Performance of the polymer-and oxide-supported triphase catalysts and effect of ultrasound on their stabilites

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Title:	Performance of the polymer-and oxide-supported triphase catalysts and effect of ultrasound on their stabilites
Authors:	Ching, Hsieh-Ting Weng, Hung-Shan Hsiao, Hsu-Chin 蕭旭欽 (東方技術學院化工與材料工程系)
Contributors:	東方技術學院化工與材料工程系
Keywords:	Phase-transfer catalyst Polyner-supported catlyst Oxide-supported catalyst Liquid-liquid-solid phase-tarnsfer catalysis Allyl phenyl ether Ultrasound
Date:	2008-09
Issue Date:	2012-10-25 13:56:38 (UTC+8)
Publisher:	台北市： the Taiwan institute of chemical engineers
Abstract:	In this study, several trialkylamines were immobilized on chloromethylated polystyrene (CMPS), silica gel, and alumina to prepare triphase catalysts for catalyzing the etherification reaction of allyl bromide (the organic reactant) and sodium phenolate (the aqueous reactant). The reactor was agitated mechanically or with the aid of ultrasonic vibration. Performances of the prepared catalysts were compared, and the effect of imposing ultrasound was investigated based on the activity, selectivity, and stability of the catalyst. Experimental results show that tri-n-propylamine is the best active species when CMPS is used as the support, while tri-n-butylamine is the best when SiO2 and Al2O3 are employed as the supports. The CMPS-supported catalyst is far better than the SiO2- and Al2O3-supported catalysts in activity and selectivity but not in stability. Imposing the ultrasound can effectively increase the reaction rate. Mechanical agitation at a low speed with the imposition of ultrasonic vibration not only results in a conversion slightly higher than the case with a high mechanical agitation speed without ultrasonic vibration, but also gives a constant stability for the CMPS-supported catalyst.
Relation:	Journal of the Chinese Institute of Chemical Engineers, Vol.39 no.5, pp.449-455 中國化學工程學會會誌
Appears in Collections:	[Department of Chemical and Materials Engineering] journal

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