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Itaconic acid-aspartic acid copolymerized phosphorus-free scale inhibitor and preparation method thereof

A phosphorus-free scale inhibitor, aspartic acid technology, applied in chemical instruments and methods, descaling and water softening, semi-permeable membrane separation, etc., can solve water eutrophication, environmental pollution, phosphorus-containing scale inhibitors Easy to hydrolyze and other problems, achieve the effect of no impact on the environment, reduce production costs, synthesis costs and post-processing costs

Active Publication Date: 2017-10-10
南通联膦化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, phosphorus-containing scale inhibitors are easily hydrolyzed, causing eutrophication of water bodies, and causing a certain degree of environmental pollution.

Method used

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  • Itaconic acid-aspartic acid copolymerized phosphorus-free scale inhibitor and preparation method thereof
  • Itaconic acid-aspartic acid copolymerized phosphorus-free scale inhibitor and preparation method thereof
  • Itaconic acid-aspartic acid copolymerized phosphorus-free scale inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, itaconic acid-aspartic acid copolymer is synthesized according to the following steps, and itaconic acid and aspartic acid monomers are added into a three-necked flask as raw materials, and the amount of itaconic acid and aspartic acid The ratio is 1:1 or 3:2 or 4:1, the solvent is deionized water, and the mass ratio of deionized water to reactant monomer is 2.3. Put the flask into a constant temperature water bath adjusted to 75°C or 85°C or 95°C for heating, turn on the stirrer and stir to dissolve itaconic acid and aspartic acid, and oxidize it with 40% (mass fraction) of hydrogen The sodium solution is neutralized to a pH of 8-9. Use a constant-pressure dropping funnel to add the initiator ammonium persulfate at a constant speed, the quality of ammonium persulfate is 7% or 9% or 11% of the total mass of itaconic acid and aspartic acid, nitrogen protection, heating to reflux and mechanical stirring, drop The adding time is 0.5h. After the dropwis...

Embodiment 2

[0033] Embodiment 2 Add itaconic acid and aspartic acid monomers as raw materials in a three-necked flask, and get the raw materials according to the ratio of the amount of itaconic acid and aspartic acid listed in Table 2, and the solvent is deionized water , the mass ratio of deionized water to the reactant monomer is 2.3, put the flask into a constant temperature water bath adjusted to 85°C for heating, turn on the stirrer for stirring, and dissolve itaconic acid and aspartic acid, and use 40% (mass fraction) sodium hydroxide solution to neutralize to pH 8-9. Use a constant pressure dropping funnel to add the initiator ammonium persulfate at a constant speed. The mass of ammonium persulfate is 9% of the total mass of the monomer. Under nitrogen protection, heat to reflux and stir mechanically. The dropping time is 0.5h. After the dropping is completed, continue Insulation reaction 2h. Cool, stop stirring, and obtain the product itaconic acid-aspartic acid copolymer solutio...

Embodiment 3

[0037] Add 12.74g (0.098mol) of itaconic acid and 3.26g (0.025mol) of aspartic acid into the three-necked flask, the solvent is deionized water, and the mass ratio of deionized water to reactant monomer is 2.3. The flask is put into a constant temperature water bath adjusted to a certain temperature for heating, the temperature of the water bath is set according to the data in Table 3, the stirrer is turned on and stirred to dissolve itaconic acid and aspartic acid, and use 40% ( mass fraction) of sodium hydroxide solution to neutralize to a pH of 8-9. Use a constant pressure dropping funnel to add the initiator ammonium persulfate at a constant speed. The mass of ammonium persulfate is 9% of the total mass of the monomer. Under nitrogen protection, heat to reflux and stir mechanically. The dropping time is 0.5h. After the dropping is completed, continue Insulation reaction 2h. Cool, stop stirring, and obtain the product itaconic acid-aspartic acid copolymer solution of the pre...

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Abstract

The invention discloses itaconic acid-aspartic acid copolymerized phosphorus-free scale inhibitor, which is formed by copolymerizing itaconic acid and aspartic acid as monomers, and the general formula of the polymer is as follows: in formula (I), m, m / , and n are all integers from 1 to 10. The invention also discloses a method for preparing itaconic acid-aspartic acid copolymerized phosphorus-free scale inhibitor. The itaconic acid-aspartic acid copolymerized phosphorus-free scale inhibitor of the present invention introduces functional groups such as carboxyl groups and amide groups into the molecule, so that the polymer has excellent scale inhibition and dispersion properties for calcium carbonate; itaconic acid When the dosage of the water treatment agent copolymerized with aspartic acid is 14mg·L‑1, the scale inhibition rate to calcium carbonate is 96.4%, and the scale formed is soft and easily washed away by water, indicating that its dispersion performance is good . The preparation method of the itaconic acid-aspartic acid copolymerized phosphorus-free scale inhibitor of the present invention has easy-to-obtain raw materials for the synthesis of the copolymer, mild reaction conditions, biodegradable copolymerized products, no phosphorus, and no impact on the environment, and the synthesis cost is low. The post-processing cost is low.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis membrane water treatment agents, in particular to itaconic acid-aspartic acid copolymerized phosphorus-free scale inhibitor and a preparation method thereof. Background technique [0002] In the reverse osmosis membrane separation water system, adding antiscalants is to prevent calcium carbonate, calcium phosphate and calcium sulfate and other insoluble salts from depositing on the membrane surface, resulting in shortened life of reverse osmosis membrane, shortened operation cycle and increased cost. effective method. However, most of the reverse osmosis membrane antiscalants currently used in China are imported products from companies such as King Lee and Betz Dearbobu, which are expensive. With the increasing application of reverse osmosis membrane desalination technology, it is of great significance to study high-efficiency reverse osmosis membrane scale inhibitors with independent int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/08C02F5/10C02F1/44
Inventor 石文艳许伟吴俊颜秀花邵荣王俊琦
Owner 南通联膦化工有限公司