title: Estimation of Equilibrated Vapor Concentrations Using the UNIFAC Model for the Tetrachloroethylene-Chlorobenzene System.
abstract: Equilibrated vapor concentrations at 25°C of the tetrachloroethylene-chlorobenzene system were obtained in the presence of air to establish a method for estimating vapor concentrations in work environments where multicomponent organic solvents are used. The experimental data were correlated by introducing activity coefficients calculated by the UNIFAC (Universal Quasichemical Functional Group Activity Coefficient) model. There were four interaction parameters between groups in this solution system, and three had already been determined.However, the fourth parameter--the interaction parameter between ACCl and Cl-(C=C) groups--remains unknown. Therefore, this parameter was determined by a nonlinear least-squares method to obtain the best fit for the experimental data. The calculated values were found to be in good agreement with the experimental values.
authors.affiliation: Department of Environmental Management, School of Health Sciences, University of Occupational and Environmental Health, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Ishidao
authors.forename: Sumiyo
authors.initials: S
authors.lastname: Ishimatsu
authors.forename: Hajime
authors.initials: H
authors.lastname: Hori
mesh_terms: D000395:Air Pollutants, Occupational / Q000032:analysis*; D002722:Chlorobenzenes / Q000032:analysis*; D008962:Models, Theoretical; D016273:Occupational Exposure / Q000032:analysis*; D012997:Solvents; D013696:Temperature; D013750:Tetrachloroethylene / Q000032:analysis*; D014835:Volatilization
chemical_list: D000395:Air Pollutants, Occupational; D002722:Chlorobenzenes; D012997:Solvents; C031294:chlorobenzene; D013750:Tetrachloroethylene