The liquid phase reaction, A B in adiabatic batch reactor. The initial temperature is 100°C. Initially the reactor (100-L volume) contains only A, C Ao= 5.0
= =83
. The heat of reaction is -14 kJ/mol and is dependent of temperature.
.6, -rA=kCA2.5, k=2.5x10-3 e-1760/T
a. What is the reactor temperature when 60% of A has reacted? b. How long does it take to reach 60% conversion of A?
The reaction AB takes place in an adiabatic CSTR whose volume is 50 L. the total feed flow rate is 100 mol% A. the feed is at 350 K and its heat capacity is 16 The heat of reaction = -2000
. The volumetric feed rate is 25
The rate of reaction = -rA = CA1.5 exp(14
ℎ
ℎ
and it is 30
.
5000
)
What are the outlet temperature and flow rate of A?
The gas-phase reaction AB + C is carried out in an adiabatic 800-L PFR. The reaction is first order in a and the rate constant is k=60exp(
−500
heat of reaction of -122
) s -1. The feed to the reactor is pure A at 15 bar and 450 K with a volumetric flow rate of 1.956 ,
, heat capacities of =40
, =15
, and =25
.
Plot the molar flow rates of A and B as a function of cumulative c umulative volume down the reactor, plot temp versus volume.
Adiabatic reactor temperature for a reversible reaction for the liquid phase reaction A↔B, determine the adiabatic equilibrium temperature and conversion when pure A is fed to the reactor at 300 K.
= =50
KC=105 at 298 K
ΔHrxn= -20,000
Assume CPS are independent to temperature. Assume ideal liquid solution.
The liquid phase reaction A+2B C+D is conducted in a CSTR. The reaction Kinetics are first order in both A and B with the
rate constant KA=0.17
. The feed is equimolar at C AO=CBO=0.80
.
flow rate of the solvent is 720
, and the inlet volumetric flow is 18
. The molar
. The reactor temperature is to be held at 350 K.
a.
What reactor volume is needed to achieve an outlet flow rate of C of 4.5
?
b. The reactor feed is at a temperature of 300 K to maintain the reactor temperature at 350 K., will the reactor to be heated or will it needed to be cooled? At what rate must heat be added to or removed from the reactor? Some additional data: (values maybe consider constant over the temperature range from 300-400 K ) ΔHrxn= -24
= =75
CPsolvent= 40
The elementary, reversible liquid-phase reaction A+B↔2C is being conducted in a CSTR, components A and B are the only one fed. Other information on this reaction system is given below using this information, determine the reactor volume required to achieve a conversion of 50 %.
=80 =70 =85
FAO=100
CAO=10
FBO=200
TO=500 K
k(300 K)=1.6x10-6
ΔHrxn=12
.
E=15
KC(300 K)=0.0014
The liquid phase reaction AB takes place in a 1000-L jacketed CSTR. The feed concentration of a is 5.0
, and the feed
temperature is 350 K. the reactant A is dissolved in water, and the water concentration in the feed is 50
. The exit
temperature from the reactor is 370 K. the reaction rate was measured as a function of the concentration of A in a batch reactor, and the result are shown in the figure. Additional information: ΔHrxn=-30
UA=14
.
= =30
CPwater=18
What is the volumetric flow rate will result in an outlet concentration of B 0 f 4.0
? What coolant temperature is needed
to obtain this outlet concentration?
The gas phase reaction (A+2B Products) is taking place in an adiabatic PBR. The temperature of the inlet stream, which consist of 20 mole % A, 45 mole % B ad 35 mole % inert is at 500 K. at the outlet of the reactor, the conversion of A is measures at 40% and the temperature is 487 K. the heat of reaction and the heat capacities of the feed components are known to be approximately constant bet 300 and 700 K. a. Is the reaction endothermic or exothermic? b. In a process change, the space time is increased by a factor of two. The temperature at the outlet is now measured to be 482 K, what is the conversion of A?
The elementary irreversible gas-phase reaction AB+C is carried out adiabatically in a PFR packed with catalyst. Pure A enters the reactor at a temperature of 450 K, volumetric flow rate of 20
at a pressure of 10 atm. What catalyst weight
is necessary to achieve 80% conversion in a CSTR?
=40
=425
0 (273)=-70
0 (273)=-50
50
..
K=0.133exp( (
))
with E=31.4
=15
0 (273)=-40
The liquid-phase reaction A↔B, determine the adiabatic equilibrium temperature and conversion when pure A is fed to the reactor at 300 K.
= =50
KC(298 K)=105;
;
ΔHrxn= -20,000
Assume CPS are independent of temperature. Assume ideal liquid solution.
The elementary reversible reaction A+B↔2C occurs in a liquid–phase in an isothermal CSTR. A stream containing equimolar amount of A and B in a solvent enters a reactor, and the conversion of A is measured to be 60%. The equilibrium conversion of A under the same conditions is known to be 80%. The volumetric flowrate into the process is to be increased by a factor of 1.5 with the inlet concentrations of A and B, and the temperature remains constant. What is the new conversion of A?
The elementary irreversible reaction A+BC is conducted in the gas-phase in an isothermal PFR. The feed enters the reactor at a pressure of 10 bar and the temperature of 650 K and consist of 30% A, 30% B and 40% inert. The conversion of A in an existing PFR is measures to be 50%. By what factor should the PFR volume used for this process be increased to achieve a conversion of 75% if there is no change in the feed stream?
Polymerization of styrene (S) and butadiene (B) in an isothermal batch reac tor. Initial charge to reactor: 2,200 Kg S and 5,000 Kg B Reactor volume: 27 m3 (assume constatnt density)
-rS=kCSCB
k=0.036
Kmol.h
S+3.2Bpolymer What are the concentrations of A and B in a reactor after 10 hours?
