Send the link below via email or IMCopy
Present to your audienceStart remote presentation
- Invited audience members will follow you as you navigate and present
- People invited to a presentation do not need a Prezi account
- This link expires 10 minutes after you close the presentation
- A maximum of 30 users can follow your presentation
- Learn more about this feature in our knowledge base article
Do you really want to delete this prezi?
Neither you, nor the coeditors you shared it with will be able to recover it again.
Make your likes visible on Facebook?
You can change this under Settings & Account at any time.
Summary of Kinetics & Reactor Design
Transcript of Summary of Kinetics & Reactor Design
CONVERSION AND REACTOR SIZING
RATE LAWS AND STOICHIOMETRY
general mole balance equation
IN - OUT + GENERATION = ACCUMULATION
Continuous-Stirred Tank Reactor
types of reactors
Conversion, X, is the moles of A
reacted per mole A feed.
For reactors in series with no side streams
total moles of A reacted up to point i
moles A fed to the first reactor
Series of CSTR and PFR
, the maximum value of conversion, X, is that for complete conversion, i.e. X=1.0.
, the maximum value of conversion, X, is the equilibrium conversion, i.e. X=Xe.
Given -rA=f(X), we can size any reactor using
, tau, is obtained by dividing the reactor volume by the volumetric flow rate entering the reactor.
describes the behavior of a reaction. The
rate of a reaction
is a function of temperature (through the rate constant) and concentration.
RELATIVE RATES OF REACTION
POWER LAW MODEL
RATE CONSTANT, k
Elementary Rate Laws
A reaction follows an elementary rate law if and only if the (iff) stoichiometric coefficients are the same as the individual reaction order of each species.
eg : Rate law for
Non-elementary Rate Laws
then the reaction is said to be 2nd order in A, 1st order in B, and 3rd order overall.
If rate law for non-elementary reaction
The net rate of formation of any species is equal to its rate of formation in the forward reaction plus its rate of formation in the reverse reaction:
At equilibrium, ratenet=~ 0 and the rate law must reduce to an equation that is thermodynamically consistent with the equilibrium constant for the reaction.
To set up stoichiometry tables, we use A as our basis of calculation. C = f(x) is combined with rate law to obtain -r =f(x)
Flow gas phase
Solution Conversion Algorithm
1. Mole balance and design equation
2. Rate Law
D. Software Packages
Measures other than Conversion
1. Gases :
2. Liquids :