DETAILS OF q-LINE :

TABLE 2.1

 

VALUE OF q	SLOPE OF THE q-line (Equation 1)	CONDITION OF FEED (Equation 2)
0	0 i.e. Horizontal Line	Hf = hF , feed is a saturated vapor
1	Infinite i.e. vertical line	hF = hf , feed is a saturated liquid
0-1	-ve inclined between saturated liquid and saturated vapor line	Feed is a mixture of saturated vapor and saturated liquid
>1	+ve inclined beyond saturated q-line	hF < hf , feed is a liquid below the saturated liquid line
<0	+ve inclined below saturated vapor line	Feed is a superheated vapor

 

 

FIG 2.3 LOCATION OF q-LINE FOR TYPICAL FEED COND ITIONS

.....................................equation 2.1

.....................................equation 2.2

 

NOMENCLATURE :

 

TABLE 2.2

 

Hf	Enthalpy of Vapor
hF	Enthalpy of Feed
hf	Enthalpy of Liquid
xF	Mole Fraction of Feed
xB	Mole Fraction of Bottom Product
xD	Mole Fraction of Distillate
R	Reflux Ratio

 

The Basic difference between Design and Simulation of a Distillation Column is :

 

In Design	Given	alpha,xD,xB,xF,q and R
	Determine	NR, NS,Diameter and Cost
In Simulation	Given	alpha, NR, NS and xF
	Determine	xD, xB and R