Page 24 - Distillation theory

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

xxii Nomenclature

sh
[x ]or[x sh ] composition segment on first plate under or above
f f −1
feed cross section at sharp split respectively
y mole fraction of vapor phase
z mole fraction of liquid–vapor mixture
1, 2, 3 . . . components 1, 2, 3 . . . respectively
1, 2; 1,3 . . . mixtures of components 1 and 2; 1 and
3 . . . respectively
1-2, 1-2-3 . . . boundary elements of concentration simplex
12, 13 . . . binary azeotropes of components 1 and 2; 1 and
3 . . . respectively
123, 124 . . . ternary azeotropes of components 1, 2, and 3;
1, 2, and 4 . . . respectively
123, 132 . . . regions of component order

Greek and Other Symbols
ε component recovery
difference
λ eigenvalue of distillation matrix
σ excess reflux factor
∞ infinity
α relative volatility

sum
θ the root of an Underwood equation for both sections
ϕ or ψ the root of an Underwood equation for rectifying or stripping
section
η product purity
η thermodynamic efficiency
x sh or x sh composition interval on plate under or above feed
f f −1
cross section
α 12 ,α 13 ... volatility of component 1 relative of component 2, of
component 3 . . .
S
−
N ⇒ N + distillation bundle included stationary points N , S, N +
−
mixing in feed cross section
x f −1 ⇓⇒ x f
→ bond, trajectory of distillation, one-dimensional trajectory
bundle
⇒ set of all bonds (or of all distillation trajectories) of distillation
bundle
⇔ flows between sections of distillation complex
decanter

Subscripts and Superscripts

az azeotrop
ad adiabatic