Question

A→B as shown below takes place in an adiabatic CSTR of 50 L volume. The total molar flow rate is 100 mol/h and the feed is 30% A and 70% inerts. The temperature is 350 K, and its heat capacity of A and inert are 16 cal mol-1 K-1 and heat capacity of B is 20 cal mol-1 K-1. The heat of reaction is - 6000 cal mol-1 and conversion is 0.9. What is the outlet temperature of CSTR?

Answer #1

The elementary liquid phase reaction takes place in an adiabatic
flow reactor.
? + ? → ?
An equimolar feed in A and B enters at 300K, and the volumetric
flow rate is 2 dm3
/s and CA0= 100
mol/m3
.
a) Calculate the PFR and CSTR volumes to achieve 75 %
conversion.
b) If the outlet temperature of the reactor is 550 K, for complete
conversion, calculate the inlet temperature
of CSTR.
HA°(273 K) = - 20 kcal/mol, HB°...

Consider the CSTR with first order reaction and the process
parameters and variables are given by: The process parameters and
variables are defined as: CA0 = feed concentration = 2.7 mol/L. Cp
= heat capacity of the reactor feed and product (1000 cal/kg*K) =
Cv. E/R = normalized activation energy (20,000 K). F = mass feed
rate and product rate (10 kg/s). k0 = rate constant (1.97×10^24
1/s). Q = heat addition rate (initially 700,000 cal/s). T0 = feed
temperature...

A liquid-phase reaction A---> B is to be conducted in a CSTR
at steady-state at 163°C. The temperature of the feed is 20°C, and
90% conversion of A is required. Determine the volume of a CSTR (L)
to produce 130 kg of B per hour, and calculate the heat load (kW)
for the process. Does this represent addition or removal of heat
from the system? Data: cp,A = 2.0 J/g·K MW of A = 200 g/mol ? =
0.95 g/cm3...

Homework 3 Problem: A reaction A->R takes place in a
constant-volume isothermal CSTR. The component mass balances
are:
r= dCa/dt= Cai - Ca - KCaٍ
r= dCr/dt=Cri-Cr +KCaCr
where: CAi: feed concentration of A (input); CRi: feed
concentration of R (assumed constant); CA, CR concentrations of AR,
respectively, in the reactor and outlet; r,k, positive
constants.
a) Linearize the equations around the design steady-state (CAis
,CA, CR) and put them in deviation variable form.
b)Calculate the transfer function between CR...

A first order, liquid-phase reaction A ?products, is conducted
in a 2000 L CSTR. The feed contains pure A, at a rate of 300 L
min-1 , with an inlet concentration of 4.0 mol L-1 . The following
additional data are available:
cP = 3.5 J g-1 K-1;
? = 1.15 g cm-3 ;
?HRA = -50 kJ mol-1
(you can assume that these values are constants)
kA = A e-EA/RT = 2.4 x 1015e-12,000/T min-1 , with T in...

Task # 3
the first order reaction A → B, with –rA = kCA, takes place in a
liquid phase in a CSTR reactor witha volume of 10 l. The velocity
constant k equals 2.5 min-1
CA=0.0672 mol/L
3.2
There is an operating accident where the feed flow with A is
interrupted and the concentration of A drops to 0 inreactor. How
long will it take for the feed to resume (ν0 = 0.12 l / s, CA0 =
0.3mol...

The elementary irreversible organic liquid-phase reaction, A + B
→ C, is carried out in a flow reactor. An equal molar feed in A and
B enters at 27 oC, and the volumetric flow rate is 2 L/s. The feed
concentration is CA0 = 0.1 mol/L. a) Calculate the PFR and CSTR
volumes necessary to achieve 85% conversion when the reaction is
carried out adiabatically. b) What is the maximum inlet temperature
one could have so that the boiling point...

The irreversible gas phase rxn, A=> B+C is
performed in an adiabatic, 800-liter PFR with a rate constant, k,
as below:
k=60*exp(-5000/T) s-1
The feed is pure A at 15 bar and 450 K with a
volumetric flow rate of 1.956 L/s. The heat of rxn is -12 kJ/mol
(independent of temperature), heat capacities are CPA = 40 J/mol/K,
CPB = 15 J/mol/K, and CPC = 25 J/mol/K. The reaction is operated at
constant pressure
Plot (a) FA and FB...

A steam of 100mol/s ethanol(C2H5OH) vapor
at 400oC and 1 atm is fed to an adiabatic reator. The
ethanol is reacted to produce acetaldehyde (CH3CHO)
vapor and hydrogen (H2) gas.After a conversion of 30%
the products exit from the reactor at 1atm.It is given that the
heat capacity of acetaldehyde,in kJ/(mol.oC) is given as
below:
Cp,CH3CHO=50.48X10-3+13.26x10-5T-8.049x10-8T2+23.8X10-12T3
i)Express the molar flowrate and specific enthalpy for all
substances in the inlet-outlet enthalpy table.
ii)Show the stoichiometric equation for the reaction in the...

The irreversible gas-phase non-elementary reaction A + 2B
---> C takes place in an isothermal (227 C) constant-volume
batch reactor. The initial feed to the reactor consists of 40 mol%
A and 60 mol% B at a total pressure of 10 atm. Measurements of the
rate of reaction as a function of conversion yielded the following
results:
-rA (mol dm^-3 s^-1) x (1x10^8)
0.010
0.005
0.002
0.001
XA
0.0
0.2
0.4
0.6
Calculate the time required to achieve a conversion...

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