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Green rust-polydimethyldiallylammonium chloride in-situ composite coagulant and its preparation method and application

A technology of polydimethyldiallyl ammonium chloride and dimethyldiallyl ammonium chloride, applied in green rust-polydimethyldiallylammonium chloride in-situ composite coagulant and Its preparation field can solve the problems of poor water treatment effect and high cost, and achieve the effect of improving coagulation effect, good effect and improving stability

Active Publication Date: 2022-04-19
CHANGZHOU QINGLIU WATER TREATMENT AGENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems of poor water treatment effect and high cost when the existing PDMDAAC is used alone, a green rust-polydimethyldiallylammonium chloride in-situ composite coagulant and its preparation method and application are provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of green rust-polydimethyldiallylammonium chloride in-situ composite coagulant comprises the steps:

[0026] 5.56g FeSO 4 ·7H 2 O was dissolved in 100mL deionized water, and 10g of dimethyl diallyl ammonium chloride monomer (monomer concentration 50wt%) was added simultaneously, stirred evenly, then nitrogen gas was introduced to replace the air, heated to 60°C, and the pH= 7. The color of the reaction system starts to change from light green to light yellow (at this time, Fe(II) is partially oxidized to Fe(III)); then add 5mL of 6g / L ammonium persulfate solution, keep the reaction for 6.5h, drop Add 1mol / L NaOH solution for titration, when the solution changes from light yellow to dark green, the pH value is 8.2, stop adding lye, seal and age at room temperature for 24 hours to get green rust-polydimethylmethanate Based diallyl ammonium chloride in-situ composite coagulant, abbreviated as in-situ GR / PDMDAAC.

Embodiment 2

[0037] The preparation method of green rust-polydimethyldiallylammonium chloride in-situ composite coagulant comprises the steps of: 4.53g FeCl 2 Dissolve in 100mL deionized water, add 15g dimethyl diallyl ammonium chloride monomer (monomer concentration 50wt%) at the same time, stir evenly, then pass in nitrogen to replace the air, heat to 75°C, adjust pH=7 , the color of the reaction system began to change from light green to light yellow (at this time, Fe(II) was partially oxidized to Fe(III)), then 5 mL of 8 g / L ammonium persulfate solution was added, and the reaction was kept for 6 hours. After the reaction, 1 mol / L of NaOH solution for titration, when the solution changes from light yellow to dark green, the pH is 8.5, stop adding lye, seal and age at room temperature for 24 hours to obtain green rust-polydimethyldiallyl ammonium chloride in-situ composite coagulant.

Embodiment 3

[0039] The preparation method of green rust-polydimethyldiallylammonium chloride in-situ composite coagulant comprises the steps of: 2.27g FeCl 2 and 2.78gFeSO 4 ·7H 2 O was dissolved in 100mL of deionized water, and 10g of dimethyldiallyl ammonium chloride monomer (monomer concentration 50wt%) was added simultaneously, stirred evenly, then nitrogen gas was introduced to replace the air, heated to 50°C, and the pH= 7. The color of the reaction system starts to change from light green to light yellow (at this time, Fe(II) is partially oxidized to Fe(III)), then add 4mL of 10g / L ammonium persulfate solution, keep it warm for 8h, and drop Titrate with 1mol / L NaOH solution, when the solution changes from light yellow to dark green, the pH value is 9.0, stop adding lye, seal and age at room temperature for 24 hours to obtain green rust-polydimethyldimethene Allyl ammonium chloride in-situ composite coagulant.

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Abstract

The invention relates to green rust-polydimethyldiallylammonium chloride in-situ composite coagulant and its preparation method and application, comprising the following steps: under stirring, Fe(II)-containing solution and dimethyl diene After the propylammonium chloride is mixed evenly, flush into nitrogen, then heat, adjust the pH value to 7, add the initiator solution, keep warm and continue the reaction. Add lye, seal and age at room temperature to get the green rust-polydimethyldiallylammonium chloride in-situ composite coagulant; dimethyldiallylammonium chloride contains Fe(II) The mass concentration in the solution is 100-300g / L; the addition amount of the initiator is 0.2-0.8% of the mass of dimethyl diallyl ammonium chloride. The in-situ composite coagulant prepared by controlling the partial oxidation of Fe(II) to Fe(III) in the in-situ synthesis process of the present invention is used for sewage treatment with a turbidity reduction rate of 95% or more, and the coagulation effect is good.

Description

technical field [0001] The invention relates to the technical field of coagulants used in water treatment, in particular to a green rust-polydimethyldiallylammonium chloride in-situ composite coagulant and a preparation method and application thereof. Background technique [0002] High-efficiency water treatment chemicals are key technical areas for development in the environmental protection water pollution control industry. The more common coagulants used are inorganic coagulants and organic polymer coagulants. Inorganic coagulants are cheap, but they are greatly affected by the sewage environment and the treatment effect is not good; compared with inorganic coagulants, organic coagulants Polymer coagulants have the advantages of less dosage, less sludge generation, short settling time, little impact on sewage environment, and good coagulation effect, but their price is relatively high. With the rapid development of the economy, it is difficult for a single system coagula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C08F126/02
CPCC02F1/56C08F126/02
Inventor 韩晓刚陆亭伊顾一飞闵建军顾玲玲陆永生徐喜旺蒋晓春
Owner CHANGZHOU QINGLIU WATER TREATMENT AGENT
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