Abstract
The “n-hexane and steam” gaseous mixture was first sent through a precatalytic zone containing quartz beads (temperature T1), and then through a catalyst bed (T2). The latter contained a ZSM5 zeolite or a zeolite-containing hybrid catalyst. By moderately increasing T1 (T2 being kept constant), significant increases in the total n-hexane conversion and in the total yield of light olefins were obtained. The ethylene/propylene product ratio could be varied widely, for instance, from 1.0 to 2.0 by varying T1 from 660 to 720 °C. Such temperature effect of zone I on the overall process performance was explained by the formation of selectivity modifiers such as diolefins. With the hybrid catalyst, the enhanced production of light olefins was also assigned to the formation of large olefins on the Cr–Al-containing cocatalyst.
Similar content being viewed by others
References
A. Chauvel andG. Lefebvre, in: Petrochemical Processes, Vol. 1 (Technip, Paris, 1989) pp. 117–165.
R. Le Van Mao, US Patent 4 732 881 (22 March 1988).
R. Le Van Mao, Micropor. Mesopor. Mater. 28 (1999) 9.
D.A. Hunt, in: Handbook of Petroleum Refining Processes, 2nd Ed., ed. R.A. Meyers (McGraw Hill, Boston, 1997) pp. 3.101–3.112.
J. Scherzer, in: Octane-Enhancing Zeolitic FCC Catalysts, Chem. Ind. Vol. 42 (Dekker, New York, 1990) pp. 89–98.
D. Decrooq, in: Catalytic Cracking of Heavy Petroleum Fractions (Technip, Paris, 1984) pp. 27–31.
B.M. Weckhuysen andR.A. Schoonheydt, Catal. Today 51 (1999) 223.
D.W. Breck, in: Zeolite Molecular Sieves (Wiley, New York, 1974) pp. 493.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Le Van Mao, R., Melancon, S., Gauthier-Campbell, C. et al. Selective deep catalytic cracking process (SDCC) of petroleum feedstocks for the production of light olefins. I. The Catlever effect obtained with a two reaction-zones system on the conversion of n-hexane. Catalysis Letters 73, 181–186 (2001). https://doi.org/10.1023/A:1016685523095
Issue Date:
DOI: https://doi.org/10.1023/A:1016685523095