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Sulfide heavy metal trapping agent and preparation method thereof

A heavy metal trapping agent and sulfide technology, which is applied in the fields of mercaptan preparation, chemical instruments and methods, organic chemistry, etc., can solve the problems of low yield, long synthesis route, and low zinc removal rate, and achieve short settling time, Easy to operate, not easy to secondary pollution effect

Inactive Publication Date: 2012-07-04
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the synthetic route of 3,3',5,5'-biphenyl tetracarbonyl chloride participating in this reaction is longer, and 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 trapping agent and preparation method thereof
  • Sulfide heavy metal trapping agent and preparation method thereof
  • Sulfide heavy metal trapping agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of sulfide heavy metal trapping agent N,N'-bis(2-mercaptoethyl)-1,3-benzenedicarboxamide, its preparation method is as follows:

[0029] At -5°C, in a 150mL three-necked flask, dissolve mercaptoethylamine hydrochloride to isophthaloyl chloride at a molar ratio of 2.9, that is, 4.94g of mercaptoethylamine hydrochloride and 3.05g of isophthaloyl chloride are dissolved in 65mL of chloroform, Add 5mL triethylamine, and react under stirring for 5 hours to obtain the heavy metal chelating agent N,N'-bis(2-mercaptoethyl)-1,3-benzenedicarboxamide (NBMIPA for short), and the reaction yield is 78.6%.

[0030] Infrared IR and nuclear magnetic NMR characterization results are as follows:

[0031] IR(KBr disk, cm -1 ): 3281.28 s(V NH), 3066.99 m{V C-H(Ar)}, 2932.02 m{V C-H(methylene)}, 2533.41 w (V SH), 1629.86 ss (V CO), 1529.32 ss (δ NH), 1290.56 m (V C-N), 1081.27 m (V C-S), 689.45 m {out-of-plane expansion C-H(Ar)}.

[0032] 1 H NMR (CDCl 3 , 300 MHz) δ(ppm): 1.445 ...

Embodiment 2

[0035] A kind of sulfide heavy metal trapping agent N,N'-bis(2-mercaptoethyl)-1,3-benzenedicarboxamide, its preparation method is as follows:

[0036] At 5°C, in a 150mL three-necked flask, dissolve mercaptoethylamine hydrochloride to isophthaloyl chloride at a molar ratio of 2.7, that is, dissolve 4.60 g of mercaptoethylamine hydrochloride and 3.05 g of isophthaloyl chloride in 65 mL of chloroform, and add 5mL of triethylamine was reacted for 4 hours under stirring to obtain the heavy metal chelating agent N,N'-bis(2-mercaptoethyl)-1,3-benzenedicarboxamide (NBMIPA for short), and the reaction yield was 54.9 %.

[0037]

Embodiment 3

[0039] A kind of sulfide heavy metal trapping agent N,N'-bis(2-mercaptoethyl)-1,3-benzenedicarboxamide, its preparation method is as follows:

[0040] At 20°C, in a 150 mL three-necked flask, dissolve mercaptoethylamine hydrochloride to isophthaloyl dichloride in a molar ratio of 1:2.3, that is, 3.92 g mercaptoethylamine hydrochloride and 3.05 g isophthaloyl chloride are dissolved in 65 mL of chloroform , add 5mL triethylamine, and react under stirring for 3 hours to obtain heavy metal chelating agent N,N'-bis(2-mercaptoethyl)-1,3-benzenedicarboxamide (NBMIPA for short), and the reaction yield was 25.3%.

[0041]

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Abstract

The invention discloses a sulfide heavy metal trapping agent N,N-bis(2-mercaptoethyl))-1,3-benzenedicarboxamide and a preparation method thereof. The preparation method of the trapping agent comprises the steps of: under the protection of nitrogen, at a certain temperature, dissolving thioethanolamine hydrochloride and isophthaloyl dichloride into trichloromethane, adding an acid binding agent, and stirring for reacting to obtain the N,N-bis(2-mercaptoethyl))-1,3-benzenedicarboxamide. The sulfide heavy metal trapping agent provided by the invention is used for treating industrial wastewater containing heavy metal ions, can effectively avoid generating hydrogen sulfide, and reacts with various heavy metal ions in the wastewater for rapidly reacting at normal temperature to generate a water insoluble sulfide precipitate which has large particle size and compact flocculating constituent; and sedimentation time is shortened, heavy metals can be recycled from residuals, and secondary pollution can not be easily caused. The preparation method has the advantages of simple 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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IPC IPC(8): C02F1/62C07C323/42C07C319/12
Inventor 王风贺王国祥张帆
Owner NANJING NORMAL UNIVERSITY
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