Viscosity and density of isomeric butanol/water mixtures as functions of composition and temperature

Abstract

Viscosity and density of 27 binary mixtures of sec-, iso-, and tert-butanol with water were measured at 273 ≤ T/K ≤ 353 and the results summarized using polynomials. At fixed T the density depended strongly but monotonically on mole fraction. The excess volume VE was large and negative. In H2O/tert-butanol as T increased VE increased, while in H2O/sec- or iso-butanol VE decreased with increasing T. The excess viscosity was large and positive in all cases.