Evaluation of thermal analysis equipment for the determination of vapor pressure and heat of vaporization |
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Authors: | Gerald P MorieTroy A Powers Clyde A Glover |
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Institution: | Research Laboratories, Tennessee Eastman Company, Division of Eastman Kodak Company, Kingsport, Tennessee 37662 U.S.A. |
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Abstract: | A rapid, relatively simple method for determining vapor pressure and heat of vaporization on small amounts of organic compounds is described. A DuPont 900 differential thermal analyzer (DTA), a Perkin—Elmer Model DSC-1B differential scanning calorimeter (DSC), and a Thomas—Hoover (TH) melting point apparatus were evaluated in this work. Vapor pressure data for a wide variety of organic liquids were obtained by measuring the boiling points of the liquids at pressures ranging from 20 to 735 torr. A computer was used to rapidly plot the experimental data. The average deviations of boiling points from the literature values were 2.3°C for the DTA 1.2°C for the DSC, and 1.5°C for the TH. The vapor pressure data were used to solve the Haggenmacher equation for heat of vaporization (ΔHv). The deviations of the experimental values for ΔHv. from the literature values were 5.5%, 8.3%. and 3.3% for the DTA, DSC, and TH methods, respectively. |
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