“…Since the TBA dehydration studies indicate that a mass transport limitation does not exist when macroporous ion-exchange resins are used as a catalyst, a dynamic equilibrium stage model considering mass and energy balances , is applied to simulate the column. In the model, the solid catalyst is treated as quasi-homogeneous with the liquid phase, i.e., the same liquid composition exists at the catalytically active site as in the bulk liquid composition.…”
Section: Column Mathematical Model and Solution Methodsmentioning
The feasibility of tert-butyl alcohol (TBA) dehydration to selectively produce the high purity products isobutene or diisobutene by using reactive distillation has been illustrated through process simulations. Correspondingly, different column configurations are proposed. The influence of the important operating parameters on the column performance is analyzed by continuation methods, and the operating windows of the parameters are suggested. Advantages of employing reactive distillation for TBA dehydration include the mild conditions required, high TBA conversion per pass, and high selectivity of the desired products. Moreover, the excellent coupling of TBA hydration and isobutene dimerization in one column leads this system to be a good example for studying the complex behaviors of reactive distillation integrating multiple chemical reactions.
“…Since the TBA dehydration studies indicate that a mass transport limitation does not exist when macroporous ion-exchange resins are used as a catalyst, a dynamic equilibrium stage model considering mass and energy balances , is applied to simulate the column. In the model, the solid catalyst is treated as quasi-homogeneous with the liquid phase, i.e., the same liquid composition exists at the catalytically active site as in the bulk liquid composition.…”
Section: Column Mathematical Model and Solution Methodsmentioning
The feasibility of tert-butyl alcohol (TBA) dehydration to selectively produce the high purity products isobutene or diisobutene by using reactive distillation has been illustrated through process simulations. Correspondingly, different column configurations are proposed. The influence of the important operating parameters on the column performance is analyzed by continuation methods, and the operating windows of the parameters are suggested. Advantages of employing reactive distillation for TBA dehydration include the mild conditions required, high TBA conversion per pass, and high selectivity of the desired products. Moreover, the excellent coupling of TBA hydration and isobutene dimerization in one column leads this system to be a good example for studying the complex behaviors of reactive distillation integrating multiple chemical reactions.
“…It is readily understood that a relatively high distribution of MTBE is now formed in the common section between the reactive section and the rectifying section, hence facilitating the forward reaction and reducing the possibility of isobutylene dimerization simultaneously in the top part of the reactive section. Recently, Qi et al also reported a very similar configuration for an MTBE decomposition reactive distillation column. 4 Profiles of net reaction rates in the MTBE decomposition reactive distillation column. 5 Resultant process design, 8(5)/6(4)/5, obtained by seeking further internal heat integration. 6 Profiles of temperature, liquid and vapor flow rates, and liquid composition for the resultant process design, 8(5)/6(4)/5.…”
Section: Synthesis and Design Of The Mtbe Decomposition
Reactive Dist...mentioning
The synthesis, design, and control of a reactive distillation column for decomposing methyl tertiary butyl ether into isobutylene and methanol are reported in this work. Because the reaction is highly endothermic, it is advantageous to consider cautiously internal heat integration between the reaction and separation operations during process synthesis the and design, thereby necessitating deliberate determination of the feed location and judicious distribution of reactive section along the height of the process (Huang et al. AIChE J. 2006, 52, 2518. Through extensive comparison with a simple process design in which the reactive section is located between the rectifying section and the stripping section, it is demonstrated that a substantial reduction of capital investment and energy consumption can be achieved with this strategy of process development. Process dynamics and operation of the resultant process design were further investigated, and a noticeable improvement was gained in process controllability. The major reason for this improvement can be attributed to the fact that a more synergistic relationship has been evolved between the reaction and separation operations in the pursuit of further internal heat integration during process synthesis and design.
“…For the acid catalyzed reaction, the traditional reactor-followed-by-distillation concept is particularly complex since the ternary mixture leaving the reactor forms two minimum boiling binary azeotropes. The utilization of single pressure reactive distillation on the MTBE production has been studied by several authors, ,− and the obtained results from this technology are shown to be close to 100% conversion. However, it is also known that the MTBE minimum boiling azeotropes are pressure-dependent, and that reaction constants are dependent on the temperature of the mixture, defined by its pressure.…”
Section: Case Study: Mtbe Production
Through Dual-pressure
Reactive D...mentioning
The Infinite Dimensional
State-Space (IDEAS) conceptual framework
is put forward as an intensification tool for the synthesis of globally
optimal, multipressure, reactive, azeotropic, distillation networks.
To this end, a unit operation model is proposed for reactive vapor–liquid
equilibrium flash separators employed as network building blocks,
and the concepts of reactive holdup and capacity are introduced as
network performance metrics. The method is demonstrated on a case
study involving MTBE production using multipressure reactive distillation
of methanol/isobutene/MTBE azeotropic mixtures. The globally optimal
solutions for the minimum total reactive holdup, minimum total flow,
and minimum capacity problems are obtained for a dual-pressure reactive
distillation process operating simultaneously at 1.0 and 5.0 atm.
For the problem of minimum capacity, the global optimum is found to
have both reaction and pressure swing features, indicating those are
complementary rather than competing technologies for process intensification
purposes.
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