Mineral oils: processes and products – Refining – Sulfur removal
Reexamination Certificate
2005-07-05
2005-07-05
Griffin, Walter D. (Department: 1764)
Mineral oils: processes and products
Refining
Sulfur removal
C208S209000, C208S213000, C208S21600R, C208S059000, C208S217000
Reexamination Certificate
active
06913688
ABSTRACT:
A process for the selective hydrodesulfurization of olefinic naphtha streams containing a substantial amount of organically bound sulfur and olefins. The olefinic naphtha stream is selectively hydrodesulfurized in a first sulfur removal stage and resulting product stream, which contains hydrogen sulfide and organosulfur is fractionated at a temperature to produce a light fraction containing less than about 100 wppm organically bound sulfur and a heavy fraction containing greater than about 100 wppm organically bound sulfur. The light fraction is stripped of at least a portion ofits hydrogen sulfide and can be collected or passed to gasoline blending. The heavy fraction is passed to a second sulfur removal stage wherein at least a portion of any remaining organically bound sulfur is removed.
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Brignac Garland B.
Coker John C.
Gupta Brij
Halbert Thomas R.
Matragrano John G.
ExxonMobil Research and Engineering Company
Griffin Walter D.
Hughes Gerard J.
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