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Optimal design of catalyticdistillationfor alkylation of isobutane with 2-buteneon a solid catalyst

corresponding

D.A. Sladkovskiy1, N.V. Kuzichkin1, K.V. Semikin1, P.A. Zernov1, D.Yu. Murzin*1,2

*Corresponding author

1. St.Peteresburg State
 
Optimal design of catalytic
distillation
for alkylation of isobutane with 2-butene
on a solid catalyst
Technological Institute, St.Petersburg, Russia

2. Åbo Akademi University, Turku, Finland

Abstract

Alkylation of isobutane with butenes is one of the most important processes making high octane number gasoline. Highly exothermicity requires efficient heat removal. Low temperature implies application of strong (sulphuric and hydrofluoric) acids as catalysts albeit inherent corrosion, pollution and safety problems. The difficulty in applying alternative solid alkylation catalysts is related to deactivation by coking. In order to minimize deactivation an excess of olefin is required. Catalytic distillation, combining reaction and separation, could be proposed to considerably reduce the isobutane recycle and simultaneously to ensure high butenes conversion. Detailed simulations for reactive distillation in a zeolite catalysed alkylation of isobutane with butane were conducted. Various options regarding placement of the reaction section were considered and optimal conditions determined


INTRODUCTION

Alkylation of isobutane with butenes can be considered as one of the most important processing for obtaining high octane number gasoline. Alkylate, which is the desired product of this process, has a lower vapour pressure and is free from presence of sulphur, nitrogen and aromatic compounds. At the moment the share of alkylates in high octane number gasoline in developed countries approaches 13% (1, 2).