Kinetics Finals

• CSTR/Backmix/MFR

• PFR/Tubular Reactor

• Packed Bed Reactor

These are the General Types of Flow Reactors

MFR

also called Continuously-Stirred Tank Reactor (CSTR) / Backmix Reactor

MFR

Primarily used for liquids

• steady state

• perfectly mixed (uniformly- mixed).

MFR operates normally at __________ and assumed to be _________________

• Temperature

• Concentration

• Reaction Rate

no time dependence or position dependence of the ____, ________, and __________ inside the CSTR

every variable is the same at every point inside the reactor.

no time dependence or position dependence of the T, C, or reaction rate inside the CSTR – meaning, _______________________________________________

Temperature and Concentration

The _______ and ___________ in the exit stream are modelled as being the same as those inside the reactor.

Input = Output + Generation/Disappearance + Accumulation

What the General Material Balance?

PFR

Just like the MFR, these reactors are assumed to operate at steady-state

Tubular Reactors

PFR are modelled for ______________

PFR

Cylindrical pipe is normally operated at steady-state EXCEPT at start-up or shutdown so that the properties are constant with time

PFR

Used often for gas phase reactions

Velocity

In PFR, this is assumed uniform across the radius

Radial variation

In PFR, there is no ____________ in reaction rate

Radial Direction

In PFR, complete mixing is achieved at _____________