Comparison of gravimetric carbon dioxide compressibility data with four cubic equations of state



Gravimetric analysis provides direct measurement of gas
phase and sample density given that they both contribute the
upthrust due to buoyancy (Archimedes’ Law). This force must
be adequately corrected in order to convert weight readings
to mass uptake in gravimetric sorption experiments. The
contribution of gas compressibility to this correction can be
significant depending on the species and operating conditions.
The present study is intended to verify whether any of four
cubic equations of state are suitable models for carbon dioxide
at pressures to 10 bars and a temperature range between
–5 °C and 30 °C.
Experimental metho