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Cross-linking agent modified XAD-4 resin and method for preparing same

A technology of XAD-4 and cross-linking agent, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of small adsorption capacity and increased operation complexity, and achieve narrow pore size distribution, improved adsorption capacity, and improved pore size. structure effect

Inactive Publication Date: 2014-08-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, on the one hand, because the skeleton of XAD-4 resin is polystyrene with strong hydrophobicity, its strong hydrophobicity makes it need to be pretreated with polar reagents (such as: methanol) before use, which increases the complexity of operation ; On the other hand, because XAD-4 resin is a macroporous resin, the pore size distribution is relatively wide (tested by BJH method, its pore size distribution is 2~15nm; tested by DFT method, its pore size distribution is 2~30nm), so its The adsorption capacity of small molecular compounds (such as: phenol) is not large

Method used

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  • Cross-linking agent modified XAD-4 resin and method for preparing same
  • Cross-linking agent modified XAD-4 resin and method for preparing same
  • Cross-linking agent modified XAD-4 resin and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 9.5g of XAD-4 resin to a 250mL three-necked flask equipped with a mechanical stirrer, a reflux condenser and a thermometer, dissolve 7.9g of DCX with 50mL of anhydrous 1,2-dichloroethane and add it to the three-necked flask, and mix the solution Swell in an ice-water bath at 0-5°C for 12 hours. Under medium-speed stirring, 11 mL of anhydrous tin tetrachloride was added to the three-necked flask and kept for 2 hours; the temperature was raised to 60°C for 8 hours, and then the temperature was raised to 80°C for 4 hours. Terminate the reaction with absolute ethanol, pour out the solution, alternately wash 3 times with 1% hydrochloric acid aqueous solution and absolute ethanol, transfer the resin to a Soxhlet extractor, extract the resin with absolute ethanol for 8 hours, and vacuum-dry spare. The specific surface area of ​​the resin is 841.7m 2 / g, pore volume 0.7686cm 3 / g, pore size distribution 1~8.8nm, average pore size 3.65nm.

Embodiment 2

[0033] Dissolve 18.10g of BCMBP in 120mL of 1,2-dichloroethane, add it into a 250mL three-neck flask, then add 15.0g of XAD-4 resin into the three-necked flask, and swell at 0~5°C for 24 hours. Start the mechanical stirring, quickly add 18mL of anhydrous tin tetrachloride to the three-necked bottle, and keep it for 3 hours; then raise the temperature of the mixed solution to 60°C for 10 hours, then raise the temperature to 85°C for 4 hours. The reaction was terminated with acetone, the solution was poured out, and washed three times alternately with 1% aqueous hydrochloric acid and absolute ethanol until the solution was clear. Transfer the resin to a Soxhlet extractor, extract the resin with absolute ethanol for 12 hours, and dry it in vacuum for later use. The specific surface area of ​​the resin is 1228m 2 / g, pore volume 1.068cm 3 / g, pore size distribution 1~8.6nm, average pore size 3.43nm.

Embodiment 3

[0035]Add 10.0g of XAD-4 resin to a 250mL three-necked flask equipped with a mechanical stirrer, reflux condenser and thermometer, dissolve 13.20g of DPB with 60mL of 1,2-dichloroethane and add it to the three-necked flask, and the mixed solution is at 0~ Swell in an ice-water bath at 5°C for 12 hours. Under medium-speed stirring, add 10.8 mL of anhydrous tin tetrachloride to the three-necked flask in an ice-water bath and keep it for 2 hours; raise the temperature to 65°C and keep it for 8 hours, then raise the temperature to 80°C and keep it for 4 hours. Terminate the reaction with absolute ethanol, pour out the solution, alternately wash 3 times with 1% hydrochloric acid aqueous solution and absolute ethanol, transfer the resin to a Soxhlet extractor, extract the resin with absolute ethanol for 8 hours, and vacuum-dry spare. The specific surface area of ​​the resin is 721.1m 2 / g, pore volume 0.6274cm 3 / g, pore size distribution 1~9.0nm, average pore size 3.88nm.

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Abstract

The invention discloses a cross-linking agent modified XAD-4 resin, which is a mesoporous resin containing rich micropores and prepared from a cross-linking agent and an XAD-4 resin through Friedel-Crafts reaction, wherein the pore diameters of the mesoporous resin are distributed between 1 to 9.5 nm, the average pore diameter is 2.58-4 nm, the specific surface area is 721-1284 m<2> / g, and the pore volume is 0.67-1.1 cm<3> / g. The method for preparing the cross-linking agent modified XAD-4 resin comprises the following step of carrying out the Friedel-Crafts reaction between the cross-linking agent and the XAD-4 resin to prepare the modified XAD-4 resin, wherein the dosage of the cross-linking agent is 50-100% of the quantity of the XAD-4 resin material. The adsorbent has the characteristics of large specific surface area, narrow pore diameter distribution and easily controllable porous structure, and is obviously superior to the XAD-4 resin in the adsorption capability to nonpolar and weakly polar materials; and therefore, the adsorbent is wide in application prospect in fields of treating and recycling phenols wastewater and the like.

Description

technical field [0001] The invention relates to a crosslinking agent modified XAD-4 resin and a preparation method thereof, belonging to the field of polymer adsorption materials. Background technique [0002] XAD-4 resin is considered to be a typical representative of the second-generation adsorption resin, developed and produced by Rohm and Haas. It has structural features such as high specific surface area, large pore volume, and good mechanical strength. These excellent structural features endow it with good adsorption capacity for non-polar and weakly polar substances (benzene, phenol, etc.), Therefore, XAD-4 resin has important application value in the treatment and recycling of non-polar and weakly polar aromatic compounds, surfactants, drugs, phenols and pesticides. [0003] However, on the one hand, because the skeleton of XAD-4 resin is polystyrene with strong hydrophobicity, its strong hydrophobicity makes it need to be pretreated with polar reagents (such as: me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/06C08J3/24C08K5/03B01J20/26B01J20/30
Inventor 黄健涵查宏伟杨丽邓曙光刘又年
Owner CENT SOUTH UNIV
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