Summary
The Stefan-Winkelmann diffusion technique has been used to determine vapor pressures of high boiling point compound-solvents mixtures. Data are reported at a temperature of 67°C for the mixtures polyphenyl ether (6 rings) — benzene and carbowax 1500 — benzene and at a temperature of 100°C for the mixtures polyphenyl ether (6 rings) — toluene and tricresylphosphate-toluene. The range of concentration is only limited by the appearance of a solid phase, and results are in good agreement with those determined by vapor pressure osmometry.
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Abbreviations
- A:
-
Vapour source
- B:
-
Flowing gas phase
- c:
-
Concentration, g-mol/cm3
- DAB :
-
Molecular diffusion coefficient, cm2/s
- hi :
-
Total interface depth, cm
- K:
-
Parameter defined by equation (6), dimensionless
- I:
-
Polymer or high boiling point compound
- MA :
-
Molecular weight
- NAZ :
-
Molar flux, g-mol/(cm2) (s)
- PA :
-
Partial pressure at the interface, atm
- P:
-
Total pressure, atm
- R:
-
Gas constant, (atm) (cm3) / (°K) (g-mol)
- T:
-
Temperature, °K
- t:
-
Time, s
- YA :
-
Molar fraction at the interface, dimensionless
- zo :
-
Initial interface depth, cm
- zi :
-
Drop of the interface depth, cm
- z:
-
Interface position
- ρA :
-
Density of the liquid phase, g/cm3
References
ALVAREZ,R.: Ph. D. Thesis, University of Oviedo (1977)
AMBROSE,D.: Exp. Thermodyn. 2, 607 (1975)
COCA,J., et al.: Unpublished work (1979)
CRIDER,W. R.: J. Am. Chem. Soc. 18, 924 (1956)
MARRERO, T. R. and MASON, E. A.: J. Phys. Chem. Ref. Data 1, 1 (1972)
MATO, F. and BUENO, J. L.: Anal. Quim. 73, 108 (1977)
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Coca, J., Bueno, J.L. & Alvarez, R. Evaporation of polymer-solvent mixtures. Polymer Bulletin 1, 459–464 (1979). https://doi.org/10.1007/BF00255708
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DOI: https://doi.org/10.1007/BF00255708