A kind of preparation method of spherical cyclodextrin resin particles

A technology of resin particles and cyclodextrin, which is applied in the field of preparation of cyclodextrin resin particles, can solve the problem of low selectivity of phenol

Inactive Publication Date: 2011-12-14
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of material has several benefits that make it better than previous materials for removing harmful substances from liquids like wastewater or industrial effluents. It also allows tiny organic compounds called phenylenes (phenols) to be easily removed without losing their effectiveness over time.

Problems solved by technology

In this patented technical problem addressed in this patent relates to separating and recovering specific types of organics (phenoles) dissolved in aquatic environments containing various contaminants including nitrobenzenes, formaldehydes, tannanes, pyridines, ammoniacal bases, etc., which makes them difficult to separate effectively because they lack sufficient polarizable functionalities needed for efficient binding within their structures.

Method used

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  • A kind of preparation method of spherical cyclodextrin resin particles
  • A kind of preparation method of spherical cyclodextrin resin particles
  • A kind of preparation method of spherical cyclodextrin resin particles

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1 Synthesis of spherical α-cyclodextrin resin particles

[0028] Add 14.5 grams of α-cyclodextrin, 7.5 milligrams of sodium borohydride (potassium borohydride or potassium aluminum hydride) and 18.9 milliliters of water into a 500-ml three-neck flask, stir for a while to make the cyclodextrin into a slurry shape, slowly add 18.0 grams of epichlorohydrin (diisocyanate or 1,3-bis(azidomethyl)benzene) and stir for a period of time, then add 16.2 milliliters of sodium hydroxide aqueous solution (40wt%) dropwise to in the mixture. After dripping, stir again for 20 minutes, finally add 250 milliliters of liquid paraffin (or cyclohexane), and react for 20 hours. During the reaction, the stirring speed of mechanical stirring is controlled at 200 revolutions per minute, and the temperature is controlled at 35° C. After the reaction, the cyclodextrin resin particles were filtered out, washed with water and ethanol, filtered, and finally dried at 60°C to obtain the α-cycl...

Embodiment 2

[0029] Example 2 Synthesis of spherical β-cyclodextrin resin particles

[0030] Add 14.5 grams of β-cyclodextrin, 7.5 milligrams of sodium borohydride and 14.5 milliliters of water into a 500 milliliter three-neck flask, stir for a while to make the cyclodextrin into a slurry, and slowly add 20.2 grams of epichlorohydrin After stirring for a while, 16.2 ml of aqueous sodium hydroxide solution (40 wt %) was added dropwise to the mixture. After dripping, stir again 20 minutes, add the liquid paraffin of 250 milliliters at last, react 20 hours, the stirring speed of mechanical stirring during reaction is controlled at 200 revs per minute, and temperature is controlled at 35 ℃. After the reaction, the cyclodextrin resin particles were filtered out, then washed with water and ethanol, filtered, and finally dried at 60°C to obtain the β-cyclodextrin resin, whose electron micrograph is as follows: figure 2 shown.

Embodiment 3

[0031] Example 3 Synthesis of spherical γ-cyclodextrin resin particles

[0032] Add 14.5 grams of γ-cyclodextrin, 7.5 mg of sodium borohydride and 21.8 ml of water into a 500 ml three-neck flask, stir for a while to make the cyclodextrin into a slurry, and slowly add 20.8 grams of epichlorohydrin After stirring for a while, 16.2 ml of aqueous sodium hydroxide solution (40 wt %) was added dropwise to the mixture. After dripping, stir again 20 minutes, add 250 milliliters of liquid paraffin at last, react 20 hours, the stirring speed of mechanical stirring during reaction is controlled at 200 revs per minute, and temperature is controlled at 35 ℃. After the reaction is over, the cyclodextrin resin particles are filtered out, washed with water and ethanol, filtered, and finally dried at 60°C to obtain the γ-cyclodextrin resin, whose electron micrograph is as follows: image 3 shown.

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Abstract

The invention discloses a method for preparing uniform spherical cyclodextrin resin particles by reversed phase suspension polymerization and application thereof. The method takes alpha, beta and gamma cyclodextrin as the raw material respectively and adopts chloropropylene oxide etc. as the cross-linking agent. In an oil dispersion medium and with the effect of a catalyst, three kinds of uniformspherical cyclodextrin resin particles can be obtained respectively by means of reversed phase suspension polymerization. By controlling the reaction temperature, the proportioning of cyclodextrin and other components, the catalyst amount and the reaction time and other reaction conditions, the cyclodextrin content in the cyclodextrin resin and the particle appearance and size can be controlled. The cyclodextrin resin of the invention can be widely used in preferential adsorption and recovery of harmful substances in water like phenol.

Description

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Claims

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Application Information

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Owner EAST CHINA UNIV OF SCI & TECH
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