Page 361 - Distillation theory

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CB644-IND CB644-Petlyuk-v1 March 16, 2004 17:0

Index 335

sequences evolution of rectifying section region of,
alternative, systematic identification of, 115
269–271 intermediate section two-feed column
chief criterion for best, 263 trajectories of, 178
defined, 40 possible splits for, 26
see also separation flowsheet synthesis product composition regions of, 44–45
sequencing. See separation flowsheet synthesis reversible distillation trajectories of,
sharp distillation region, 126 175–176
sharp split separatrix regions, 123–125, 326–327 at sharp and quasisharp splits, 182–183
simple iteration, 227 section trajectories of, 180
simplex of dimensionality, 3 trajectory bundles under infinite reflux of,
six-component mixtures, 17 27
splits McCabe-Thiele plots for components of,
direct, 25, 152–154 278
feasibility of, 40, 48, 73, 177–178 Reg , Reg sub , and Reg simp of, 5–8, 15, 16, 62,
∞
feasible at R =∞ and N =∞,57–71 63
indirect, 25 phase equilibria with two binary azeotropes,
intermediate, 25–26, 221 308
quasisharp, 137–138, 221 possible product regions of, 284
semisharp, 40 product points and trajectories under
separability, necessary condition for, 124–126 minimum reflux, 30
sharp, 25–26, 182, 326 regions of order of components of, 12
with distributed component, 221 reversible distillation
without distributed components, 221–222 extractive, diagrams of, 97–100
zeotropic mixture, 41 intermediate section diagrams, 101
stable nodes, 6 semi-sharp, region boundaries, 104
state task network, 269 sharp, section trajectories, 84, 90
stationary points trajectory bundles, 84–86
local characteristics, 7 separation flowsheet preferability regions for,
residue curve bundle, 6–7 267–268
saddle point S,27 sharp extractive distillation of, 181–185
+
stable node N ,27 simple column sequences, 268
type of, defining, 7 structures and structural matrices of, 11
unstable node N ,27 subregions of distillation under infinite reflux,
−
structural matrices, 10–12, 55–57 51
tie-lines for, 50
tangential pinch, 24, 136, 156–157, 327 types of, 8
tear-off points, 86, 121, 327 types of stationary points of, 6
tear-off region, 327 zones of constant concentration locations in
thermodynamic efficiency equation, 79 columns of, 31
thermolability, 312 tie-lines
three-component (ternary) mixtures interconnected, 26
α-lines of, 12 liquid-vapour, 5, 41–42, 50
α-surfaces of, 12 total condenser, 21
autoextractive semi-sharp distillation column trajectory bundles
schematic, 308 defined, 26–27
complex column schematics, 196 stationary points of, 27, 77, 165
concentration simplex of, 21 under finite reflux, 27–29
connectedness condition of, 53 under infinite reflux, 26–27
dependencies K−x in, 14 see also section trajectory bundles
distillation region of, 8 trajectory of distillation. See distillation
extractive distillation, conditions for trajectories
separability in, 188–190 trajectory tear-off
heteroextractive distillation of, 209, 210–211 defined, 327
ideal sharp distillation regions and, 123–124
auto-extractive reversible distillation structural conditions of, for top/bottom
column schematic, 97 sections, 120–123
intermediate section trajectories, 98 for multicomponent mixtures, 282–283