Simultaneous viscosity and density measurements and modeling of 2-alcohols at temperatures between (291 and 353) K and pressures up to 50 MPa

Abstract

Dynamic viscosity (η) and density (ρ) were simultaneously measured for pure 2-alcohols (2-propanol, 2-butanol, 2-pentanol, 2-hexanol, and 2-heptanol) in the temperature range from (291–349) K and pressures up to 50 MPa. The measurements were performed using a new coil capillary viscometer coupled with a vibrating tube densimeter with a relative expanded uncertainty (coverage factor k=2) of 1.6% for the dynamic viscosity and 0.3% for the density considering the impurities of the compounds. The reliability of the equipment used was verified by determining and comparing the dynamic viscosity and density of ethanol with the data published in the international literature, resulting a maximum deviation of 10 μPa s for viscosity and 0.40 kg m−3 for density. Experimental dynamic viscosity and density data were successfully represented by two empirical models, obtaining good results in agreement with the uncertainty (maximum deviation of 1.3% and 0.15% for dynamic viscosity and density, respectively). From the experimental density data, the isothermal compressibility and isobaric thermal expansivity were determined.