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F SC 432 Quiz 5 Key
answers to quiz 5
14
Chemical Engineering
Undergraduate 4
12/19/2012

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Term
why is alkylation favored in US refineries?
Definition
environmental legislation limits the amount of aromatics in gasoline
(so we want to increase octane # with iso-alkanes instead)
Term
Polymerization is not called alkylation because
Definition
the reactants used for polymerization do not contain alkanes
Term
hydrotreatment is what kind of process?
Definition
finishing
Term
Usually the first process in a hydrotreatment sequence is
Definition
hydrodemetallation
Term
Removal of nitrogen (HDN) may be used as a pretreatment process in a refinery in order to protect
Definition
acid catalysts
Term
True octane numbers of a reformate and straight run gasoline are 90 and 60, respectively. Is calculation of the octane number of a blend made from these possible with this info?
Definition
not possible
Term
T/F?
Claus process cannot remove CS2 or COS
Definition
True
Term
T/F?
Claus and SCOT processes work in sequence to convert H2S to elemental S
Definition
True
Term
T/F?
Hydrogen is recovered from H2S through Claus and SCOT processes
Definition
False
Term
T/F?
Claus process produces SO2 as an intermediate product
Definition
True
Term
T/F?
SCOT process uses H2 to convert CS2 and COS to H2S
Definition
True
Term
Which measure below does NOT help with reducing the amount of waste water for treatment in refineries?
A. Controlling surfactants in water use.
B. Using process water for desalting.
C. Segregation of waste water streams.
D. Combination of all waste water streams.
E. Water conservation in refinery units.
Definition
combination of all waste water streams
Term
The majority of sulfur compounds found in the gasoline pool comes from which process?
Definition
FCC
Term
The developments in the end of the century refinery (1980 – 2000) focused on upgrading
A. the heavy ends of crude oil.
B. the light ends of crude oil.
C. the oxygenated crude oil.
D. the sweet crudes.
E. the salty crudes.
Definition
the heavy ends of crude oil
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