Modeling of a pilot-scale fixed-bed reactor for iron-based Fischer–Tropsch synthesis: Two-dimensional approach for optimal tube diameter

Park, Nonam; Kim, Jeong‐Rang; Yoo, Yong Keun; Lee, Jin-Suk; Park, Myung-June

doi:10.1016/j.fuel.2014.01.044

Cited by 33 publications

(22 citation statements)

References 30 publications

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“…Jess and Kern [18] interpreted the use of fixed bed multitubular reactors meant for FT synthesis over Fe and Co catalysts by using 1D and 2D pseudo-homogeneous models. Jess et al [19] [21]. Wang et al studied the details of kinetic modelling of FT synthesis over an industrial Fe-Cu-K catalyst based on the carbide polymerisation mechanism [22].…”

Section: Introductionmentioning

confidence: 99%

Modelling of a fixed bed reactor for Fischer–Tropsch synthesis of simulated N 2 -rich syngas over Co/SiO 2 : Hydrocarbon production

Moazami

Mahmoudi

Tsolakis

et al. 2015

Fuel

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Section: Introductionmentioning

confidence: 99%

Modelling of a fixed bed reactor for Fischer–Tropsch synthesis of simulated N 2 -rich syngas over Co/SiO 2 : Hydrocarbon production

Moazami

Mahmoudi

Tsolakis

et al. 2015

Fuel

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“…Due to dwindling petroleum reserves and the fluctuations of the crude oil costs in the past few years, Fischer-Tropsch synthesis (FTS) of syngas (CO and H 2 mixtures) has been considered as one of the foremost promising ways to provide ultra-clean fuels at an economically possible cost (Fu et al 2013;Park et al 2014). In FTS, which is a kind of polymerization process, a large range of light gases and distillates, including olefins, paraffins, and oxygenated compounds are produced from synthesis gas in a catalytic reaction (Parnian et al 2014a, b;Liu et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Modeling of liquid hydrocarbon products from syngas

Atashi

Hajisafari

Rezaeian

et al. 2018

Int J Coal Sci Technol

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The modeling of hydrocarbon selectivity and CO conversion of the Fischer-Tropsch synthesis over Fe-Ni/Al 2 O 3 catalyst by using coupled artificial neural networks (ANN) and design of experiment (DOE) approaches were investigated. The variable parameters for modeling consisted of the pressure range between 2 and 10 bar and the temperature range of 523-573 K. After training of data by ANN and determination of DOE points by central composite design (CCD), the results were compiled together for producing simulated data used in the response surface method (RSM). The RSM was used as an applied mathematics model to demonstrate the CO conversion and selectivity of hydrocarbons dependence on the CO hydrogenation conditions. The results indicated that CO conversion and C þ 5 selectivity increased with rising both temperature and pressure. The methane selectivity showed upward trend as the temperature increased. It also increased by decreasing pressure. Finally, the optimization of the catalytic process was carried out and conditions with maximum desired product were obtained. A comparison of experimental values and RSM values show that the RSM equations are able to predict the behavior of experimental data.

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“…By modelling and optimizing the reactor's operation, it is possible in many cases to achieve significantly enhanced throughput; better and more consistent product quality; rising conversion and selectivity; as well as a significant effect on the scaling up of the processes from the laboratory to production scale. Only a few studies [8][9][10][11][12][13][14][15][16][17] are available on the basis of the development of a mathematical model of a fixed bed reactor for FT synthesis.…”

Section: Introductionmentioning

confidence: 99%

Catalytic performance of cobalt–silica catalyst for Fischer–Tropsch synthesis: Effects of reaction rates on efficiency of liquid synthesis

Moazami

Mahmoudi

Rahbar

et al. 2015

Chemical Engineering Science

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A one-dimensional pseudo-homogeneous mathematical model of a fixed bed reactor for Fischer-Tropsch (FT) synthesis was developed for the flow of simulated N 2 -rich syngas over an in-house cobalt-silica catalyst. This study aims at improving the efficiency of FT synthesis by maximizing the liquid productivities and selectivity, as well as maximizing the syngas conversion and minimizing the methane formation. The developed model predicts the fraction of the reactants and products along the reactor bed length. The rate of syngas conversion and the rate of CO 2 , H 2 O, CH 4 , C 2 H 4 , C 2 H 6 , C 3 H 8 , n-C 4 H 10 , i-C 4 H 10 and C 6.05 H 12.36 (C 5+ ) formation were calculated by developing advanced codes in MATLAB. The reaction equations were proposed as a number of lumped chemical reactions (8 reactions, including water gas shift reaction) by means of the molar coefficients of reaction molecules (11 reactive species). The kinetic parameters were estimated by global optimization in MATLAB using the global search method. Optimum values were achieved during the search process. The results predicted by the model were in very good agreement with those measured experimentally at different operating conditions, with respect to conversion and the FT products' selectivity. The rates of production and consumption were derived from a modified power-law rate expression. This study shows that the adapted rate model can deliver a better prediction of final conversion and selectivity. The accuracy of the fitted model relative to the experimental data was determined by a quantitative analysis method using the mean absolute relative residual percentage (MARR %) for the total of 35 data points. It was found that the model based on the modified equation provided a better fit to the experimental data with a MARR of 6.57%, compared to the classic equation with a MARR of 12.24%.The model predicts the influence of reaction rates on the performance of the fixed bed FT reactor using an unpromoted Co/SiO 2 catalyst at 503 K, 15 bar and 6 L g cat -1 h -1 . As a result, the conversions of 91.57 and 97.26% were achieved for CO and H 2 , respectively with the FT C 5+ synthesis reaction rate of 7.81×10 -5 mol g cat -1 s -1 . The higher rate of C 5+ formation was found by increasing FT reaction rates compared to the rate of lighter the hydrocarbons' formation. At the same condition, only 5.04 and 8.91% methane and C 2 -C 4 selectivity respectively, were predicted; while the highest value of 86.05% liquid (C 5+ ) selectivity was obtained in this case. It was concluded that the higher rate of conversion of H 2 inside the pores filled with liquid products, compared to that of CO, caused an increase in the H 2 /CO ratio in the catalyst pores; and thus, a shift towards the formation of lighter hydrocarbons.

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Modeling of a pilot-scale fixed-bed reactor for iron-based Fischer–Tropsch synthesis: Two-dimensional approach for optimal tube diameter

Cited by 33 publications

References 30 publications

Modelling of a fixed bed reactor for Fischer–Tropsch synthesis of simulated N 2 -rich syngas over Co/SiO 2 : Hydrocarbon production

Modelling of a fixed bed reactor for Fischer–Tropsch synthesis of simulated N 2 -rich syngas over Co/SiO 2 : Hydrocarbon production

Modeling of liquid hydrocarbon products from syngas

Catalytic performance of cobalt–silica catalyst for Fischer–Tropsch synthesis: Effects of reaction rates on efficiency of liquid synthesis

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