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

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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.
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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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Example Embodiment

[0022] Example 1

[0023] (a) Suspension polymerization.

[0024] Styrene monomer is added to a certain amount of dilute sodium hydroxide solution or the monomer is directly filtered through a resin column containing a strong base anion exchange resin to remove the polymerization inhibitor.

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

[0026] In a 1000mL three-necked flask, add 600g of distilled water and raise the temperature to 40°C, then add 6g of gelatin, stir to completely dissolve, and at the same time warm up to 50°C, add 2mL of methine blue, stir evenly, add the above styrene, divinylbenzene and liquid For the wax mixture, add 4.0g initiator benzoyl peroxide; adjust the appropriate stirring speed to make the oil bead size suitable, gradually increase the temperature to 80℃ at a speed of 1℃ / 6min, keep it for 4h, and then gradually increase the temperature to 85℃ Insulate for 3h, 90°C for...

Example Embodiment

[0035] Example 2

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

[0037] (a) Use styrene as monomer, divinylbenzene as crosslinking agent, liquid wax as porogen, magnesium carbonate as dispersant, benzoyl peroxide as initiator, suspension polymerization method, low synthesis Cross-linked macroporous polystyrene-divinylbenzene copolymer, using steam distillation or ethanol extraction as a solvent to remove the residual porogen in the resin pores, and then air drying to obtain low cross-linked macroporous polystyrene -Divinylbenzene resin, that is, white balls.

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

[0039] (b) Soak the white ball in chloromethyl ether 4 times its weight, add 20% of the weight of the white ball zinc chloride as a catalyst, ...

Example Embodiment

[0041] Example 3

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