3 years ago

Multiscale and Multiphase Model of Fixed Bed Reactors for Fischer–Tropsch Synthesis: Intensification Possibilities Study

Multiscale and Multiphase Model of Fixed Bed Reactors for Fischer–Tropsch Synthesis: Intensification Possibilities Study
Nikola M. Nikačević, Vladimir Dikić, Dragomir B. Bukur, Marko Stamenić, Miloš Mandić, Branislav Todić
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.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02467

DOI: 10.1021/acs.iecr.7b02467

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