Page 23 - Distillation theory

P1: FCH/FFX P2: FCH/FFX QC: FCH/FFX T1: FCH
CB644-FM CB644-Petlyuk-v1 June 15, 2004 4:28

Nomenclature xxi

Reg sh,R , Reg sh,R separatrix sharp split region for rectifying or
sep,r
sep,s
stripping section for given reflux R respectively
R
R
Reg w,r , Reg R Reg w,e rectifying or stripping or extractive section
w,s
working region at given reflux R respectively
Reg i: j , Reg i: j , Reg i: j(E) sharp split region for rectifying or stripping or
sh,r sh,s sh,e
extractive section for split i : j respectively
Reg h rev,r , Reg l rev,s , Reg m reversible distillation region for rectifying section
rev,e
with h heavy component or stripping section
with l light component or extractive section with
m middle component respectively
attraction region
Reg att
two liquid phases region
Reg L−L
region of pitchfork
Reg pitch
product simplex at infinite reflux
Reg simp
subregion of distillation at infinite reflux
Reg sub
tangential pinch region
Reg tang
S reboil ratio
S entropy
S saddle
S 1 tear-off point of section trajectory at sharp split
S 2 tear-off point of section trajectory at minimum
reflux
2
1
S − S − N + boundary element of trajectory bundle at sharp
split
2
S − N + boundary element of trajectory bundle at
minimum reflux
SN saddle-node
S r or S s or S m saddle point of rectifying or stripping or
intermediate trajectory bundle respectively
T temperature, K
V vapor stream (flow rate), kmol/sec
x mole fraction of liquid phase
x t tear-off point of reversible distillation
rev
trajectory
x pseudoproduct point
D
x ∞ or x min composition on first plate under feed cross section
f f
at which number of stripping section plate is
infinite or minimal respectively
x ∞ or x min composition on first plate above feed cross section
f −1 f −1
at which number of rectifying section plate is
infinite or minimal respectively
x branch branch point of reversible distillation trajectory
rev
sh
(x )or(x sh ) composition on first plate under or above feed
f f −1
cross section at sharp split respectively