chemical reaction engineering plug flow reactor design

1. DESIGN AND FABRICATION OF
PLUG FLOW REACTOR
BY:
19F-CH-86 ( SAMEER AHMED)
19F-CH-30 (IMAM DIN) INSTRUCTOR: MISS AZKA

2. INTRODUCTION:
The plug flow reactor (PFR, sometimes called
continuous tubular reactor, CTR) is a tubular
reactor where the feed is continuously
introduced at one end and the products
continuously removed from the other end.
The concentration / temperature in the
reactor is not uniform.

3. APPLICATIONS:
Common industrial uses of tubular reactors
are in gasoline production, oil cracking,
synthesis of ammonia from its elements,
and the oxidation of sulfur dioxide to sulfur
trioxide.

4. ADVANTAGES:
 HIGH CONVERSION
GOOD HEAT TRANSFER DURING PROCESS
CONTINUOUS PROCESSING
ECONOMICAL

5. DISADVANTAGES:
 POOR TEMPERATURE CONTROL
SHUTDOWN AND CLEANING IS EXPENSIVE

6. DESIGN CALCULATIONS
MATERIAL: PVC PIPE
DIA: 1 Inch = 2.54 cm
TOTAL VOLUME = 155 ml
NUMBER OF INLETS = 2
NUMBER OF OUTLET = 1
WORKING TEMPERATURE = UPTO 40 C

7. FABRICATION VIDEO:

8. CALCULATIONS:
The elementary, liquid-phase, irreversible reaction
A + B C
is to be carried out in a flow reactor. A 0.155 𝑑𝑚3
PFR that can only be
operated at 300k ( 27 degree centigrade) . The two feed streams to the
reactor mix to form a single feed stream that is equal molar in A and B, with
a total volumetric flow rate of 10 dm3/min. What is the conversion?
Additional Information: at 300 K, k = 0.07 dm3/mol-min
E = 85000 J/mol-K
CA0 = CB0 = 1 mole/dm 3
vA0 = vB0 = 0.5*v0 = 5 dm3/min

9. CONT….
Independent Variable: V, FA0, T
Dependent Variable: X
Known: k0, E, V, n0, CA0B, CB0B
Unknowns: X

10. Assumptions:
1. Isothermal
1. no pressure drop
1. There are no radial variations in the PFR

11. CONT….
MOLAR BALANCE:
RATE LAW:
STOITIOMETRY – LIQUID , v = vo; EQUAL MOLAR:
CA = CA0(1-X)
CB = CA0(1-X)

12. CONT….
Evaluate
v A0 = 5 dm3/min
Before mixing
CA0B = 2 mol/dm3
FA0 = CA0B* vA0
FA0 = (5 dm3/min)(2 mol/dm3) = 10 mol/min
After mixing
v0 = vA0 + vB0 = 5 dm3/min + 5 dm3/min = 10 dm3/min
CA0 = 1 mol/dm3

13. CONT….

14. INTRODUCTION:
The plug flow reactor model (PFR, sometimes
called continuous tubular reactor, CTR) is
normally the name given to a model used in
chemical engineering to describe chemical
reactions in continuous, flowing systems of
cylindrical geometry.

15. THANK YOU