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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 :