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N-methyl, N-carboxymethyl dithio amidocarbonic acid chelating resin and its preparing method

A technology of carboxymethyldithiocarbamic acid and carboxymethylthiocarbamic acid, which is applied in the field of chelating resin and its synthesis, can solve the problem that the number of resin functional groups needs to be increased, and the selectivity has not been further studied and prepared. Complicated conditions and other issues, to achieve the effect of stable performance, easy synthesis, and wide application prospects

Active Publication Date: 2007-03-28
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The preparation conditions in the above synthesis reaction are relatively complicated, the number of functional groups of the obtained resin still needs to be improved, and there is no more in-depth and extensive research on the selectivity of the resin to specific heavy metals.
Literature search shows that there is no N-methyl group, N-methyl group with good selectivity for divalent heavy metals based on chloromethylated low-crosslinked macroporous polystyrene-divinylbenzene resin in the existing literature. Report on Synthesis of Chelating Resin Modified by Carboxymethyl Dithiocarbamate Group

Method used

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  • N-methyl, N-carboxymethyl dithio amidocarbonic acid chelating resin and its preparing method
  • N-methyl, N-carboxymethyl dithio amidocarbonic acid chelating resin and its preparing method
  • N-methyl, N-carboxymethyl dithio amidocarbonic acid chelating resin and its preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (a) Suspension polymerization.

[0024] Add a certain amount of dilute sodium hydroxide solution to the styrene monomer or directly filter the monomer through a resin column equipped with a strong base anion exchange resin to remove the polymerization inhibitor.

[0025] In a 1000mL beaker, add 210g styrene, 26g divinylbenzene, and 140g liquid paraffin, stir well and set aside.

[0026] In a 1000mL three-neck flask, add 600g of distilled water and raise the temperature to 40°C, then add 6g of gelatin, stir until completely dissolved, and at the same time raise the temperature to 50°C, add 2mL of methylene blue, stir well, add the above-mentioned styrene, divinylbenzene and liquid Add the initiator benzoyl peroxide 4.0g to the wax mixture; adjust the stirring speed to make the oil droplet size appropriate, gradually raise the temperature to 80°C at a speed of 1°C / 6min, keep it warm for 4 hours, and then gradually raise the temperature to 85°C Keep warm for 3 hours, keep...

Embodiment 2

[0036] The synthetic steps of another embodiment of the present invention are as follows:

[0037] (a) Utilize styrene as a monomer, divinylbenzene as a crosslinking agent, utilize liquid wax as a porogen, use magnesium carbonate as a dispersant, use benzoyl peroxide as an initiator, and adopt a suspension polymerization method to synthesize low Cross-linked macroporous polystyrene-divinylbenzene copolymer, choose steam distillation or use ethanol as solvent extraction to remove the residual porogen in the resin channels, and then dry it by airflow to obtain low cross-linked macroporous polystyrene - divinylbenzene resin, i.e. white balls.

[0038] Wherein the dosage of the crosslinking agent is 4% of the total amount of the monomer and the crosslinking agent, the dosage of the porogen is 40% of the weight of the monomer, and the crosslinking degree of the low crosslinking macroporous polystyrene is 2%.

[0039] (b) Soak the white ball in chloromethyl ether 4 times its weight...

Embodiment 3

[0042] The specific steps are the same as in Example 2, except that in step (a), the amount of the crosslinking agent is 12% of the total amount of the monomer and the crosslinking agent, the amount of the porogen is 60% of the weight of the monomer, and the low crosslinking macroporous polystyrene The degree of crosslinking is 6%. The chloromethylation reaction is carried out at a temperature of 45° C. in step (b). The N-methyl that makes, the functional group content of N-carboxymethyl dithiocarbamate chelating resin is 2.19mmol / g.

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Abstract

The invention discloses N-methyl, N-carboxymethyl dithiocarbamic acid chelating resin and its preparation method. The resin contains functional group-N-methyl, N-carboxymethyl dithiocarbamic acid group. The preparation method includes the following steps: using styrene as monomer, di-ethylene benzene as cross-linking agent, liquid wax as porosifer, magnesium carbonate as dispersant, benzoyl peroxide as initiator, zinc chloride as catalyst in chloromethylation process to react with chloro-methyl ether to gain chlorine ball with different chlorinity; then adding N-methyl, N-carboxymethyl dithio-amino sodium formate reagent to gain series N-methyl, N-carboxymethyl dithio-amino formyloxy chelating resin which has the advantages of easy synthesis, stable performance, high selectivity for heavy metal, wide application prospect in mineral product metallurgy producing mother liquor purifying, heavy metal production waste water harnessing reclaiming fields etc.

Description

1. Technical field [0001] The present invention relates to a kind of chelating resin and its synthetic method, specifically, refer to a kind of N-methyl, N-carboxymethyl dithiocarbamic acid chelating resin and its preparation method. 2. Background technology [0002] Chelating resins containing dithioaminocarboxylic acid groups are a kind of multi-coordination polymers, which can form chelates with large stability constants with many heavy metal ions, and have good adsorption properties and adsorption options for heavy metal ions sex. Chelating resins modified with different dithiocarbamic acid derivatives, the type and position of substituents will affect the complexation ability of different heavy metals, adjusting the type of substituents on the dithiocarbamic acid group can change the adsorption of heavy metals on the resin It can be used for separation and pre-enrichment of multi-component heavy metal systems. Therefore, this type of chelating resin has good applicati...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F8/30C08F8/34C08F8/44C08J9/04
Inventor 刘福强杨鑫李爱民杨立成龙超张全兴
Owner NANJING UNIV
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