Estimation of mid‐distillates production rate in a low temperature Fischer–Tropsch process

Adl, Adel; Ebrahim, H. Ale; Sohrabi, Morteza

doi:10.1002/jctb.2685

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…[12] Them ost common mathematical model to predict the behavior of slurry bubblec olumn reactors is the axial dispersion model. [13][14][15][16] However, this model neglects the radial velocity profile (and thus the radial concentration profile) in the reactor. Them odel may be divided into single-bubble and two-bubble cases.T he bubble phase in the latter case consists of large and small bubbles.S everal experimental studies in large-scale reactors stated the presence of liquid recirculation close to the reactor wall, which may bring down some small bubbles.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Direct Dimethyl Ether Synthesis in a Slurry Reactor by Recirculation and Axial Dispersion Models

Ghorbaei

Ebrahim

2015

Energy Tech

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Dimethyl ether is an environmentally friendly alternative to diesel fuel. This fuel can be produced directly from synthesis gas in a slurry bubble column reactor. We predicted the performance of the slurry bubble column reactor for dimethyl ether synthesis using a recirculation model and comparison with axial dispersion results. The differential equations of recirculation and axial dispersion models for the dimethyl ether synthesis are solved for a similar kinetic equation. A comparison of the results with experimental data from the literature confirms that the recirculation model better represents the reactor behavior. Finally, the effects of operating variables are studied using a simulation framework.

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Section: Introductionmentioning

confidence: 99%

Simulation of Direct Dimethyl Ether Synthesis in a Slurry Reactor by Recirculation and Axial Dispersion Models

Ghorbaei

Ebrahim

2015

Energy Tech

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Fischer–Tropsch reaction–diffusion in a cobalt catalyst particle: aspects of activity and selectivity for a variable chain growth probability

Vervloet

Kapteijn

Nijenhuis

et al. 2012

Catal. Sci. Technol.

119

172

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The reaction-diffusion performance for the Fischer-Tropsch reaction in a single cobalt catalyst particle is analysed, comprising the Langmuir-Hinshelwood rate expression proposed by Yates and Satterfield and a variable chain growth parameter a, dependent on temperature and syngas composition (H 2 /CO ratio). The goal is to explore regions of favourable operating conditions for maximized C 5+ productivity from the perspective of intra-particle diffusion limitations, which strongly affect the selectivity and activity. The results demonstrate the deteriorating effect of an increasing H 2 /CO ratio profile towards the centre of the catalyst particle on the local chain growth probability, arising from intrinsically unbalanced diffusivities and consumption ratios of H 2 and CO. The C 5+ space time yield, a combination of catalyst activity and selectivity, can be increased with a factor 3 (small catalyst particle, d cat = 50 mm) to 10 (large catalyst particle, d cat = 2.0 mm) by lowering the bulk H 2 /CO ratio from 2 to 1, and increasing temperature from 500 K to 530 K. For further maximization of the C 5+ space time yield under these conditions (H 2 /CO = 1, T = 530 K) it seems more effective to focus catalyst development on improving the activity rather than selectivity. Furthermore, directions for optimal reactor operation conditions are indicated.

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Estimation of mid‐distillates production rate in a low temperature Fischer–Tropsch process

Abstract: BACKGROUND: The Fischer-Tropsch process is the most important path for converting natural gas to high quality liquid hydrocarbons. Low temperature Fischer-Tropsch synthesis in slurry bubble column reactors with cobalt-based catalysts is used for mid-distillates production.

Cited by 2 publications

References 27 publications

Simulation of Direct Dimethyl Ether Synthesis in a Slurry Reactor by Recirculation and Axial Dispersion Models

Simulation of Direct Dimethyl Ether Synthesis in a Slurry Reactor by Recirculation and Axial Dispersion Models

Fischer–Tropsch reaction–diffusion in a cobalt catalyst particle: aspects of activity and selectivity for a variable chain growth probability

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