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Amphiprotic high-molecule chelated flocculating agent and preparation method thereof

A technology of amphoteric polymers and flocculants, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of limited number of chelating groups, loose flocs, and reduced flocculation and settlement performance, so as to promote the formation and growth of flocs , The floc is dense and coarse, and the effect of sediment dehydration is good

Inactive Publication Date: 2009-11-25
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned heavy metal treatment agents and small molecule heavy metal precipitants generally form smaller particles, poor settling performance, and low treatment efficiency for complexed heavy metal wastewater. Generally, flocculants are added, and small molecules are easy to remain in the treated water, causing secondary pollution. Secondary pollution; while the polymer chelating agent has a relatively large molecular weight, although it has a certain flocculation effect, it generally has the problem that the number of chelating groups is limited, and the steric hindrance of the polymer chain makes the chelating group and the heavy metal ion The binding ability of the chelating group is reduced, and due to the steric mismatch of the chelating group, some of the chelating group is not combined with the heavy metal ion and "suspended", causing the flocs to repel each other with excess negative charges, and the formed flocs are loose and It is difficult to form large flocs and reduce the flocculation and sedimentation performance. Therefore, it is also necessary to add a flocculant to obtain a better flocculation and sedimentation effect

Method used

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  • Amphiprotic high-molecule chelated flocculating agent and preparation method thereof
  • Amphiprotic high-molecule chelated flocculating agent and preparation method thereof
  • Amphiprotic high-molecule chelated flocculating agent and preparation method thereof

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Embodiment 1

[0057] (1) According to the molar ratio of dimethyl diallyl ammonium chloride (DMDAAC) and acrylamide (AM) as 0.05:1, 14.22 g of refined acrylamide (AM) and 1.62 g of dimethyl diallyl were respectively Add ammonium chloride (DMDAAC) into a 500mL three-neck flask with a dropping funnel and a mechanical stirrer, and add 143mL of deionized water to dissolve to make a solution with a mass percentage concentration of 10%;

[0058] (2) pass N in the solution of step (1) 2 Expel oxygen for 30min, raise the temperature to 50°C, add 2 mL of ammonium persulfate solution with a mass percentage concentration of 5% dropwise within 60min, after the reaction for 3h, add dropwise the remaining 0.6mL of ammonium persulfate solution, raise the temperature to 55°C, and react for 1h, A colorless or light yellow viscous liquid was obtained; take a small amount of the viscous liquid and dilute it with methanol, then drop the diluted viscous liquid into acetone for precipitation, repeat the precipit...

Embodiment 2

[0063] (1) prepare the copolymer P (DMDAAC-AM) of DMDAAC and AM according to the proportioning and operation steps of embodiment 1, measure its intrinsic viscosity [η] and be 483mL / g, and cationicity is 4.63mol%;

[0064] (2) in step (1) colorless or light yellow viscous liquid is added 158mL deionized water to be made into a solution with a mass percentage concentration of 5%, and NaOH solution is added to adjust pH to 10.3;

[0065] (3) In the solution of step (2), the molar ratio of AM, formaldehyde and triethylenetetramine is 1:0.9:1.0, drop 13.3 mL of formaldehyde solution with a mass percentage concentration of 37.0%, and react at 45°C for 30min , and then 31.5 mL of triethylenetetramine was added to continue the reaction for 3h;

[0066] (4) the solution of step (3) is lowered to room temperature, the molar ratio of N atom, alkali and carbon disulfide in the triethylenetetramine molecule is 1: 1.2: 0.9, adding 85.3g mass percent concentration is 45% NaOH solution, and t...

Embodiment 3

[0068] (1) prepare the copolymer P (DMDAAC-AM) of DMDAAC and AM according to the proportioning and operation steps of embodiment 1, measure its intrinsic viscosity [η] and be 469mL / g, and cationicity is 4.71mol%;

[0069] (2) in step (1) colorless or light yellow viscous liquid is added 158mL deionized water to be made into a solution with a mass percentage concentration of 5%, and KOH solution is added to adjust pH to 10.5;

[0070] (3) In the solution of step (2), the molar ratio of AM, formaldehyde and triethylenetetramine is 1:1.0:1.1, drop 14.8 mL of formaldehyde solution with a mass percentage concentration of 37.0%, and react at 45°C for 30min , and then added 34.6 mL of triethylenetetramine to continue the reaction for 3h;

[0071] (4) the solution of step (3) is lowered to room temperature, and the molar ratio of N atom, alkali and carbon disulfide in triethylenetetramine molecule is 1: 1.3: 1.0, adding 143g mass percent concentration is 45% KOH solution, and then dri...

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Abstract

The invention relates to amphiprotic high-molecule chelated flocculating agent for various heavy metal waste water treatments and preparation method thereof. The amphiprotic high-molecule chelated flocculating agent of the invention is formed by following steps: configuring a basic skeleton by cationic dimethyl diallyl ammonium chloride and acrylamide copolymer; reacting with aldehydes and polyamine through Mannich to connect the polyamine to the high-molecule chain; then reacting with carbon bisulfide in alkaline condition. The invention mainly overcomes the disadvantages that the existing high-molecule chelating agent has excessive flocs negative charge caused by the suspension of part chelating radical because the space steric resistance of high-molecule chain and chelated radical are not matched so as to reduce the flocculating settling performance and the traditional heavy metal waste water processing method has complicated technique, high cost, low efficiency and cannot be suitable for large-scaled heavy metal waste water treatment. The invention is widely applied to the heavy metal waste water treatment of various types, in particular suitable for removing the heavy metal ions in industrial waste water and domestic sewage.

Description

technical field [0001] The invention relates to a heavy metal ion treating agent integrating chelating heavy metal ions and flocculation functions, in particular to an amphoteric polymer chelating flocculant and a preparation method thereof. Background technique [0002] Heavy metal pollution refers to the environmental pollution caused by elements with significant biological toxicity such as Hg, Cd, Pb, Cr and As and general heavy metals with certain toxicity, such as Zn, Cu, Co, Ni, Sn and other elements. Heavy metal wastewater is one of the industrial wastewaters with the most serious environmental pollution and the greatest harm to human beings. [0003] Traditional heavy metal wastewater treatment methods, such as chemical precipitation, redox, ferrite, ion exchange, electrochemical, adsorption, evaporative concentration and electrodialysis, all have technical or treatment costs. problem, it is difficult to promote in practical application. Especially with the develop...

Claims

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Application Information

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IPC IPC(8): C02F1/56
Inventor 刘立华曾荣今吴俊肖体乐令玉林
Owner HUNAN UNIV OF SCI & TECH
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