Coke Inhibition During Naphtha Pyrolysis

Salari, D.; Niaei, A.; Towfighi, J.; Nakhostin Panahi, P.

Coke Inhibition During Naphtha Pyrolysis

Document Type : Full article

Authors

D. Salari ¹

A. Niaei ²

J. Towfighi ³

P. Nakhostin Panahi ⁴

¹ Petroleum Research Laboratory, Department of Applied Chemistry, University of Tabriz, Tabriz, Iran

² etroleum Research Laboratory, Department of Applied Chemistry, University of Tabriz, Tabriz, Iran.

³ Department of Chemical Engineering, Tarbiat Modares University, Tehran, Iran

⁴ Petroleum Research Laboratory, Department of Applied Chemistry, University of Tabriz, Tabriz, Iran.

Abstract

The effectiveness of binary mixtures of phosphorus and sulfur compounds as coke inhibitors for naphtha pyrolysis has been studied. As both phosphorus and sulfur compounds proved to be promising coke inhibitors, runs were made with mixtures of these compounds. The coke deposited was significantly lower when phosphor was used together with sulfur. Also, the effect of the addition of K₂CO₃ and K₂CO₃ in the naphtha feed was investigated. It was found that the addition of Na₂CO₃ and K₂CO₃ reduced the coke formation. Scanning electron microscope (SEM) was used for the
microstructure of deposited coke and energy dispersive X-Ray spectroscopy (EDAX) for the surface elemental composition of coke formed on the surface of stainless steel coupons. It was found that in the presence of inhibitors, deposited coke has a porous structure and so small amounts of Ni , Cr , and Fe elements.

Keywords

Coke deposition

Coke inhibitor

Organosulfur compounds

Organo-phosphor compounds