Kinetic modelling of the liquid-phase dimerization of isoamylenes on Amberlyst 35

• Published in: Reactive & functional polymers Vol. 67; no. 3; pp. 210 - 224
• Main Authors: Cruz, V.J., Izquierdo, J.F., Cunill, F., Tejero, J., Iborra, M., Fité, C., Bringué, R.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.2007; Elsevier Science
• Subjects: Applied sciences; Diisoamylenes; Dimerization; Ethanol; Exact sciences and technology; Exchange resins and membranes; Forms of application and semi-finished materials; Ion-exchange resin; Isoamylenes; Kinetics; Polymer industry, paints, wood; Technology of polymers; Diisoamylenes; Kinetics; Ethanol; Isoamylenes; Dimerization; Ion-exchange resin; Cationic resin; Catalyst selectivity; Acid catalysis; Experimental study; Modeling; Chemical reaction kinetics; Heterogeneous catalysis; Kinetic model; Alkene; Styrenesulfonate copolymer; Polymeric catalyst; Liquid solid reaction; Catalyst activity; Activation energy
• ISSN: 1381-5148
• DOI: 10.1016/j.reactfunctpolym.2006.11.003

Selectivity, conversion, yield and kinetics of the liquid-phase dimerization of 2-methyl-1-butene and 2-methyl-2-butene mixture have been studied in a batch stirred tank reactor in the temperature range 60–100 °C catalysed by the acid resin Amberlyst 35 and using ethanol as a selectivity enhancer. Selectivity to dimers showed a maximum at R IA/EtOH = 20. Obtained diisoamylenes consisted mainly of 3,4,4,5-tetramethyl-2-hexene, 2,3,4,4-tetramethyl-1-hexene and 3,4,5,5-tetramethyl-2-hexene. LHHW type kinetic model was derived for the dimerization reaction as a whole. The kinetic model assumes that three active sites take part in the rate-limiting step of dimerization; the apparent activation energy for the dimerization reaction being 65 kJ mol −1. A pseudohomogeneous kinetic model was used to describe the dimerization reaction network. The apparent activation energy for each dimerization reaction was found to be in the range 61–81 kJ mol −1.