Page 234 - Gas Adsorption Equilibria

220 Chapter 4

The quantity is the compressibility factor of the gas
mixture which today in fairly wide ranges of pressure and temperature is
known for many industrial gas mixtures [4.19], [4.20]. The masses of the
sorptive gas components in adsorption equilibrium can be
calculated from gas density measurements by the buoyancy of a sinker
coupled to the magnetic suspension balance, i. e. the equation

Here is a measured quantity coming from the microbalance readings, cp.
Sect. 2.2, and indicate mass and volume of the sinker. As the density of
the sorptive gas now is a known quantity, the extensivity relation

with

provides an algebraic equation for It can be coupled with the EOS
of the sorptive gas

Solving (4.66-4.68) for we get

where one has the identity for for i = 2). Equations
(4.69) still include the unknown mass concentrations
of the sorptive gas. These
parameters can be calculated iteratively from the known gas density via
the EOS (4.68) which can be written as