Thermodynamics and Kinetics of the Dehydration of tert-Butyl Alcohol

Abstract

The dehydration of tert-butyl alcohol to water and isobutene was studied using an ion-exchange resin catalyst at temperatures between 60 and 90 °C. A temperature-dependent equilibrium constant for the dehydration reaction was obtained that gave a reaction enthalpy of 26 kJ mol -1 , in good agreement with values in the literature. Measured data were used for kinetic modeling of the reaction. The best model with physically meaningful parameters was of Langmuir-Hinshelwood type where isobutene does not adsorb on the catalyst. The activation energy for the reaction in this case was 18 kJ mol -1 .

Alkenes oligomerization with resin catalysts

“…Adsorption of dimers and trimers was found negligible in relation to the adsorption of isobutene and TBA (selectivity enhancer) [96]. The kinetic model, available thermodynamic data [97] and modified UNIFAC activity coefficients [91] were combined in a two-dimensional pseudohomogeneous fixed bed reactor model that describes the mini-plant tubular reactors [98,99]. Model validation was confirmed by the good correlation between experimental data and simulation results (isobutene conversion, diisobutene selectivity and the maximum temperature in the reactor) [91,95,96].…”

Advances in Organic Liquid‐Gas Chemical Heat Pumps

“…Riousx and Vannice [45] carried out an experimental investigation on vapor-phase isopropyl alcohol (IPA) dehydrogena- [47] has presented an excellent review on acetone hydrogenation under different conditions with various homogeneous and heterogeneous catalysts, and some new strategies to develop economic and environmentally benign approaches for acetone hydrogenation were also proposed. For the dehydration reaction of tert-butyl alcohol, catalysts such as ion-exchange resin, solid acid, and Amberlyst-15 can be applied [19,[48][49][50][51]. Honkela et al [50] studied the dehydration of tert-butyl alcohol to isobutylene by using an ionexchange resin catalyst in the temperature range of 333-363 K and obtained a temperature-dependent equilibrium constant for the dehydration reaction.…”

“…For the dehydration reaction of tert-butyl alcohol, catalysts such as ion-exchange resin, solid acid, and Amberlyst-15 can be applied [19,[48][49][50][51]. Honkela et al [50] studied the dehydration of tert-butyl alcohol to isobutylene by using an ionexchange resin catalyst in the temperature range of 333-363 K and obtained a temperature-dependent equilibrium constant for the dehydration reaction. In addition, they found that the best model with physically meaningful parameters was of the Langmuir-Hinshelwood type in which isobutene does not adsorb on the catalyst.…”

“…The conclusion was restated by Zhao et al [19] through their experimental investigation and theoretical simulation. Due to the importance of reactive distillation in an organic CHP, more and more attention has been paid to the reactive distillation process of tert-butanol, including rectifying process analysis, thermodynamic and kinetic analysis, experimental investigation, modeling, and simulation [50,51,[54][55][56][57].…”

“…The performance of an organic CHP can be characterized by such parameters as the upgrading temperature, specific power production, coefficient of performance (COP, i.e., enthalpy www.cet-journal.com [19,[48][49][50] Solid acid Depolymerization of paraldehyde [36], dehydration of tert-butanol [51] efficiency), coefficient of amplification (COA), and exergy efficiency. Definitions and expressions of these parameters are described in [5].…”