Viscosity of the systems m-xylene, +1-propanol, +2-propanol, +1-butanol, +t-butanol

Abstract

Viscosities, η, of the systems, m-xylene, +1-propanol, +2-propanol, +1-butanol and +t-butanol have been measured for the whole range of composition at 303.15, 308.15, 313.15, 318.15 and 323.15 K. The variation of viscosities has been plotted against mole fraction of alkanols. Viscosities have been found to increase slowly up to a considerable concentration of alkanols, followed by a rapid rise of viscosities at higher concentrations. The slow rise of viscosity is attributed to dissociation of alkanols in m-xylene, while the rapid rise of viscosity is ascribed to self-association of alkanols. Excess viscosities, η^E, have been plotted as a function of mole fraction of alkanols. The curves show negative values for the whole range of composition, with minima occurring in alkanol-rich region. η and η^E have been fitted to appropriate polynomial equations. The study shows the effect of branching and chain length of alkanols on η and η^E.

Keywords:

• Viscosity
• m-Xylene
• 1-Propanol
• 2-Propanol
• 1-Butanol
• t-Butanol