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High molecular heavy metal chelating flocculant and preparation method thereof

A heavy metal and polymer technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., to achieve the effects of easy operation and control, high yield, and easy access to raw materials

Inactive Publication Date: 2012-06-13
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems existing in the existing polymer chelating flocculant, the present invention provides a polymer heavy metal chelating flocculant and its preparation method

Method used

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  • High molecular heavy metal chelating flocculant and preparation method thereof
  • High molecular heavy metal chelating flocculant and preparation method thereof
  • High molecular heavy metal chelating flocculant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) According to the molar ratio of diallylmethylamine and epichlorohydrin as 1:1, respectively add 29.2mL diallylmethylamine and 15.8mL epichlorohydrin into the Add 300mL tetrahydrofuran to a 500mL three-neck flask with a reflux condenser and a mechanical stirrer, stir evenly, and heat up to 60°C for 10h;

[0034] (2) Add 21.9mL of diethylenetriamine dropwise, continue the reaction at 60°C for 6h, then distill off the solvent tetrahydrofuran to obtain 63.7g of crude monomer (pale yellow paste);

[0035] (3) Add 575mL of deionized water to dissolve the paste obtained in step (2) to form a solution with a mass percentage concentration of 10%, add activated carbon for decolorization, and then filter, and the filtrate is concentrated to a monomer mass percentage concentration by evaporation under reduced pressure Reach 60%, get refined monomer solution; Then pass N 2 Drive oxygen for 30 minutes, heat up to 60°C, add 712 mg of ammonium persulfate, react for 9 hours, and ob...

Embodiment 2

[0038] (1) According to the molar ratio of diallylmethylamine and epichlorohydrin as 1:1.02, respectively add 29.2mL of purified diallylmethylamine and 16.2mL of epichlorohydrin to the In the 1000mL three-neck flask with funnel, reflux condenser and mechanical stirrer, add 450mL tetrahydrofuran and stir evenly, heat up to 65°C and react for 9h;

[0039] (2) Add 29.9 mL of triethylenetetramine dropwise to the solution in step (1) and continue the reaction at 65°C for 5 hours, then distill off the solvent tetrahydrofuran to obtain 73.1 g of crude monomer (light yellow paste);

[0040] (3) Add 658mL of deionized water to dissolve the paste obtained in step (2) to form a solution with a mass percent concentration of 10%, add activated carbon for decolorization, and then filter, and the filtrate is concentrated to a monomer mass percent concentration by evaporation under reduced pressure Reach 65%, get refined monomer solution; Then pass N 2 Drive oxygen for 30 minutes, raise the ...

Embodiment 3

[0043] (1) According to the molar ratio of diallylmethylamine and epichlorohydrin as 1:1.05, respectively add 29.2mL of purified diallylmethylamine and 16.7mL of epichlorohydrin to the Into a 1000mL three-necked flask with a funnel, a reflux condenser and a mechanical stirrer, add 600mL of tetrahydrofuran, stir evenly, and heat up to 70°C for 9 hours;

[0044] (2) Add 38.4 mL of tetraethylenepentamine dropwise to the solution in step (1) and continue the reaction at 70°C for 5 hours, then distill off the solvent tetrahydrofuran to obtain 81.2 g of crude monomer (pale yellow paste);

[0045] (3) Add 730mL of deionized water to dissolve the paste obtained in step (2) to form a solution with a mass percent concentration of 10%, add activated carbon for decolorization, and then filter, and the filtrate is concentrated to a monomer mass percent concentration by evaporation under reduced pressure Reach 70%, get refined monomer solution; Then pass N 2 Drive oxygen for 30 minutes, ra...

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Abstract

The invention discloses a high molecular heavy metal chelating flocculant and a preparation method thereof. The high molecular heavy metal chelating flocculant is prepared by the following steps of: quaternizing diallyl methylamine and epoxy chloropropane in an organic solvent, and grafting polyethylene polyamine onto molecules by performing epoxy group ring opening with polyethylene polyamine; decolorizing with active carbon, and evaporating and concentrating to obtain a diallyl quaternary ammonium salt monomer solution; polymerizing through a free radical aqueous solution to synthesize a diallyl quaternary ammonium salt polymer; and reacting with carbon bisulfide and sodium hydroxide. The high molecular heavy metal chelating flocculant is characterized in that: each structural unit of ahigh molecular chain is provided with a positive charge and a plurality of strong chelation groups -CSS- with negative charges, so that the defect of non-uniform positive charge distribution of the conventional ampholytic chelating flocculant is avoided, neutralization of negative charges produced in a floc forming process is facilitated, a floc structure is improved, the formation and growth of floc are promoted, the heavy metal ion chelating capability and flocculating settling performance are enhanced, and the size of sediments is reduced.

Description

technical field [0001] The invention belongs to the field of heavy metal sewage treatment, in particular to a polymer heavy metal chelating flocculant integrating chelating heavy metal ions and flocculation functions and a preparation method thereof. Background technique [0002] Wastewater discharged from mining ore dressing, non-ferrous metal smelting, mechanical processing, electrolysis, electroplating, pesticides, medicines, paints, pigments and other enterprises all contain various heavy metal ions, and their types, contents and existing forms vary with different production enterprises. Heavy metal wastewater has become one of the most harmful wastewater to humans because heavy metals cannot be biodegraded and are easy to accumulate in organisms and cause poisoning. Heavy metals cannot be decomposed and destroyed, and the various treatment methods currently developed can only transfer their existing locations and change their physical and chemical forms. For example, t...

Claims

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Application Information

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IPC IPC(8): C02F1/56C02F1/62
Inventor 刘立华李鑫曾荣今周智华徐国荣
Owner HUNAN UNIV OF SCI & TECH
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