Page 26 - Separation process engineering

partial molar enthalpy of component i in vapor on stage j, J/kmol

height of tank, m

H t,OD

overall height of a transfer unit for mass transfer driving force in concentration
units, Eq. (16-83a analog), m
H G

height of gas phase transfer unit, ft or m

H L

height of liquid phase transfer unit, ft or m
H OG

height of overall gas phase transfer unit, ft or m

H OL

height of overall liquid phase transfer unit, ft or m
HETP

height equivalent to a theoretical plate, ft or m
HTU

height of a transfer unit, ft or m
j , j H
D
j-functions, Eqs. (15-50)

J
A
flux with respect to molar average velocity of fluid

k , k 2
1
empirical constants, Eq. (13-63b)
k B

Botzmann’s constant, J/k

k conduction

thermal conductivity, J/(ms K)

individual mass transfer coefficients in liquid and vapor phases, see Table 15-4

k c

mass transfer coefficient with concentration driving force, m/s, Eq. (15-25b)
k′ y

mass transfer coefficient in concentrated solutions, Eq. (15-32f)

k , k y
x
individual mass transfer coefficient in molar units