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Design of binary distillation column
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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

 «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨bold¨»y«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mfenced»«mfrac»«mi mathvariant=¨bold¨»q«/mi»«mrow»«mi mathvariant=¨bold¨»q«/mi»«mo»-«/mo»«mn»1«/mn»«/mrow»«/mfrac»«/mfenced»«mi mathvariant=¨bold¨»x«/mi»«mo»§nbsp;«/mo»«mo»-«/mo»«mfrac»«msub»«mi mathvariant=¨bold¨»x«/mi»«mi mathvariant=¨bold¨»F«/mi»«/msub»«mrow»«mi mathvariant=¨bold¨»q«/mi»«mo»-«/mo»«mn»1«/mn»«/mrow»«/mfrac»«/math».....................................equation 2.1

                     «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨bold¨»q«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mfrac»«mrow»«msub»«mi mathvariant=¨bold¨»H«/mi»«mi mathvariant=¨bold¨»f«/mi»«/msub»«mo»§nbsp;«/mo»«mo»-«/mo»«mo»§nbsp;«/mo»«msub»«mi mathvariant=¨bold¨»h«/mi»«mi mathvariant=¨bold¨»F«/mi»«/msub»«/mrow»«mrow»«msub»«mi mathvariant=¨bold¨»H«/mi»«mi mathvariant=¨bold¨»f«/mi»«/msub»«mo»§nbsp;«/mo»«mo»-«/mo»«msub»«mi mathvariant=¨bold¨»h«/mi»«mi mathvariant=¨bold¨»f«/mi»«/msub»«/mrow»«/mfrac»«/math».....................................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

 

Cite this Simulator:

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