Selectivity effects on series reactions by reactant storage and PSA operation

The concept of adsorptive reactors has attracted considerable attention as a hybrid process to enhance reaction selectivity and conversion for heterogeneously catalyzed gas-phase reactions. The performance of adsorptive reactors may be enhanced by the nonuniform distribution of catalyst and adsorbent particles within the reactor and general guidelines for determining a suitable distribution are provided in this article. Simulation and optimization studies have been carried out using Claus process and its parametric variants as test cases. The study indicates the conditions under which a nonuniform distribution of catalyst and adsorbent is favorable for adsorptive reactor performance. It also shows that a nonuniform distribution is not always essential for the optimal adsorptive reactor performance and that under certain conditions a simple homogeneous distribution may well suffice.

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“…dehydrogenation of methylcyclohexane clay-based adsorbents Alpay et al A + D → B + D → C desorption of reactant D Kodde et al …”

Section: Introductionmentioning

confidence: 99%

Optimal Distribution of Catalyst and Adsorbent in an Adsorptive Reactor at the Reactor Level

Lawrence

Grünewald

Dietrich

et al. 2006

Ind. Eng. Chem. Res.

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“…The integration was carried out using the gPROMS environment in the form of a second-order upwind scheme .…”

Section: Introductionmentioning

confidence: 99%

Two-Step Catalytic Oxidative Dehydrogenation of Propane: An Alternative Route to Propene

Graaf

Zwanenburg

Rothenberg

et al. 2005

Org. Process Res. Dev.

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The use of solid oxygen carriers (SOCs) in catalytic dehydrogenation may provide a more efficient production process for small alkenes by shifting the equilibrium to the product side. In this paper we use dynamic simulations to investigate the feasibility of two-step oxidative dehydrogenation of propane to propene using a SOC. The proposed process is carried out in a cyclically operated fixed-bed reactor, filled with a mixture of a dehydrogenation catalyst and a SOC. In the first step (the dehydrogenation), propane is fed to the reactor. The SOC oxidises the hydrogen produced during the dehydrogenation. In the second step, the SOC is regenerated and the accumulated coke burned off by allowing oxygen into the reactor. We determine the cyclic steady states by simulating the process for different feed temperatures and SOC concentrations, and we show that addition of a SOC to a reactor filled with dehydrogenation catalyst increases the conversion of propane and enhances the selectivity towards propene.

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2005

Cyclic Separating Reactors

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Selectivity effects on series reactions by reactant storage and PSA operation

Abstract: This work e®aluates adsorpti®e reactors used to impro®e the operation of a sequential

Cited by 6 publications

References 20 publications

Optimal Distribution of Catalyst and Adsorbent in an Adsorptive Reactor at the Reactor Level

Optimal Distribution of Catalyst and Adsorbent in an Adsorptive Reactor at the Reactor Level

Two-Step Catalytic Oxidative Dehydrogenation of Propane: An Alternative Route to Propene

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