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F SC 432 Quiz 3 Key
answers to quiz 3
10
Chemical Engineering
Undergraduate 4
12/19/2012

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Cards

Term
Fluid Catalytic Cracking is a
A. hydrogen addition process.
B. finishing process.
C. carbon rejection process.
D. free radical chain reaction.
E. semi-continuous process.
Definition
carbon rejection process
Term
carbenium ions are made by ___
Definition
adding protons to olefins
Term
name two processes that use a similar concept for providing heat to break chemical bonds
Definition
fluid coking
FCC
Term
name two processes that use multiple reactors for continuous flow of the feedstock
Definition
delayed coking
fixed-bed catalytic cracking
Term
catalytic cracking produces branched alkanes because...
Definition
Secondary and tertiary carbocations are more stable than primary cations
Term
A wet flue gas analysis from an FCC regenerator is as follows: N2: 80%, CO2:13%, CO:1%, O2:1%, and H2O: 5%. What is the hydrogen content as wt% of the coke burnt in the regenerator?
Definition
5.6%

[see notes for soln]
Term
Desirable catalytic reforming reactions are promoted by high temperatures and low pressures as explained by the principles of ___
Definition
thermodynamics
Term
Changing what reaction condition creates a conflict between promoting dehydrocyclization reactions and inhibiting hydrocracking reactions in catalytic reforming?
Definition
space velocity
Term
Catalytic reforming involves

A. hydrogen addition and dearomatization.
B. hydrogen oxidation.
C. carbon rejection and hydrogen production.
D. carbon addition.
E. carbon reduction.
Definition
carbon rejection and hydrogen production
Term
Hydrogen is recycled in the catalytic reforming process to
A. promote cyclization reactions.
B. promote aromatization reactions.
C. inhibit isomerization reactions.
D. inhibit coking on catalysts.
E. inhibit hydrocracking reactions.
Definition
inhibit coking on catalysts
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