An isothermal tubular reactor is used for the reaction: 10A(g) B(s). The solid particles are carried along with the gas flow. The volume they occupy is insignificant compared to the gas phase volume. The reaction is first order, and k=0.3 min -1, where k is defined for the reaction: -rA=10kCA. The reactor volume is 100 L. Pure A is fed to the reactor at 10 bar and 450 K at a rate of 120
. what is the exit conversion?
A 400-L CSTR and a 100-L PFR are available to the process. 1-L feed of feed per second. The feed contains 41% A, 41% B, and 18% inert. The irreversible gas-phase reaction A+B C is to be carried out at 10 atm and 227°C. The rate of reaction in
is given as a function of conversion.
.
X
-rA
0 0.1 0.4 0.7 0.9
0.2 0.0167 0.00488 0.00286 0.00204
a. What is the maximum conversion that c an be achieved with these two reactors connected in series? b. What would be the overall conversion if two 400-L CSTRs were connected in series for the same feed and operating conditions? c. What would be the overall conversion if two 400-L CSTRs were connected in parallel with half of the feed going to each reactors?
The elementary irreversible reaction liquid phase reaction AB+C is carried out in a CSTR and a conversion of 70% is achieve. You have two new reactors that are each exactly half the size of the original CSTR, and wish to them to replace the original CSTR. If the two new reactors are used in series and the feed conditions remain identical to those for the original reactors, what will be the total conversion achieved in the 2-reactor chain?
The elementary irreversible reaction aqueous-phase reaction A+BR+S is carried out isothermal as follows. Equal volumetric flow rates of two liquid streams are introduced into a 4 L mixing tank. One stream contains 0.020 other 1.4
and the
. the mixed stream is then passed through a 16-L plug flow reactor. We find that some R is formed in the
mixing tank, its concentration being 0.002
. Assuming that the mixing tank acts as mixed reactor, find the concentration
of R at the exit of the plug flow reactor as well as the fraction of initial A that has been converted in the system.
The endothermic liquid-phase elementary reaction A+B2C proceeds substantially to completion in a jacketed C STR. From the following data, calculate the CS TR temperature: Reactor volume: 125 gal Steam jacketed area: 10ft2 Jacket steam: 150 psig (365.9°F sat temp) Overall heat transfer coeffecint of jacket: U=150
Btu h. .°F
Agitator shaft power: 25 hp Heat of reaction: ΔHrxn=20,000
Btu lbmol
of A (independent to temperature)
Feed (
ℎ
)
Feed tepmeprature (°F) Specific heat (
Btu
lbmol.°F
Molecular weight Density (
)
)
A 10
Component B 10
C 0
80 51.0
80 44
47.5
128 63.0
94 67.2
65
The elementary irreversible reaction is car ried out adiabatically in a flow reactor, A+BC Given: TO=27°C=300 K CAO=0.1 k=0.01 at 300 K 0 (273)=-20 νO=2
XA=0.85
0 (273)=-15 0 (273)=-41
= =15
=30
.
E=10,000
a. Calculate the PFR and CSTR volumes necessary to achieve 85% conversion. b. What is the maximum inlet temperature o ne could have so that the boiling point of the liquid (550 K) would not be exceeded even for complete conversion? c. Calculate the conversion that can be achieved in one 500-dm3 CSTR and in two 250-dm3 CSTR in series.
You are operating a batch reactor and the reaction is first-order, liquid-phase and endothermic. An inert coolant is added to the reaction mixture to control the temperature. The temperature is kept constant by varying the flow rate of the coolant. Calculate the flow rate of the coolant 2 hours after the start of the reaction. Temperature of the reaction: 100 °F Initially: vessel contains only A (no B or C Present) -4 -1 K at 100°F: 1.2 x 10 s CAO: 0.5 Temperature of the coolant 80°F Initial volume: 50 ft 3 Heat capacities of all components: 0.5 Density of all components: 50
0: -25,000
°
A second-order, endothermic reaction (ΔH= 25,000 AB+C
k=1016
, −
) takes place in a steady state, jacketed plug flow.
(T is in Kelvin)
.
The reactor feed contain reactant A at 250°C and a concentration of 2.5x103 and the heat transfer coefficient through the walls is 30
.
. The tubular reactor diameter is 8.0 cm,
. The fluid in the jacket surrounding the reactor is at
300°C is the temperature of the reactor contents immediately downstream from the inlet higher or lower than the feed temperature?
The first-order reaction AB takes place in an isothermal CSTR. The feed temperature is 20°C and the reactor is held at 170°C by the heat exchanger. The coolant temperature is 40°C. a. What size is required to obtain 90% conversion? b. What heat transfer coefficient is needed if the heat transfer area is 6.13m2? ΔHrxn=-30
CAO=3000
= =0.15
νO=0.2
k=0.8 h-1 (at 170°C)
A 100-L CSTR is used for the reaction that follows a second-order rate law: -rA=kCAO(1-X)2 where X is the conversion and CAO is the inlet concentration of the limiting reactant. A conversion of 75% is achieved in the CSTR. A PFR of the same volume is added in the series to the CSTR to increase the conversion. Should it be added before or after the CSTR? What is the final conversion?
A first-order, liquid-phase, irreversible reaction AB+C is carried out in a batch reactor over a period of an hour, a conversion of 90% is achieved. The CSTR that is currently used in batch mode is under consideration for conversion to a CSTR in order to increase the tons of B and C that can be produced per year. What space time is required to achieve 90% conversion in a CSTR?
