Acrylic acid pyridine chelating resin as well as preparation method and application thereof

A technology of acrylic pyridine and chelating resin, which is applied in the field of acrylic pyridine chelating resin and its preparation, can solve the problems of complex synthesis path, reduced adsorption capacity, slow adsorption rate, etc., and achieve simple preparation process, large adsorption capacity, The effect of fast adsorption rate

Inactive Publication Date: 2015-07-15
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems in the prior art that the synthesis route of chelating resin is complicated, and the adsorption capacity is obviously reduced in a high-acid and high-salt environment, the invention provides an acrylic pyridine chelating resin and its preparation method and application. Low cost and simple operation. Due to the hydrophilicity of the polyacrylic acid resin skeleton, the adsorption rate of heavy metals is fast. In addition, due to the high modification amount of resin functional groups, the adsorption amount of heavy metals is large.
Therefore, the acrylic pyridine chelating resin provided

Method used

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  • Acrylic acid pyridine chelating resin as well as preparation method and application thereof
  • Acrylic acid pyridine chelating resin as well as preparation method and application thereof
  • Acrylic acid pyridine chelating resin as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of acrylic acid pyridine chelating resin, the steps are:

[0043] 1) Add 250mL containing 0.2% (mass fraction) polyvinyl alcohol, 4% (mass fraction) NaCl aqueous solution in the 500mL there-necked flask equipped with stirrer, reflux condenser and thermometer, under the stirring speed of 50rpm, heat up to 40 ℃ , keep for 1h;

[0044] 2) Add 25g of methyl acrylate, 1g of triallyl cyanurate, 0.2mL of ethyl acetate, 0.2mL of n-heptane and 0.2g of benzyl peroxide into the three-necked flask of step 1) at a stirring speed of 50rpm For the mixed solution composed of acyl, adjust the stirring speed to 50rpm, control the size range of oil droplets to 5-500μm, then raise the temperature to 55℃ at a speed of 0.2℃ / min, polymerize for 1h, then raise the temperature to 70℃, polymerize for 2h, continue Raise the temperature to 80°C, polymerize for 2 hours, then raise the temperature to 95°C, react at constant temperature for 2 hours, and stop the reaction;

[00...

Embodiment 2

[0051] A preparation method of acrylic acid pyridine chelating resin, the steps are:

[0052] 1) Add 250mL containing 8% (mass fraction) gelatin, 23% (mass fraction) NaCl aqueous solution in the 500mL there-necked flask equipped with stirrer, reflux condenser and thermometer, under 80rpm stirring speed, be warming up to 40 ℃, keep 1h;

[0053] 2) Add 25g of methyl acrylate, 20g of triallyl cyanurate, 55mL of toluene, 60mL of n-heptane and 24g of azobisisobutyronitrile into the three-necked flask of step 1) at a stirring speed of 70rpm Liquid, adjust the stirring speed to 80rpm, control the size range of oil droplets to 2-300μm, then raise the temperature to 70℃ at a speed of 8℃ / min, polymerize for 25h, then raise the temperature to 80℃, polymerize for 50h, continue to raise the temperature to 95℃ , polymerized for 50 hours, then raised the temperature to 110°C, reacted at constant temperature for 50 hours, and stopped the reaction;

[0054] 3) The reaction product in the abo...

Embodiment 3

[0060] A preparation method of acrylic acid pyridine chelating resin, the steps are:

[0061] 1) In a 500mL three-necked flask equipped with a stirrer, a reflux condenser and a thermometer, add 250mL containing 1.5% (mass fraction) Gur gum, 20% (mass fraction) NaCl aqueous solution, at a stirring speed of 100rpm, heat up to 40°C , keep for 1h;

[0062] 2) Add 25g of methyl acrylate, 1g of trimethacrylate (trimethylolpropyl) ester, 15mL of ethyl acetate, 40mL of n-heptane and 0.2g of supernatant to the three-necked flask of step 1) at a stirring speed of 100rpm. For the mixture composed of benzoyl oxide, adjust the stirring speed to 90rpm, control the size of the oil droplet to 1-250μm, then raise the temperature to 65°C at a speed of 4°C / min, polymerize for 5h, then raise the temperature to 75°C, and polymerize for 2h , continue to heat up to 85°C, polymerize for 5 hours, then heat up to 95°C, react at constant temperature for 10 hours, and stop the reaction;

[0063] 3) Ext...

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Abstract

The invention discloses an acrylic acid pyridine chelating resin as well as a preparation method and application thereof, and belongs to the field of modified resin synthesis. A basic structure unit of the resin is as shown in the specification, wherein x represents polyamines with different chain lengths; resin microspheres are faint yellow; the particle sizes are 0.15-1.20mm; and the functional group content is 1.08-3.01mmol/g. The chelating resin disclosed by the invention is wide in preparation material source, low in cost, and simple in operation step. Due to the hydrophilcity of a polyacrylic resin skeleton, the adsorption rate on heavy metal is high. In addition, due to high modification quantity of the resin functional group, the adsorption quantity on heavy metal is large. The acrylic acid pyridine chelating resin disclosed by the invention can be applied to the fields such as mining and metallurgy production, mother liquid purification, removal of heavy metal in a high-acid and high-salt complicated system and separation and pre-enrichment of the heavy metal in environment analysis; the technical problems of small adsorption amount, low adsorption rate, large in required resin amount in engineering, long operation time and the like when the heavy metal is selectively adsorbed are solved; and the economic benefits and the environment benefits are significant.

Description

technical field [0001] The invention belongs to the field of modified resin synthesis, and more specifically relates to an acrylic pyridine chelating resin and its preparation method and application. Background technique [0002] Heavy metal ions in industrial wastewater usually coexist with high-concentration inorganic salts in complex environments such as high-concentration acids. The presence of alkali metal ions and hydrogen ions will have a strong competitive effect on the adsorption sites and seriously weaken the removal efficiency of heavy metal ions. Conventional Ion exchange resins cannot effectively selectively remove and separate and recover heavy metal ions in such complex systems. Pyridine chelating resin has the characteristics of high selectivity for heavy metals, acid resistance, and high pollution resistance of inorganic salts. It is a heterocyclic nitrogen atom coordination chelating resin. The atomic electron cloud density is reduced, it is not easy to pr...

Claims

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Application Information

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IPC IPC(8): C08F120/60C08F2/20C08F120/14C08F8/32
Inventor 刘福强张小朋陈达陶学文朱长青韦蒙蒙张艳红白志平李爱民
Owner NANJING UNIV
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