PVT study of trifluoromethane by the burnett method

PVT data for trifluoromethane were obtained by means of a three-reservoir Burnett cell. Compressibility factors corresponding to seven isotherms (0, 25, 50, 75, 100, 150 and 200°C) were obtained experimentally, encompassing pressures up to 16.5 MPa (2,400 psia). Second and third virial coefficients were calculated for these seven temperatures, and parameters for the Stockmayer potential functions were obtained. The degree of molecular association for trifluoromethane was evaluated by the procedure proposed by Lambert and coworkers. Enthalpy and entropy of dimerization were also estimated. Une cellule de Burnett a trois volumes a ete utilisee pour etablir les donnees PVT du trifluoromethane. Les facteurs de compressibilite correspondant aux sept isothermes 0, 25, 50, 75, 100, 150 et 200°C ont ete determines sur un domaine de pression s'etendant jusqu'a 16.5 MPa (2,400 psia). A l'aide de ces donnees les deuxieme et troisieme coefficients du viriel ont ete calcules en fonction de la temperature et les parametres du potentiel de Stockmayer ont ete etablis. Le degre d'association moleculaire du trifluoromethane a alors ete estime en utilisant la methode proposee par Lambert et coll. L'entropie et l'enthalpie de dimerisation ont egalement ete evaluees.

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