Formation of Free Sulfur in Hydrodesulfurized Gas Oil—Precautions for Pilot Test of Ultra Deep Hydrodesulfurization Catalysts

Special precautions for evaluating ultra deep gas oil hydrodesulfurization catalysts in the pilot plant were investigated. Analysis using gas chromatograph atomic emission detector (GC-AED) and GC-MS showed free sulfur was formed in the hydrodesulfurized product gas oil, if H2S dissolved in the prod...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Japan Petroleum Institute 2005, Vol.48(5), pp.319-323
Main Authors: Iwamoto, Ryuichiro, Koshika, Hiromichi, Takahashi, Nobuyuki, Inamura, Kazuhiro
Format: Article
Language:English
Subjects:
Applied sciences
Crude oil, natural gas and petroleum products
Energy
Exact sciences and technology
Free sulfur
Fuels
Hydrogen sulfide
Light gas oil
Ultra deep hydrodesulfurization
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Special precautions for evaluating ultra deep gas oil hydrodesulfurization catalysts in the pilot plant were investigated. Analysis using gas chromatograph atomic emission detector (GC-AED) and GC-MS showed free sulfur was formed in the hydrodesulfurized product gas oil, if H2S dissolved in the product oil contacted air. Although the precise mechanism of free sulfur formation is not clear, direct oxidation of H2S, Claus reaction or the oxidation of ammonium polysulfide are possible routes. Once free sulfur forms in the product gas oil, it is difficult to remove by stripping with nitrogen gas. To prevent the formation of free sulfur compound completely, H2S should be separated before contacting air in a pilot plant or in a sampling chamber sealed with nitrogen gas. On the other hand, no free sulfur compound was observed in commercial gas oil, as no contact with air occurs before H2S stripping.
ISSN:1346-8804
1349-273X
DOI:10.1627/jpi.48.319