Anti-coking property of the SiO2/S coating during light naphtha steam cracking in a pilot plant setup

Journal of Analytical and Applied Pyrolysis, Volume 90, Issue 1, January 2011, Pages 7-12

Anti-coking property of the SiO2/S coating during light naphtha steam cracking in a pilot plant setup

Jianxin Zhou, Zhiyuan Wang, Xiaojian Luan, Hong Xu 

hxu@ecust.edu.cn

School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China

Abstract

Describes how a SiO₂/S coating was prepared on the internal surface of HK40 alloy tube in a pilot plant setup. The coating sampled on the outlet of furnace tube was characterized by scanning electron microscope (SEM). The anti-coking property of the SiO₂/S coating was evaluated with light naphtha according to pressure changes.

The morphologies and chemical components of cokes on the outlet of the coated and blank tubes were characterized by SEM and energy dispersive spectroscopy (EDS), respectively. The main product yields of light naphtha steam cracking were analyzed by gas chromatography–mass spectrometry (GC–MS). The results show that the SiO₂/S coating is compact and has a thickness of 15 μm on the outlet of furnace tube. The SiO₂/S coating reduces coke yield by 60% compared to that observed in the blank tube during 8 h cracking run.

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