![]() ![]() The present work was done to correct some inaccuracies in the previous data, to provide data where none were available, and to provide a series of consistent viscosity data all obtained with the same type of viscometer, within the limits of 0" to 100" C., and 0 to 100% glycerol concentration. cm., a t 30' C., was measured by Bridgman (6). The viscosity of pure glycerol a t pressures up to 12,000 kg. Tammann and Hesse (17) measured the viscosity of 99.5% glycerol a t temperatures from -42' to -4.2" C. Green and Parke (11) measured the viscosities of glycerol solutions at temperatures from 0" to -40" C., within the limits of the freezing points of the solutions. Vand (Ill), using Ostwald viscometers, determined the viscosity of glycerol solutions of 98.4 and 99.6% concentrations a t ten temperatures from 80" to 167" 6. Mtiller ( I C ) published viscosity values for water and five concentrations of glycerol at temperatures from 17" to 90" C. ![]() Sheely (16), using a viscometer of the type described by Bingham and Jackson (4),in which pressure on the liquid was controlled by a regulated air supply, made very careful measurements of the viscosity of glycerol solutions of 0 to 100% concentrations and a t the temperatures of 20", 22.5", 25", 27.5", and 30" C. There are a number of inconsistencies in the at)ove d a t a, particularly in the regwn of tempcratureq ahovc 70" C. Cocks (9) combined other published data with those published by Darke and Lewis and addrd some original data obtained with a standard Redwood viscometer to make a compilation covering most of the points from 1' to 100" C., and from 0 to 99% of glycerol. They published their data together with the relative viscosity data of Herz and Wegner to make a comprehensive tabulation. They did not record the specific gravities of their solutions, nor did they state how the viscosity measurements were made. Darke and Lewis (10) measured the relative viscosity of glyceiol solutions of 10 to 92% concentration a t 1' C. The hydrostatic head was increased by a supplementary tube attached to the capillary when the more viscous solutions were used. and a length of 21.991 cm., with square ends. The capillary of their viscometer had a diameter of 0.6180 mm. Archbutt and Deelev (2) made careful viscosity measurements of glycerol solutions a t 20' C. Their results were published in terms of both relative and absolute viscosity. Herz and Wegner (12) measured the viscosity of glycerol solutions of 10 to 92% concentration a t temperatures From 10' to 80' C. temperature range using a single type of viscometer. However, there has been no extensive study of aqueous glycerol solutions over 0" to 100" C. 'SERE have been several studies of glycerol viscosity for limited ranges of conceriti ations and temperatures. They also make i t possible to use aqueous glycerol solutions as viscosity standards over a wide range of viscosity and at temperatures from 0' to loo" a=. The data will be useful in the design and use of glycerolhandling equipment. The viscosit? data reported here were obtained with a single type of viscometer over the entire range of 0" to 100' C. As a result there are gaps and inconsistencies in the data. Different types of viscometers were used. and 0 to 100% concentration have been reported by various authors, each working within limited temperature or concentration ranges. Viscosity data for aqueous gl>cerol solutions in the range of 0" to 100" C. OBERSTAK T h e Miner Laboratories, Chicago 6, I l l. Viscosity of Glycerol and Its J d Aqueous So J. H., and Lacey, W.N., "Thermodynamic Properties of the Lighter Paraffin Hydrocarbons and Nitrogen," A.P.I., 1950. P., "Theorie der Verdamgfung und Verflllssigung von Gemischen und der Fraktionierten Destillation," Leipzig, J. H., "Volumetric and Phase Be- havior of the Prouene-Prouane Svstem." to be Dublished. September 1951 INDUSTRIAL AND ENGINEERING CHEMISTRY Rillman, G. ![]()
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