What are the advantages of PFR plug flow reactor?
What are the advantages of PFR plug flow reactor?
| Kinds of Phases Present | Usage | Advantages |
|---|---|---|
| 1. Primarily Gas Phase | 1. Large Scale 2. Fast Reactions 3. Homogeneous Reactions 4. Heterogeneous Reactions 5. Continuous Production 6. High Temperature | 1. High Conversion per Unit Volume 2. Low operating (labor) cost) 3. Continuous Operation 4. Good heat transfer |
Which is the disadvantage of batch reactor?
However, the drawbacks associated with this type of operation limit its industrial use: (1) the control of the polymer properties is impracticable; (2) the productivity is low considering the load, unload, and cleaning times; (3) the heat generation rate is high and the control of the reactor temperature is very …
What is a PFR used for?
The plug flow reactor model (PFR, sometimes called continuous tubular reactor, CTR, or piston flow reactors) is a model used to describe chemical reactions in continuous, flowing systems of cylindrical geometry.
How big is a plug flow reactor?
Plug flow reactors may be configured as one long tube or a number of shorter tubes. They range in diameter from a few centimeters to several meters.
How do you calculate the volume of a reactor?
By definition, space velocity can be expressed mathematically as SV = Vo / V. In this expression, Vo represents the volumetric flow rate of the reactants entering the reactor and V represents the volume of the reactor itself.
In which cases CSTR is preffered over PFR?
To achieve the desired conversion with smaller reactor volumes, use a combination. In this case, use a CSTR then a PFR. By doing so, the reactor volume is less than the area underneath the curve. For competing parallel reactions, selectivity for desired product can dominate the choice.
How to calculate the PFR volume of a reactor?
The integral to calculate the PFR volume can be evaluated using a method such as Simpson’s One-Third Rule (pg 925): NOTE: The intervals ( ) shown in the sketch are not drawn to scale. They should be equal. Given that the system is gas phase and isothermal, determine the reactor volume when X = 0.8 X e . First calculate X e :
What is the difference between molar balance equation and batch reactor equation?
There may be a inflow and a outflow in a reactor and reactions are happening inside the reactor (but batch reactor do not contain inflow and outflow. In batch reactor, reactants are filled and products are taken after the reaction). Therefore molar balance equation includes several terms to describe each of those processes.
What is molar balance in Chemical Engineering?
Molar Balance for Reactor Systems – Reaction Engineering Molar balance is very important concept for chemical engineering undergraduate students. For reactor systems in chemical engineering, this phenomenon is widely applied. This theory is helped to calculate flow rates, reaction rates in industrial applications.
What is the formula for concentration in PFR?
In an ideal PFR, concentration is a function of both distance along the flow path, x, and time, t: C = C(x,t) For a mass balance on a reacting compound, take mass balance on differential axial element with uniform reaction potential (concentration), where dV = differential volume A = cross sectional area dx = differential distance and