Page 282 - Gas Adsorption Equilibria

268 Chapter 5

As the pressure measurements in oscillometric-manometric experiments only
are needed to calculate the density of the sorptive gas in a
sorption equilibrium state, it seems to be worthwhile to consider direct
measurements of for example by using the buoyancy of a sinker at a
magnetic suspension balance. Experiments of this type can be called
“oscillometric-densimetric measurements”. They can be recommended to
measure solubilities of gas mixtures in swelling (polymeric) sorbing
materials. A scheme for such measurements is sketched in Figure 5.15.
Equations to calculate the total mass of gas sorbed in the sorbent mass
and the volume of the mass are the same as those given
for oscillometric-manometric measurements in the next section (4.3).

Figure 5.15. Experimental setup for oscillometric-densimetric measurements.
MSB...magnetic suspension balance, Si...sinker for gas density
measurements by buoyancy effect.

We also would like to draw reader’s attention to the possibility to combine
oscillometric, gravimetric, and manometric measurements in a single
experiment. The schematic diagram of such an instrument is given in Figure
5.16. It basically consists of a rotational pendulum, a microbalance (two
beams as indicated in Fig. 5.16 or single beam as sketched in Fig. 5.15) and a
storage vessel for the sorptive gas. This instrument would allow cosorption