DIFFUSION COEFFICIENTS OF SOME ORGANIC AND OTHER VAPORS IN AIR

Diffusion coefficients of 147 organic and other vapors diffusing into air have been determined at 25 °C and 760 mm. These values have been compared with the calculated figures from nine prediction methods. Approximately 75% and 70% of the diffusion coefficients calculated by the Chen and Othmer, and Wilke and Lee equations, respectively, were within ±5% of the mean observed values. The Hirschfelder, Bird, and Spotz equation is satisfactory for application to high molecular weight acids, alcohols, and esters. The other six equations have limited value for the estimation of diffusivity of the vapors of liquids into air. © 1968, American Chemical Society. All rights reserved.