(372w) Microkinetic Model Reduction for Ethylene Oligomerization Reactor Optimization and Design

Authors: 
Ghosh, K., University of Notre Dame
Dowling, A. W., University of Notre Dame
In recent years, microkinetic modeling has grown in popularity as a means to elucidate surface catalytic reactions [1 – 2]. The molecular-level detail embedded in these mechanisms suggests microkinetic models can facilitate reaction engineering, equipment design, process intensification [4]. However, despite their great promise, microkinetic models of catalytic processes have yet to play a major role in industrial reactor modeling and scale-up [5]. This absence of impact is, in part, due to inherent difficulty of developing kinetic schemes, determining model parameters, validating resulting kinetic models, and integrating the key features into high-order reactor models. Reactor engineering and design is fundamentally a multiscale challenge [6]. Reactions occur at the active catalyst sites and are influenced by the particle temperature and species partial pressures which are influenced by the transport and flow patterns in the reactor. Therefore, multiscale modeling of chemical reactors is essential for improved understanding, design and scale-up.

Bottom-up multiscale modeling strategies are predominantly used to predict reactor behavior from microscopic scale calculations [7]. This approach naturally leads to unprecedented accuracy in process design, control, and optimization. It departs significantly from the empirical process design and control strategies of the past, whereby fitting to experimental data was essential to model building. Current efforts are focused on either the molecular scale aspects of microkinetic model development or the process scale aspects including material design for catalysts and reactor design

In this work, we explore the importance of microkinetic model reduction in providing bottom-up and top-down systems analysis for novel shale gas processing technologies. This work is part of the collaborative NSF Center for Innovative and Strategic Transformation of Alkane Resource (CISTAR). We seek to establish strong feedback loops between catalysis, separations, and systems engineering researchers by extracting kinetic insights, and setting reactor-scale selectivity, conversion, and operating condition targets. This poster presents a detailed review of multiscale modeling paradigms for reactor engineering. We then explore application to oligomerization reactor design as part of a modular gas-to-liquids system. We are developing multi-scale optimization frameworks for detailed reactor optimization and intensification that leverages microkinetic modeling [8], process synthesis [9], and systems analysis [10] with CISTAR collaborators to systematically help guide catalyst research and development.

References

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