Dimerization of Isobutylene Over Ion Exchange Resin Catalyst in Liquid Phase Continuous Stirred Reactor

Abstract

Dimerization of isobutylene is an important catalytic process for the production of high-value intermediates used in fuel additives, lubricants, and petrochemical manufacturing. The present study investigates the liquid-phase dimerization of isobutylene over ion exchange resin catalysts in a continuous stirred reactor under controlled operating conditions. The research focuses on evaluating catalytic activity, conversion efficiency, product selectivity, reaction kinetics, and operational stability associated with ion exchange resin catalytic systems. Experimental analysis was conducted to examine the influence of reaction temperature, pressure, catalyst loading, residence time, agitation intensity, and feed composition on isobutylene conversion and dimer product distribution. Results demonstrate that ion exchange resin catalysts effectively promote acid-catalyzed dimerization reactions, resulting in enhanced formation of diisobutylene products with high selectivity under moderate operating conditions. The study further reveals that optimized catalyst concentration and reactor operating parameters significantly improve conversion efficiency while minimizing oligomerization side reactions and catalyst deactivation. Increased mixing intensity and controlled residence time contributed to improved mass transfer and stable reaction performance within the continuous stirred reactor system. Catalyst characterization and repeated operational analysis indicated favorable mechanical stability and sustained catalytic activity during prolonged continuous processing. Comparative assessment with conventional homogeneous acid catalysis confirms the advantages of ion exchange resin systems, including simplified product separation, lower corrosion risk, and reduced environmental impact.