https://pubs.acs.org/doi/10.1021/acs.chas.2c00070

Evaporation Kinetics of Liquid Mixtures and Safe Handling

A simple and inexpensive method is proposed for the measurement of the evaporation rate of liquid mixtures and further estimation of the flash point. These two pieces of information are important for the appraisal of fire or explosion risks related to their handling, storage, and use, as well as for occupational health matters. The overall mass-time profiles for the isothermal evaporation of liquid mixtures show an initial constant-rate kinetic phase [revap(initial)] that can be interpreted as the arrival of volatile molecules at the liquid–gas interface as fast as evaporation takes place, thus ensuring a nearly constant surface composition. The extent of this constant kinetic phase is dependent on the fraction of the more volatile components in the liquid bulk. Besides a mechanistic interpretation of the experimental results, a regression equation was obtained between flash-point temperatures [Tf] and the corresponding logarithm of revap(initial) that is like a previously!
published relationship between the Tf of pure liquids and mixtures and their log revap(AcOBu = 1) values. This finding is of utility for the appropriate usage of liquid materials in the absence of these physical data in commercial safety data sheets.

Evaporation Kinetics of Liquid Mixtures and Safe Handling
Hazel Aragón and Julio F. Mata-Segreda
doi.org/10.1021/acs.chas.2c00070
Publication Date (Web): February 7, 2023

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