Abstract
A study on the Fischer–Tropsch synthesis was investigated employing a one-dimensional non-isothermal model in a fixed-bed reactor over a Co/Al2O3 catalyst. The reaction kinetic follows a semi-empirical approach. Under multiple operating conditions and compared to experimental results, the presented model appropriately describes the product distribution. Afterward, optimizations using single- and multi-objective differential evolution (DE) algorithms were conducted. The minimum CH4 selectivity and maximum CO conversion were obtained, through the single-objective DE optimization. The results indicate that the improvement of one objective is only reached by making reductions to the other objective, i.e., a trade-off between objectives. The optimal operating conditions employing the multi-objective algorithm found GHSV = 4002.17 \({\text{Nml}}\;{\text{g}}_{{{\text{cat}}}}^{ - 1} {\text{h}}^{ - 1}\), H2/CO = 2.7, T = 501.63 K, P = 22.7 bar, and no inert content (%N2 = 0). Conditions that yielded optimized CO conversion and CH4 selectivity, respectively, of 60.21 and 6.65%.
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Abbreviations
- C j :
-
Molar concentration of species j [mol m−3]
- C p :
-
Mixture heat capacity [J Kg−1 K−1]
- d p :
-
Catalyst particle diameter [m]
- d i :
-
Reactor inner diameter [m]
- L :
-
Reactor length [m]
- M m :
-
Average molar mass [g mol−1]
- P :
-
Total pressure [bar]
- R :
-
Universal gas constant [J mol−1 K−1]
- r :
-
H2/CO molar ratio
- r FT :
-
Global Fischer–Tropsch reaction rate [\({\text{mol g}}_{{{\text{cat}}}}^{ - 1} {\text{ s}}^{ - 1}\)]
- r j :
-
Rate of consumption/production of species j [\({\text{mol g}}_{{{\text{cat}}}}^{ - 1} {\text{ s}}^{ - 1}\)]
- r WGS :
-
Water–gas shift reaction rate [\({\text{mol g}}_{{{\text{cat}}}}^{ - 1} {\text{ s}}^{ - 1}\)]
- S Cn :
-
Hydrocarbon selectivity n [%]
- T :
-
Temperature [°C] or [K]
- T w :
-
Reactor inner wall temperature [°C] or [K]
- U :
-
Overall heat transfer coefficient [W m−2 K−1]
- u s :
-
Superficial velocity [m s−1]
- x CO :
-
Carbon monoxide conversion [%
- ASF:
-
Anderson–Shultz–Flory
- BDF:
-
Backward differentiation formula
- CSTR:
-
Continuous stirred tank reactor
- DE:
-
Differential evolution
- FBR:
-
Fluidized bed reactor
- FTS or FT:
-
Fischer–Tropsch synthesis
- GHSV:
-
Gas hourly space velocity [\({\text{Nml g}}_{{{\text{cat}}}}^{ - 1} {\text{ h}}^{ - 1}\)]
- HTFT:
-
High-temperature Fischer–Tropsch
- LTFT:
-
Low-temperature Fischer–Tropsch
- MODE:
-
Multi-objective differential evolution
- PBR:
-
Packed or fixed-bed reactor
- RMSE:
-
Root-mean-square error
- SBR:
-
Slurry bed reactor
- STTR:
-
Straight through transport reactor
- TOPSIS:
-
Technique for order of preference by similarity to ideal solution
- WGS:
-
Water–gas shift
- 0 :
-
Initial condition
- i :
-
Reaction "i"
- j :
-
Chemical species "j"
- n :
-
Carbon number
- α n :
-
Chain growth probability
- ΔH i :
-
Enthalpy of reaction i [KJ mol−1]
- ε :
-
Reactor bed porosity
- θ :
-
Catalysis active sites
- μ m :
-
Mixture viscosity [Pa s]
- ρ b :
-
Catalytic bed density or bulk density [Kg m−3]
- ρ f :
-
Fluid density [Kg m−3
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Acknowledgements
The authors would like to thank the National Council of Scientific and Technological Development of Brazil—CNPq (Grants Number: 307966/2019-4-PQ, 405101/2016-3-Univ), PRONEX ‘Fundação Araucária’ 042/2018 for financial support of this work.
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Leite, V.R., Fontana, É. & Mariani, V.C. Optimization of operating conditions of the Fischer–Tropsch synthesis based on multi-objective differential evolution algorithm. J Braz. Soc. Mech. Sci. Eng. 44, 490 (2022). https://doi.org/10.1007/s40430-022-03785-4
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DOI: https://doi.org/10.1007/s40430-022-03785-4