SOLUBILITY OF NAPHTHALENE IN COMPRESSED ETHANE AND NITROUS OXIDE - CORRELATION OF NAPHTHALENE-GAS SECOND CROSS VIRIAL COEFFICIENTS USING PSEUDOCRITICAL PARAMETERS

The solubility of naphthalene in compressed ethane and nitrous oxide has been measured over pressure ranges of 1-60 atm at temperatures ranging from 20°-68°C. Second cross virial coefficients representing naphthalene-gas pair interactions are evaluated from the data. It is shown that when allowance is made for the effect of quadrupole moment on the critical temperatures of quadrupolar gases, ordinary combining rules for pseudocritical parameters reduce naphthalene-gas cross virial coefficients involving five different gases to a single function of the reduced temperature. It is concluded from this that: (a) quadrupolequadrupole interactions between naphthalene and quadrupolar gases are negligible in comparison to the dispersion forces involved; and (b) that equilibrium constants for formation of acid-base complexes of carbon dioxide and naphthalene are considerably smaller than thought previously.