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Parvaneh Nakhostin Panahi

A. Niaei, D. Salari, J. Towfighi, P. Panahi, and R. Nabavi
Effect of Organophosphorous Compounds as Coke Inhibitors on Coking Rate in the Pyrolysis of Naphtha

The reduction in the rate of coke formation during naphtha pyrolysis due to the injection of triphenyl phosphine (TPP), tri-o-tolyl phosphine (TTP), and triphenyl phosphine oxide (TPPO) has been investigated in a jet stirred reactor at atmospheric pressure in the temperature range of 800–900ıC. Coke formation was significantly reduced in the presence of the additives. The data are consistent with the formation of a metal–phosphorous complex that passivates the metal activity for coke formation. Scanning electron microscope (SEM) and energy dispersive X-ray (EDX) techniques were used for morphological and elemental surface analyses respectively. It was found, that coke formed in presence of organophosphorous inhibitors are softer and have less metal concentrations.



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