Page 64 - Adsorbents fundamentals and applications

REFERENCES 49

H enthalpy
k Boltzmann constant; Henry’s constant
K Henry’s constant
M mass
n amount adsorbed in moles/g
N, Avogadro number
P total pressure
P 0 saturation vapor pressure
q amount adsorbed, usually in mmol/g
q t total amount adsorbed
q m monolayer or saturated amount adsorbed
Q heat of adsorption; quadrupole moment
r pore radius; distance of separation
R gas constant
S sorbent selectivity parameter
T temperature
v molar volume
V amount adsorbed in volume (STP)/g
monolayer amount adsorbed
V 0
molar volume of adsorbate
V m
limiting volume of adsorbed space (= micropore volume)
V O
W working capacity ratio
X mole fraction in adsorbed phase
Y mole fraction in gas phase
α polarizability; adsorption constant (= sticking probability);
selectivity ratio
β desorption constant; affinity coefficient; or parameter defined by Eqs. 3.51
and 3.55
δ mean distance of each movement
ε potential energy field over surface; effective bond energy
ε AB pairwise interaction parameter
λ ratio of sticking probabilities
µ chemical potential; permanent dipole
ν vibrational frequency of the bond
π spreading pressure
θ fractional surface coverage
ρ density

REFERENCES
Ackley, M. W. Multilayer Adsorbent Beds for PSA Gas Separation. EP 0875279A2,
(1998), to Praxair.
Ackley, M. W., Stewart, A. B., Henzler, G. W., Leavitt, F. W., Notaro, F., and Kane,
M. S. PSA apparatus and process using adsorbent mixtures. U.S. Patent 6,027,548
(2000), to Praxair.