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Heavy metal chelating agent as well as preparation method and application thereof

A heavy metal chelating agent and reaction technology, applied in the direction of condensation/addition reaction to prepare amino compounds, organic chemistry, improvement of process efficiency, etc., can solve the problems of small chelation area, few chelation points, and small chelation volume, and achieve Effect of Chelating Performance Improvement

Active Publication Date: 2019-05-03
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heavy metal chelating agent can reduce the leaching concentration of heavy metals and ensure that the solidified fly ash sample block meets the leaching concentration limit value, but there are few chelating points, the formed chelating volume is small, and the chelating area is small, which cannot effectively settle the heavy metals in the garbage fly ash

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  • Heavy metal chelating agent as well as preparation method and application thereof
  • Heavy metal chelating agent as well as preparation method and application thereof

Examples

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Embodiment 1

[0074] The present embodiment provides a kind of heavy metal chelating agent, and its preparation method comprises the steps:

[0075] (1) Dissolve diethylenetriamine and solid sodium hydroxide in deionized water at 0°C, slowly add di-tert-butyl dicarbonate dropwise through the dropping funnel under vigorous stirring, and return to 25 ℃ for 3 hours to obtain unilaterally protected diethylenetriamine;

[0076] (2) Cool the above reaction system to 0°C with an ice-water bath again, and then slowly add 1,2-dichloroethane dropwise to it through the dropping funnel under vigorous stirring, and control the dropping rate for about 6 seconds per drop. After the dropping is completed, Return to 25°C and react for 2 hours to obtain crosslinked diethylenetriamine; the molar ratio of 1,2-dichloroethane to unilaterally protected diethylenetriamine is 1:2;

[0077] (3) Slowly add 6N HCl solution dropwise to the above reaction system until the pH value of the system reaches 4, and react at ...

Embodiment 2

[0080] The present embodiment provides a kind of heavy metal chelating agent, and its preparation method comprises the steps:

[0081] (1) Dissolve triethylenetetramine and solid potassium hydroxide in deionized water at 0°C, slowly add di-tert-butyl dicarbonate dropwise through the dropping funnel under vigorous stirring, and return to 20°C after the dropwise addition is completed. ℃ for 3 hours to obtain triethylenetetramine with unilateral protection;

[0082] (2) Cool the above reaction system to 0°C with an ice-water bath again, then slowly add 1,3-dichloropropane dropwise to it through the dropping funnel under vigorous stirring, and control the dropping rate for about 5 seconds per drop, and resume after the dropping is completed React at 30°C for 1 hour to obtain cross-linked triethylenetetramine; the molar ratio of the 1,3-dichloropropane to the unilaterally protected triethylenetetramine is 1:2;

[0083] (3) Slowly add 6N acetic acid solution dropwise to the above r...

Embodiment 3

[0086] The present embodiment provides a kind of heavy metal chelating agent, and its preparation method comprises the steps:

[0087] (1) Dissolve diethylenetriamine and solid sodium hydroxide in deionized water at 0°C, slowly add di-tert-butyl dicarbonate dropwise through the dropping funnel under vigorous stirring, and return to 30°C after the dropwise addition is completed. ℃ for 2 hours to obtain unilaterally protected diethylenetriamine;

[0088] (2) Cool the above reaction system to 0°C with an ice-water bath again, then slowly add 1,4-dichlorobutane dropwise through the dropping funnel under vigorous stirring, and control the dropping rate for about 5 seconds per drop. Return to 20°C and react for 3 hours to obtain crosslinked diethylenetriamine; the molar ratio of 1,4-dichlorobutane to unilaterally protected diethylenetriamine is 1:2;

[0089] (3) Slowly add 6N HCl solution dropwise to the above reaction system until the pH value of the system reaches 3.5, and react ...

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Abstract

The invention relates to a heavy metal chelating agent as well as a preparation method and application thereof, the preparation method comprises the following steps: taking a polyene polyamine molecule as a raw material, carrying out unilateral protection on the end group primary amine of the polyene polyamine molecule by using di-tert-butyl dicarbonate ester, carrying out chain extender cross-linking reaction on the polyene polyamine molecule and a chain extender, then removing the unilateral protection of the cross-linked polyene polyamine, and finally, carrying out xanthan acylation reaction on the cross-linked polyene polyamine and carbon disulfide to obtain the heavy metal chelating agent. The preparation method of the heavy metal chelating agent is high in operability and simple in process, and the prepared chelating agent contains more chelating sites, has high reaction activity and high chelating performance, and can be used for efficiently precipitating heavy metals.

Description

technical field [0001] The invention relates to the technical field of metal chelating agents, in particular to a heavy metal chelating agent and its preparation method and application, in particular to a heavy metal chelating agent with high reactivity and high chelating performance, its preparation method and application. Background technique [0002] Waste incineration fly ash is a dark gray or off-white fine powder, 90% of the fly ash particle size is less than 300μm, and the fly ash is often rich in copper, chromium, lead, zinc, cadmium, nickel, tin, manganese, mercury , arsenic and other heavy metals and their corresponding oxides, how to effectively deal with heavy metals in waste incineration fly ash is what we need to pay attention to. Chemical chelation method is a kind of treatment method of heavy metal fly ash with good effect and low cost, and it can also be applied to the treatment of large-scale fly ash. Based on this, the prior art discloses many artificiall...

Claims

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Application Information

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IPC IPC(8): C07C209/60C07C211/14A62D3/33A62D101/08A62D101/43
CPCY02P10/20
Inventor 胡清王峰唐一童立志胡滨
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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