EXCESS DYNAMIC VISCOSITY AND EXCESS VOLUME OF N-BUTYLAMINE+1-ALKANOL MIXTURES AT MODERATELY HIGH-PRESSURES

Experimental measurements are reported for the dynamic viscosity and the density of the four binary mixtures of n-butylamine with methanol, ethanol, 1-propanol, and 1-butanol. The measurements were conducted at 25-degrees-C and in a pressure range from atmospheric to 720 bar for the dynamic viscosity and from atmospheric to 340 bar for the density. The self-centering falling body viscometer used is described in detail. Calculated excess volumes, compressibilities, and excess viscosities are also reported. The systems studied, besides self-association, exhibit very strong cross-association due to the strong hydrogen bonding between the hydroxyl and the amine groups. As a consequence of this strong intermolecular association all four systems studied exhibit relatively large negative excess volumes while the first two systems with the lower alkanols exhibit pronounced maxima in the excess viscosity.