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Prediction of relative vapor ratios for binary mixtures applicable to industrial hygiene.

Authors
Bishop-EC
Source
NIOSH 1980 Jan; :1-148
Link
NIOSHTIC No.
00135176
Abstract
A theoretical model for predicting relative vapor ratios for solvent mixtures was tested. The model was based on the evaporation process. It combined a thermodynamic model for vapor liquid equilibrium with a mass transfer model for diffusion across a thin gas film. The difference in chemical potentials of the components in gas and liquid phases was the evaporation force used by the model. The simulation model involved the evaporation of a liquid of constant composition into a moving air stream at atmospheric pressure. Equations were derived for gas and liquid evaporation and relative vapor ratios. The model enabled determination of the constant composition mixture of the liquid by predicting operational and equilibrium relative volatility, it was not sensitive to velocity and geometry, but was dependent on diffusion. It yielded an average absolute percent error of 6.2. Vapor ratios were predicted with reasonable accuracy, but the error limits could not be determined due to the varying effect of the liquid film resistance. The author concludes that the unique features of the model are the method of predicting the activity coefficient and the elimination of geometry specific mass transfer parameters. The model is applicable to mixtures.
Keywords
NIOSH-Grant; Chemical-analysis; Chemical-properties; Physical-properties; Analytical-methods; Laboratory-testing; Fumes; Quantitative-analysis
Publication Date
19800101
Document Type
Final Grant Report
Funding Type
Grant
Fiscal Year
1980
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-00889
NIOSH Division
OEP
Source Name
National Institute for Occupational Safety and Health
State
CA
Performing Organization
University of California, Berkeley
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