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Multiscale and Multiphase Model of Fixed Bed Reactors for Fischer–Tropsch Synthesis: Intensification Possibilities Study
- Marko Stamenić
- ,
- Vladimir Dikić
- ,
- Miloš Mandić
- ,
- Branislav Todić
- ,
- Dragomir B. Bukur
- , and
- Nikola M. Nikačević
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† Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade 11000, Serbia
‡ Chemical Engineering Program, Texas A&M University at Qatar, P.O. Box 23874, Doha, Qatar
§ Artie McFerrin Department of Chemical Engineering, Texas A&M University, MS 3122, College Station, Texas 77843-3122, United States
*E-mail: [email protected]. Tel.: +381113303652.
Abstract
A multiphase fixed-bed reactor (FBR) model for Fischer–Tropsch Synthesis has been developed. A high level of details is considered for description of the phenomena on the reactor and particle scale. Detailed kinetics is used, with parameters estimated from experiments with a cobalt-based catalyst. Model robustness has been validated using literature data. Performance analysis was made for a conventional scale FBR with egg-shell distribution of catalyst and a millimeter-scale FBR with small particles and uniform distribution. In both cases, diffusion limitations are almost eliminated due to use of small diffusion lengths. For similar qualitative results, a milli-scaled design would result in a significantly lower reactor volume, but the capital costs could be high due to large wall area and a vast number of tubes. Heat removal is efficient in both cases, and pressure drop in the milli-scale reactor is low due to the use of a shorter bed and lower velocity.
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