Preliminary Study on the Characterization and Preparation of Quaternary Ammonium Membrane

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• 作者：Ho-Shing Wu and Yu-Kai Wu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2005
• 出版时间：March 16, 2005
• 年：2005
• 卷：44
• 期：6
• 页码：1757 - 1763
• 全文大小：187K
• 年卷期：v.44,no.6(March 16, 2005)
• ISSN：1520-5045

文摘

Four kinds of anion exchange membranes were prepared by polymerizing the chloromethylstyrene cross-linking reagent of divinylbenzene with a coating on polypropylene nonwoven fabricusing the paste method, and then immobilized with trimethyl (triethyl, tripropyl, or tributyl)amine in the quaternarization process. The properties of these membranes were characterizedin terms of thickness, ion-exchange capacity, imbibed water content, and degree of swelling.The kinetics of allylation of phenol was investigated in the organic and alkali aqueous solutionsin the vertical and horizontal membrane reactors. The operating conditions, such as agitationrate, reaction temperature, immobilization temperature, seven kinds of catalysts (four lab-produced and two commercial membranes, one resin), and concentration ratio of reactants wereconducted to achieve the optimum condition. The methylamine membrane as a phase-transfercatalyst was the best choice catalyst for the higher yield of allyl phenyl ether among sixammonium membranes. However, the butylamine membrane showed the best reactivity amongthe six membranes.