Page 351 - Distillation theory

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Short Glossary

Attraction region (Reg att ) region of con- Joining condition at minimum reflux for
centration simplex in which the section split with distributed component feed
trajectories at given reflux or reboil ratio cross-section composition point for one
come to node product point. column’s section must belong to the sep-
Bond between two stationary points dis- aratrix min-reflux region and the other
tillation line (c-line at infinite reflux) that to the separatrix sharp distillation re-
comes from the point with less boiling gion for given product points and re-
temperature to the point with greater flux ratio and satisfy the material balance
boiling temperature. There should not be in feed cross-section: x f −1 ∈ Reg min,R
sep,r
any other stationary points between these andx f ∈ Reg sh,R or x f −1 ∈ Reg sh,R and
sep,s
sep,r
two points. Chain of bonds consists of sev- x f ∈ Reg min,R . There is only one possible
sep,s
eral unidirectional bonds. pair of x f −1 and x f .
Bundle of section trajectories (N ⇒ N or Joining condition at minimum reflux for
−
+
r
r
N ⇒ N or N ⇒ N ) full set of sec- split without distributed components
+
−
+
−
s
e
e
s
tion trajectories that start from the same feed cross-section composition points
point (unstable node) and end in the same must belong to the separatrix min-reflux
point (stable node). regions for given product points and re-
i, j,k
Component order region (Reg ) region
ord flux ratio and satisfy the material balance
of concentration simplex in which points in feed cross-section: x f −1 ∈ Reg min,R and
sep,r
component volatilities are in the same or- x f ∈ Reg min,R . There is only one possible
sep,s
der (K i >K j >K k ). pair of x f −1 and x f .
Condition for reversible distillation product Joining condition for split with distributed
points points x D , x B , x F , and y F are lo- components at reflux greater than min-
cated on straight line. imum feed cross-section composition
Distillation region at infinite reflux point belong to separatrix sharp distilla-
∞
(Reg ) region of concentration sim- tion regions for given product points and
plex filled with one bundle of distillation reflux ratio and satisfy the material bal-
lines (residue curves) at infinite reflux ance in feed cross-section: x f −1 ∈ Reg sh,R
sep,r
(N ⇒ N ). and x f ∈ Reg sh,R .
−
+
sep,s
Distillation subregion (Reg sub ) part of Joining condition for split without dis-
distillation region contains one bond tributed components at reflux greater
−
chain and all feed components N → than minimum feed cross-section com-
1
S →··· → N . position points belong to segments
+
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