Density, viscosity and excess molar volume of binary mixtures of tri-n-octylamine + diluents (n-heptane, n-octane, n-nonane, and n-decane) at various temperatures

Densities ( ρ ) and viscosities ( η ) for binary mixtures of tri- n -octylamine (TOA)   +   n -heptane, TOA   +   n -octane, TOA   +   n -nonane, and TOA   +   n -decane are determined at T (283.15, 293.15, and 303.15)   K and atmospheric pressure. The excess molar volume is calculated from the density data and is correlated by a Redlich–Kister type equation. The excess molar volume is negative for all the four systems. The results show that the volume accommodation effect is predominant in these systems. The Grunberg & Nissan equation and Fang & He equation for binary mixtures are used to correlate the experimental viscosity data. The Fang & He equation gives an average absolute deviation ( AAD %) of 0.8% for TOA with alkane mixtures, better than that of 3.8% given by the Grunberg & Nissan equation.