor is put into an environment needing scale inhibition, the scale inhibitor is easy to decompose, friendly to the environment and good in scale inhibiting effect, cannot cause water eutrophication and does not need to be massively put due to the slow-release effect of the scale inhibitor.

Description

technical field [0001] The invention relates to a preparation method of a degradable slow-release scale inhibitor, belonging to the technical field of scale inhibitor preparation. Background technique [0002] Scale inhibitor (scale inhibitor): It is 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-changing equipment is formulated with epoxy resin and specific amino resin as the base material, adding appropriate amount of various anti-rust, anti-corrosion and other additives, and 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, flexi...

Claims

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Application Information

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IPC IPC(8): C02F5/08C02F103/42
CPCC02F5/08C02F2103/42
Inventor 雷春生薛红娟高力群
Owner 雷春生
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