The viscosity of acetone‐water solutions up to their normal boiling points

Abstract

The viscosity of acetone-water liquid solutions has been measured over the entire concentration range at temperatures from 20°C. to generally within 1' to 10T. of the normal boiling point. A capillary suspended-level viscometer was used, and the authors estimate that the results are accurate to f0.20/,. Both kinematic and absolute viscosities are given, and the results have been extrapolated to the boiling point of the solutions. The calibration of the Cannon-Ubbelohde viscometer is discussed in detail.One of the aims of Research Project 1, Tray Efficiencies in Distillation Columns, sponsored by the American Institute of Chemical Engineers, was the determination of the effect of the physical properties of binary liquid systems on distillation efficiency. The viscosity of the system is required for the calculation of the liquidphase diffusivity by t h e method of Wilke and Chang (18) t o the viscometer, for example, corrections for surface-tension effects or for kinetic-energy effects. I n addition, not until recently (15) has there been available an accurate value for the viscosity of water for use as a primary standard for viscosity. With rare exseptions, viscosities of binary systems are not available at temperatures above 45°C.; for estimation of the boiling-point viscosity, an extrapolation of 15" to 60°C. would be required.This investigation was designed t o provide accurate liquid viscosity data for the acetone-water system over the entire concentration range. The investigation was carried out a t temperatures from 2OOC. t o within 1" to 10' of the boiling point of the solution, and these data allowed estimation of the boilingpoint viscosity with a high degree of accuracy. EQUIPMENT AND PROCEDURE Vircometer

Viscometric and Volumetric Properties of 10 Regular Binary Systems at 308.15 K and 313.15 K

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