Sulfide heavy metal chelating agent and preparation method thereof

A heavy metal collector and sulfide technology, applied in chemical instruments and methods, water pollutants, organic chemistry, etc., can solve the problems of low yield, low zinc removal rate, long synthesis route, etc., and achieve short settling time. , Not easy to secondary pollution, easy to operate

Inactive Publication Date: 2014-01-22
南京正隆顺达高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthetic route of 3,3',5,5'-biphenyl tetracarbonyl chloride participating in the reaction is longer and the yield is lower
In addition, the resulting sulfide heavy metal chelating collector does not have a high removal rate for zinc

Method used

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  • Sulfide heavy metal chelating agent and preparation method thereof
  • Sulfide heavy metal chelating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of sulfide heavy metal collector N 1 ,N 2 ,N 4 ,N 5 -Tetrakis(2-mercaptoethyl) 1,2,4,5-pyromelliticamide, the preparation method of which is as follows:

[0025] At 20°C, in a 150mL three-neck flask, dissolve mercaptoethylamine hydrochloride to pyromellitic anhydride at a molar ratio of 4.4, that is, dissolve 5.0 g of mercaptoethylamine hydrochloride and 2.18 g of pyromellitic anhydride in 75 mL of dimethylformaldehyde In the amide, react under stirring for 4 hours to obtain the heavy metal chelating collector N 1 ,N 2 ,N 4 ,N 5 -Tetrakis(2-mercaptoethyl) 1,2,4,5-pyromellitic tetracarboxamide (TMBTC for short), the reaction yield is 22.43%.

[0026] Infrared IR and nuclear magnetic NMR characterization results are as follows:

[0027] IR(KBr disk, cm -1 ): 3211.79 s(V N- H), 2542.12w( S-H ), 1677.28(V C=O), 1608 ss (δ in-plane bending N-H), 1417.85 m (V C=C), 1296.99ss (V C-N), 1296.99 m (V C-N), 1104.09 (V C-S), 678.42 {out-of-plane stretch C-H(Ar)}. ...

Embodiment 2

[0030] A kind of sulfide heavy metal collector N 1 ,N 2 ,N 4 ,N 5 -Tetrakis(2-mercaptoethyl) 1,2,4,5-pyromelliticamide, the preparation method of which is as follows:

[0031] At 5°C, in a 150mL three-neck flask, dissolve mercaptoethylamine hydrochloride to pyromellitic anhydride at a molar ratio of 4.8, namely 5.46 g of mercaptoethylamine hydrochloride and 2.18 g of pyromellitic anhydride in 75 mL of dimethylformaldehyde In the amide, react under stirring for 6 hours to obtain the heavy metal chelating collector N 1 ,N 2 ,N4 ,N 5 -Tetrakis(2-mercaptoethyl) 1,2,4,5-pyromellitic tetracarboxamide (TMBTC for short), the reaction yield is 51.62%.

Embodiment 3

[0033] A kind of sulfide heavy metal collector N 1 ,N 2 ,N 4 ,N 5 -Tetrakis(2-mercaptoethyl) 1,2,4,5-pyromelliticamide, the preparation method of which is as follows:

[0034] At -5°C, in a 150mL three-necked flask, dissolve mercaptoethylamine hydrochloride to pyromellitic anhydride at a molar ratio of 5.2, that is, 5.91 g of mercaptoethylamine hydrochloride and 2.18 g of pyromellitic anhydride are dissolved in 75 mL of dimethyl In formamide, react under stirring for 8 hours to obtain the heavy metal chelate collector N 1 ,N 2 ,N 4 ,N 5 -Tetrakis(2-mercaptoethyl) 1,2,4,5-pyromellitic tetracarboxamide (TMBTC for short), the reaction yield is 76.17%.

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Abstract

The invention discloses a sulfide heavy metal chelating agent N1,N2,N4,N5-tetra(2-sulfydrylethyl)1,2,4,5-pyromellitic formamide and a preparation method thereof. The preparation method of the chelating agent comprises the following steps of: dissolving certain mol ratios of mercaptoethylamine hydrochloride and pyromellitic formic anhydride into dimethylformamide (DMF) at a certain temperature; agitating to react for a period of time and filtering to obtain the N1,N2,N4,N5-tetra(2-sulfydrylethyl)1,2,4,5-pyromellitic formamide. The sulfide heavy metal chelating agent provided by the invention is used for treating industrial wastewater containing heavy metal ions and can effectively avoid the generation of hydrogen sulfide; the sulfide heavy metal chelating agent can be rapidly reacted with various heavy metal ions in the wastewater at a room temperature to generate water-dissoluble sulfide sediment; the sediment is large in grain size and compact in flocs, so that the deposition time is shortened, heavy metal can be recycled from residues, and secondary pollution is not easy to happen. The sulfide heavy metal chelating agent N1,N2,N4,N5-tetra(2-sulfydrylethyl)1,2,4,5-pyromellitic formamide and the preparation method thereof, provided by the invention, have the advantages of simple preparation process, convenience for use and good treatment effect.

Description

technical field [0001] The invention relates to the precipitation, solidification or trapping technology of heavy metal ions in the environment, in particular to a sulfide heavy metal trapping agent and its preparation method, and its application in heavy metal pollution control. Background technique [0002] Although my country's environmental protection has made positive progress, the severe environmental situation remains unchanged. The long-term accumulated environmental contradictions have not been resolved, especially the discharge of heavy metal pollutants exceeds the capacity of the environment, seriously endangering the health of the people. In recent years, the discharge of various heavy metal wastewater has caused serious soil and water pollution, which has aroused widespread concern at home and abroad. [0003] The traditional pH adjustment precipitation method treats wastewater containing heavy metal ions, that is, by adding alkaline chemicals such as sodium hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C323/42C02F1/62C02F1/52C02F101/20
Inventor 王风贺雷武夏明珠王风云
Owner 南京正隆顺达高分子材料有限公司
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