Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 32601
Effect of Tube Materials and Special Coating on Coke Deposition in the Steam Cracking of Hydrocarbons

Authors: A. Niaei, D. Salari , N. Daneshvar, A. Chamandeh, R. Nabavi


The steam cracking reactions are always accompanied with the formation of coke which deposits on the walls of the tubular reactors. The investigation has attempted to control catalytic coking by the applying aluminum, zinc and ceramic coating like aluminum-magnesium by thermal spray and pack cementation method. Rate of coke formation during steam cracking of naphtha has been investigated both for uncoated stainless steel (with different alloys) and metal coating constructed with thermal Spray and pack cementation method with metal powders of Aluminum, Aluminum-Magnesium, zinc, silicon, nickel and chromium. The results of the study show that passivating the surface of SS321 with a coating of Aluminum and Aluminum-Magnesium can significantly reduce the rate of coke deposition during naphtha pyrolysis. SEM and EDAX techniques (Philips XL Series) were used to examine the coke deposits formed by the metal-hydrocarbon reactions. Our objective was to separate the different stages by identifying the characteristic morphologies.

Keywords: Steam Cracking, Pyrolysis, Coke deposition, thermalspray, Pack Cementation.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2933


[1] L. F. Albright, and B. L. Crynes, Tan, L. F., "Thermal Cracking", Encyclopedia of Physical Science and Technology, Ed. New York: McGraw-Hill, 2002, Vol.16, pp.613.
[2] L.F. Albright, W. A, Gill, "Aluminized Ethylene Furnace tubes Extend Operation Life", Oil & Gas J. 47-50. 1987
[3] K. Wynny, A. Bayer, "Diffusion Coated Ethylene Furnace tubes", U.S. Patent, 5873951. 1999.
[4] K. Wynny, A. Bayer, "Surface Alloy System Conversion For High Temperature Application", U.S. Patent, 6537388B1. 2003.