Page 118 - Applied Process Design For Chemical And Petrochemical Plants Volume II
P. 118
Distillation
I$' = Second derivative function im = Immiscible liquid
wj = Function in Underwood's Algebraic method for j = Specific components in a system or mixture
minimum reflux ratio 1 = Ik = Light key component; or light or low boiling
B = Fugacity coefficient component in mixture
@ = No. phases from phase rule lh = Refers to light component referenced to heavy
component
LK = Light key component
Subscripts L = Liquid, Scheibel-Montross method only; or com-
ponents lighter than light key
a, b, c, etc. = Specific components in a system or mixture M = min = Minimum
Avg, Av = Average m = No. trays in stripping section; or tray number
B = Any consistent component in bottoms product n = No. trays in rectifymg section; or tray number
B = b = Bottoms o = Initial conditions; or i; or operating condition
b = Exponent in Winn's relative volatility equation pr = Pinch condition in recweng section
D = Any consistent component in condensed over- ps = Pinch condition in stripping section
head product or distillate P = For packed towers
eff = Effective w = Relates to bottoms or pot liquor, or kettle
E' = Feed bottoms
Fi = Feed, j r = Rectifylng section; or component to which all the
F, = Intermediate feed, Scheibel-Montross method relative volatilities are referred
FL = FH = All mol fractions lighter than light key in s = Steam, or stripping section of column
feed, Scheibel-Montross method t = Top, or total
FHK = Heavy key in feed T = For tray towers
FLK = Light key in feed v = Vapor
HK. = h = hk = Heavy key component 1 = Initial, steam distillation
H = Components heavier than heaw kev 2 = Remaining, steam distillation
,
I
h = Heavy, or heavy or high boiling component in 1, 2, 3, etc. = Tray numbers; or specific components in a sys-
mixture; also heavy key component tem or mixture
i = Any component identified by subscripts 1,2,3, (') = Superscript, heavy key component or least
etc, or by a, b, c, etc.; or initial condition, i volatile
