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COMPUTER METHODS - Coggle Diagram
COMPUTER METHODS
MESH EQUATIONS
M = material balance
E = equilibrium relationships i.e. y=kx
S = Summation relationship i.e. some of mole fractions = 1
H = Heat/energy balances
Issue :!:
No forces balance
Pressure drop
No mechanics
Other forces acting
Pre-Computer methods
Constant molar overflow assumption
Lewis Matheson Method
A) Material balance around the condenser and the top of the column
B) Use the assumption of constant molar overflow
c) Material balance around the rectifying section
d) Material balance around the feed section
e) Material balance around the stripping section and rebiller
Thiele and Geddes method
Is the condenser a stage?
Total condenser? No
Nothing is going back into the column
Composition of the product is the same as the top of the column
Partial condenser? Yes.
Is the reboiler a stage?
ALWAYS
V is in equilibrium with the bottoms B and L is at bubble point