Excess properties of the mixture bis(2-dichloroethyl)ether (chlorex) + 2,2,4-trimethylpentane (isooctane)

The excess properties of the mixture bis(2-dichloroethyl)ether (chlorex) + 2,2,4-trimethylpentane (isooctane), i.e. excess volumev^E, excess enthalpyh^E, excessGibbs energyg^E and excess heat capacityc_p^E are reported. The excess volume is small, negative on the chlorex side and positive on the isooctane side. The excess enthalpy at 293.15 K is 1 913 J mol^–1 for equimolar composition, the excessGibbs energy amounts to 1 367 J mol^–1 under the same conditions. The system undergoes phase separation below 290.47 K. Due to the nearness of the critical point,c_p^E exhibits a strong maximum at the critical composition (x_isooctane=0.508), though the basic part ofc_p^E is negative. Discussion focusses on the effects of polarity of chlorex as mixing partner, on near-critical properties, and on mixing rules of avan der Waals-type equation of state.Dedicated to Prof. Dr.K. Komarek on the occasion of his 60th birthday.