Table 4 - 5

Nomenclature of Symbols Used in Section 4

Nomenclature for Section 4 - B

k	Reflux ratio R/Rm
N	Number of trays in the column
P	Column pressure in ATM
R	Reflux rate
Rm	Minimum reflux rate
S	Separation factor as given by
x	Concentration, mole fraction
	Murphee plate efficiency
	Relative volatility (light key to heavy key)

Nomenclature for Section 4 - C

B	Bottoms product, flowrate
BV	Bottoms product flowrate, taken as vapor
cp	Heat capacity at constant pressure
cv	Heat capacity at constant volume
D	Distillate, overhead product, flowrate
DL	Distillate product flowrate, taken as liquid
	Efficiency, Carnot cycle
,	Efficiencies of real process as compared to the Caront cycle, causes inefficiencies as heat in the process, causes no heat addition
h	Enthalpy, Btu per pound or pound mole
k	Specific heat ratio,
PBL	Pressure of the bottoms liquid
Pc	Pressure at which the cold side boils
Ph	Pressure at which the hot side condenses
POV	Pressure of the overhead vapor
q	heat flow, between two substances
qc	Heat flow out or to a cold, constant temperature source or the total condensing duty for the distillation column
qc'	Heat flow from the condensing side of the condenser-reboiler in a vapor recompression system
qh	The heat flow to or from a hot source, or the heat duty of the reboiler in a distillation column
qh'	The heat flow from the boiling side of the condenser-reboiler in a vapor recompression system
R	Reflux ratio of the column, reflux liquid to distillate product
RV	The reflux vapor from the column bottom to provide R reflux at the top
TBL	Bubble point temperature of the bottoms liquid
Tc	Temperature of the cold source
Th	Temperature of the hot source
TOV	Bubble point temperature of the overhead vapor
V	Volume of gas, ft3
W	Work, energy input into the process
WIDEAL	Work needed by a Carnot cycle to move a heat flow qc to the hot sink
Z	Compressibility factor
	Heat of vaporization
	Temperature difference driving force across the condenser-reboiler