Olefin Production from Heavy Liquid Hydrocarbon Thermal Cracking: Kinetics and Product Distribution

Document Type : Research Article

Authors

Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box14115-143 Tehran, I.R. IRAN

Abstract

Thermal cracking of a heavy liquid hydrocarbon was performed in a laboratory scale tubular reactor. Central Composite Design (CCD), was used as an experimental design method. The design variables were Coil Outlet Temperature (COT), feed flow and rate steam ratio. Maximum yield of ethylene was 30.37 wt% at COT, residence time and steam ratio of 869oC, 0.208 s and 1.22 g/g, respectively. Maximum yield of propylene was 15.37 wt% at COT, residence time and steam ratio of 825oC, 0.147 s and 0.95 g/g, respectively.  A mechanistic model based on free radical chain reactions was developed using experimental results. Developed reaction network contains 148 reactions for 43 species. Finally, the experimental data were compared with model results. Scatter diagrams showed good agreement between model and experimental data.

Keywords

Main Subjects

References

[1] Pinter A., Tungler A., Nagy L., Vida L., Kovacs I., Kerezsi J., A Laboratory Steam-Cracking Reactor
to Characterize Raw Materials, International Journal of Chemical Reactor Engineering, 2, A15 (2004).
[2] Hirato M., Yoshioka S., Matanuska Thermal Cracking of Gas Oil, Naphtha and Kerosene for Production of Light Olefins, Hitachi Rev, 20, 326 (1971).
[3] Belohlav Z., Zamostny P., Herink T., The Kinetic Model of Thermal Cracking for Olefins Production, Chemical Engineering and Processing, 42, p. 461 (2003).
[4] Ghassabzadeh H., Towfighi Darian J., Zaheri P., Experimental Study and Kinetic Modeling of Kerosene Thermal Cracking, J. Anal. Appl. Pyrolysis, 86, p. 221 (2009).
[5] Depeyre D., Flicoteaux C., Arbabzadeh F., Zabaniotou, A., Modeling of Thermal Steam Cracking of an Atmospheric Gas Oil, Ind. Eng. Chem. Res. 28, p. 967 (1989).
[6] Zahedi S., Towfighi J., Karimzadeh R., Omidkhah M., Determination of Yield Distribution in Olefin Production by Thermal Cracking of Atmospheric Gasoline, Korean J. Chem. Eng., 24, p. 681 (2008).
[7] Keyvanloo K., Towfighi J., Sadrameli S.M., Mohamadalizadeh A., Investigating the Effect of Key Factors, Their Interactions and Optimization of Naphtha Steam Cracking by Statistical Design of Experiments, J. Anal. Appl. Pyrolysis, 87, p. 224 (2010).
[8] Poustma M.L., Fundamental Reactions of Free Radicals Relevant to Pyrolysis Reactions, J. Anal. Appl. Pyrol., 54, p. 5 (2000).
[9] Franz J.A., Camaioni D.M., Autrey T., Linehan J.C., Alnajjar M.S., Measurement of Select Radical Processes in Hydrocarbon Pyrolysis, J. Anal. Appl. Pyrol., 54, p. 37 (2000).
[10] SafarikI., Strausz O.P., The Thermal Decomposition of Hydrocarbons. Part 3. Polycyclic n-Alkylaromatic Compounds, Res. Chem. Intermed., 23, p. 179 (1997).
[11] Sadrameli S.M., Green A.E.S., Systematics and Modeling Representations of Naphtha Thermal Cracking for Olefin Production, J. Anal. Appl. Pyrolysis, 73, p. 305 (2005).
[12] Towfighi J., Niaei A., Karimzadeh R., Saedi G., Systematics and Modelling Representations of LPG Thermal Cracking for Olefin Production, Korean J. Chem. Eng., 23, p. 8 (2006).
[13] Ranzi E., Dente M., Goldaniga A., Bozzano G., Faravelli T., Lumping Procedures in Detailed Kinetic Modeling of Gasification, Pyrolysis, Partial Oxidation and Combustion of Hydrocarbon Mixtures, Progress in Energy and Combustion Science, 27, p. 99 (2001).
[14] Sundaram K.M., Froment G., Modeling of Thermal Cracking Kinetics. 3. Radical Mechanisms for the Pyrolysis of Simple Paraffins, Olefins, and Their Mixtures, Ind. Eng. Chem. Fund., 17, p. 174 (1978).
[15] Dente, M., Ranzi, E. and Goossens, A.G., Detail Prediction of Olefin Yields from Hydrocarbon Pyrolysis through a Fundamental Simulation Model (SPYRO), Comput. Chem. Eng., 3, p. 61 (1979).
[16] Froment G., Van de Steene, B.O. and Van Damme, P., Thermal Cracking of Ethane and Ethane-Propane Mixtures, Ind. Eng. Chem. Process Des. Dev., 15, p. 495 (1976).
Iranian Journal of Chemistry and Chemical Engineering
Volume 29, Issue 4 - Serial Number 56
December 2010
Pages 135-147

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