DETERMINATION OF THE VISCOSITY OF VARIOUS HYDROCARBONS AND MIXTURES OF HYDROCARBONS VERSUS TEMPERATURE AND PRESSURE

The dynamic viscosity eta and density rho of 10 pure substances and three binary systems were measured as a function of temperature T (298.15, 313.15, 333.15, 353.15, and 363.15 K) and pressure P (less than or equal to 100 MPa). The pure substances were toluene, p-xylene, m-xylene, o-xylene, methylcyclohexane, methylnaphthalene, decahydronaphthalene, phenyldodecane, heptamethylnonane, and tetramethylpentadecane (pristane). The three binaries were toluene + tetramethylpentadecane, toluene + methylnaphthalene, and toluene + heptamethylnonane, for molar fractions x of toluene ranging between 0 and 1. The three binaries are highly ''contrasted'' systems, i.e., systems in which the viscosities of the pure components are very different for each P, T pair. In all, 547 experimental determinations were carried out (279 experimental data for viscosity of the pure substances and 268 data concerning the mixtures: x not equal 0 and 1).