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Binary activity coefficients from microdroplet evaporation
Author(s) -
Ray Asit K.,
Venkatraman Sankar
Publication year - 1995
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690410421
Subject(s) - volatility (finance) , relative volatility , evaporation , chemistry , activity coefficient , vapor pressure , thermodynamics , ethanol , composition (language) , binary number , component (thermodynamics) , glycerol , analytical chemistry (journal) , chromatography , distillation , organic chemistry , aqueous solution , mathematics , physics , econometrics , linguistics , philosophy , arithmetic
A method‐based on evaporation of a constant‐composition droplet containing two components that differ markedly in volatility accurately estimates activity coefficients of both components. This new technique is developed to simultaneously determine the evaporation rate and composition of a droplet from intensity peaks observed in the light scattered by the droplet. It has no upper or lower limits on the relative volatility of the system and is particularly suitable for systems containing one relatively nonvolatile component. The data on the glycerol‐ethanol system, obtained from evaporation of glycerol droplets in ethanol vapor and correlated with Margules and Wilson equations, are thermodynamically consistent. The results of this study agree with ethanol activity coefficients calculated from the total pressure vs. solution composition data previously reported.