Reaction Engineering (Set 5) Flashcards
Concepts necessary for reactor design, operation, and maintenance.
The following half life data are available for the irreversible liquid phase reaction A products.
https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/470-419-1.png The overall order of reaction is
1.5
A non-catalytic chemical reaction of the type https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/457-279-1.png is called a ____ reaction.
series-parallel
The unit of frequency factor in Arhenious equation is
same as that of rate constant.
With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion)
increases
Reaction of benzene with chlorine gas to produce tri-chlorobenzene exemplifies a/an ____ reaction.
consecutive
For the gaseous reaction 2A –> B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is
-0.25
The molecularity and the order of reaction respectively, for the hydrolysis of methyl acetate in presence of acids are
2 & 1
The irreversible reaction is a special case of reversible reaction, if the
reactant concentration at equilibrium condition is zero.
A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m3 and volumetric flow rate 1m3 /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m3 . The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 kmole/m3 , the volume of the mixed flow reactor should be increased by a factor of
7
For the liquid phase parallel reactions:
R, rR = K1.CA2; E1 = 80 KJ/mole
S, rs= K1.CA ; E2 = 120 KJ/mole
The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted at
high temperature in a PFR.
In an ideal mixed reactor (at steady state), the
all (a), (b) and (c).
The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of ____ order.
second
Which of the following factors control the design of a fluid-solid reactor ?
All (a), (b) and (c).
A Catalyst
shortens the time to reach the equilibrium.
The reaction rate constants at two different temperature T1 and T2 are related by
https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/470-421-2.png
The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called
fungi
Pick out the wrong statement.
The intercept of the Arrhenious plot is called the ‘activation energy’.
Kinetics of a catalytic reaction can be best studied on a/an ____ reactor.
either (a), (b) and (c).
In case of a ____ reactor, the composition in the reactor and at the exit of the reactor is the same.
back-mix
Exothermic reactions are best carried out in
CSTR followed by a plug flow reactor.
What is the order of chemical reaction https://www.indiabix.com/_files/images/chemical-engineering/chemical-reaction-engineering/449-166-1.png , if itis found that the reaction rate doubles on doubling the concentration of B and also the reaction rate doubles when the concentrations of both A & B were doubled and quandrupled when the concentrations of both B & C were doubled ?
2
Reactions with high activation energy are
very temperature sensitive
If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.
t ∝ 1/a^n-1
In case of a/an ____ chemical reaction, conversion increases with the rise in temperature.
reversible endothermic