caa a22 4500 606173625 CHVBK 20210128100734.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s11244-015-0460-3 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0460-3 Catalytic Activity and Accessibility of Acidic Ion-Exchange Resins in Liquid Phase Etherification Reactions [Elektronische Daten] [J. Badia, C. Fité, R. Bringué, M. Iborra, F. Cunill] Although macroreticular acidic ion-exchange resins have been widely used as catalysts in the industrial world for decades, their catalytic behavior is still far from being completely understood at a molecular level. Several characterization techniques coexist, which provide information about their properties. Only few of these techniques give an actual picture of their working-state features when swollen in anhydrous polar reactive media such as in etherification processes, where they are extensively used. The inverse steric exclusion chromatography technique, based on modeling the micropores structure, or gel-phase, as a set of discrete volume fractions with a characteristic polymer chain density, constitutes an appropriate procedure to assess the morphology of ion-exchangers in the swollen state. Present work proposes an empirical model to correlate the properties of the volume fractions with their catalytic activity in the etherification reaction rates of isobutene by addition of C1-C4 linear primary alcohols. Sixteen different macroreticular acidic ion-exchange catalysts, both commercial and lab-made, have been used, which differ in acid capacity, sulfonation type, cross-linking degree and swollen-phase volume fractions distribution. Experimental reaction rates have been expressed as a sum of contributions of each individual volume fraction. The contribution of each polymer volume fraction corresponds to the product of the catalyst acidity, the characteristic volume fraction within the gel-phase of the catalyst, and a specific turnover frequency of that fraction. Accessibility of the reacting alcohol, expressed in terms of the Ogston coefficient, has been also included in the empirical dependency equation presented in this work. Springer Science+Business Media New York, 2015 Macroreticular cationic ion-exchange catalysts nationallicence Gel-phase nationallicence Etherification nationallicence Badia J. Chemical Engineering Department, Faculty of Chemistry, University of Barcelona, C/Martí i Franquès 1-11, 08028, Barcelona, Spain aut Fité C. Chemical Engineering Department, Faculty of Chemistry, University of Barcelona, C/Martí i Franquès 1-11, 08028, Barcelona, Spain aut Bringué R. Chemical Engineering Department, Faculty of Chemistry, University of Barcelona, C/Martí i Franquès 1-11, 08028, Barcelona, Spain aut Iborra M. Chemical Engineering Department, Faculty of Chemistry, University of Barcelona, C/Martí i Franquès 1-11, 08028, Barcelona, Spain aut Cunill F. Chemical Engineering Department, Faculty of Chemistry, University of Barcelona, C/Martí i Franquès 1-11, 08028, Barcelona, Spain aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 919-932 1022-5528 58:14-17<919 2015 58 11244 https://doi.org/10.1007/s11244-015-0460-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0460-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Badia J. Chemical Engineering Department, Faculty of Chemistry, University of Barcelona, C/Martí i Franquès 1-11, 08028, Barcelona, Spain aut NATIONALLICENCE 700 1- Fité C. Chemical Engineering Department, Faculty of Chemistry, University of Barcelona, C/Martí i Franquès 1-11, 08028, Barcelona, Spain aut NATIONALLICENCE 700 1- Bringué R. Chemical Engineering Department, Faculty of Chemistry, University of Barcelona, C/Martí i Franquès 1-11, 08028, Barcelona, Spain aut NATIONALLICENCE 700 1- Iborra M. Chemical Engineering Department, Faculty of Chemistry, University of Barcelona, C/Martí i Franquès 1-11, 08028, Barcelona, Spain aut NATIONALLICENCE 700 1- Cunill F. Chemical Engineering Department, Faculty of Chemistry, University of Barcelona, C/Martí i Franquès 1-11, 08028, Barcelona, Spain aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 919-932 1022-5528 58:14-17<919 2015 58 11244