Linear Mass Balances
Motivation
• To study feasibility of initial
a flowsheet
– Mass and energy balances for
operating cost and profit
margins
– Targeting for preliminary
sizing
• To provide initial solution to
non-linear models
Approach
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•
Set preliminary temperature and
pressures
Approximate per pass reactor
conversion based on limiting reactant
conversion or equilibrium
Relate each other unit outlet
component flows linearly to unit inlet
flow
Solve resulting linear balancing problem
Recalculate T&Ps from equilibrium
relations
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–
•
if there is no significant and reiterate
through step 1
Go to next step
Perform and energy balance to get heat
duties
Mixer and Degrees of Freedom
Mixer and Degrees of Freedom
Continued
Splitter
Fixed Conversion Reactor
For each reaction r, define
l(r) which is the limiting
reactant and normalized
stoichiometric coefficient
r= 1,…, NR, where NR is the number reactions,
Is the fraction converted per pass in
terms of reactants, r= 1,…, NR
Fixed Conversion Reactor Example
While remaining one are