Mineral oils: processes and products – Refining – Sulfur removal
Reexamination Certificate
2005-08-16
2005-08-16
Griffin, Walter D. (Department: 1764)
Mineral oils: processes and products
Refining
Sulfur removal
C208S213000, C208S21600R, C208S217000, C208S20800M
Reexamination Certificate
active
06929738
ABSTRACT:
A two stage hydrodesulfurizing process for producing low sulfur distillates. A distillate boiling range feedstock containing in excess of about 3,000 wppm sulfur is hydrodesulfurized in a first hydrodesulfurizing stage containing one or more reaction zones in the presence of hydrogen and a hydrodesulfurizing catalyst. The liquid product stream thereof is passed to a first separation stage wherein a vapor phase product stream and a liquid product stream are produced. The liquid product stream, which has a substantially lower sulfur and nitrogen content then the original feedstream is passed to a second hydrodesulfurizing stage also containing one or more reaction zones where it is reacted in the presence of hydrogen and a second hydrodesulfurizing catalyst at hydrodesulfurizing conditions. The catalyst in any one or more reaction zones is a bulk multimetallic catalyst comprised of at least one Group VIII non-noble metal and at least two Group VIB metals.
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Ellis Edward Stanley
Hou Zhiguo
Kerby Michael Charles
Klein Darryl Patrick
McVicker Gary Brice
ExxonMobil Research and Engineering Company
Griffin Walter D.
Hughes Gerard J.
Kliebert Jeremy J.
Nguyen Tam M.
LandOfFree
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