Page 353 - Distillation theory

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0521820928gsy CB644-Petlyuk-v1 March 16, 2004 4:50

Short Glossary 327

situated at any reflux and for any product boundary element of concentration
points. In this region, the following con- simplex.
dition is satisfied: K Di > K Dj or K Bi < K Bj Tear-off region (Reg t(k) or Reg t(k) or
r
s
or K Di > K DEj > K Ei . Reg t(k) ) region of k-component bound-
e
Structural condition of trajectory tear-off ary element of concentration simplex
defined order of component volatilities contains tear-off points.
t
t
t
t
must be in tear-off points x ; x ; x : K > Trajectory of distillation section (→) line
r
e
s
ri
t
t
t
t
t
t
K ; K < K ; K eDi > K eDEj > K eEi in concentration space that connects the
si
rj
sj
Tangential pinch region (Reg tang ) region points in which the system of distillation
of concentration simplex where there are equations at given product point and re-
no pinch points at any reflux or reboil ra- flux is satisfied.
tios. Working bundle of section trajectories at
Tear-off point x t min,r or x t min,s at minimum given reflux (N w,r ⇒ N + or N w,s ⇒ N w,s
−
−
+
w,r
2
2
reflux (S , S ) point where the section or N w,e ⇒ N w,e ) bundle contains the
+
−
r
s
trajectory at minimum reflux tear-off distillation working trajectory (x D → or
from boundary element of concentration x B → ) (i.e., trajectory going through
simplex containing all product compo- product point of section).
nents and one impurity component which Working region of section trajectories
volatility is niar to product component at given reflux (Reg R , Reg R Reg R )
w,r w,s w,e
volatilities. region of concentration simplex filled
t
t
1
Tear-off point x or x at sharp split (S , with working bundle of section trajec-
r s r
t
1
S ) point where the section trajectory tories x D ∈ Reg R or x B ∈ Reg R or x ∈
s w,r w,s e
at given reflux tear-off from product Reg R .
w,e