Abstract
Coke deposits during thermal cracking of light naphtha in the presence of the sulfur/phosphorous-containing additive and the anti-coking SiO2/S coating were investigated. The structure of the coke layer was studied. The results show that the coke is more amorphous with the additive mass concentration of 200μg.g-1. The additive has altered the microstructure of the coke layer by effecting the dehydrogenation reaction during coke formation. Coke deposits on the SiO2/S coating prepared by atmosphere pressure chemical vapor deposition (APCVD) method are mainly composed of coke granules. The TGA results show that the coke deposits are mainly composed of a small amount of volatile coke and a large amount of hard coke. The results of the low H/C ratios show the highly condensed structure of the coke deposits. When additive is added, inorganic sulfur is mainly formed in the cokes based on the analysis of XPS spectra. Phosphorus in the cokes is in the form of PO43- and phosphide species. The analyses of Raman spectra indicate that the coke deposits formed during thermal cracking are mainly composed of amorphous carbon. Cokes deposited on the SiO2/S coating are more disordered, which may make the decoking operation facilitated.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
