Journal of thermal analysis

, Volume 38, Issue 11, pp 2515–2528 | Cite as

The heat capacity of fluorinated propane and butane derivatives by differential scanning calorimetry

  • Sun -Hee Hwang
  • D. D. DesMarteau
  • A. L. Beyerlein
  • N. D. Smith
  • P. Joyner
Article

Abstract

The constant pressure liquid-phase heat capacities of 21 hydrogen containing fluorinated propane and butane derivatives and one fluorinated ether (CF3OCF2H) with boiling points ranging from -34.6° to 76.7°C have been measured to 3% accuracy by differential scanning calorimetry at 40°C. The measurements are needed to help identify alternative refrigerants and blowing agents that do not deplete the stratospheric ozone layer. The DSC method has two significant advantages for this purpose, which are:
  1. (i)

    only small samples (less than 100 mg) are required, and

     
  2. (ii)

    the instruments are available in many laboratories and can be used for the heat capacity measurement of liquids with subambient boiling points without modification or special accessories.

     

Keywords

fluorinated propane and butane heat capacity 

Zusammenfassung

Mittels DSC bei 40°C wurden die Flüssigphasen-Wärmekapazitäten für konstanten Druck von 21 wasserstoffhaltigen fluorierten Propan- und Butanderivaten und von einem fluorierten Ether (CF3OCF2H) mit Siedenpunkten zwischen -34.6° und 76.7°C gemessen. Diese Messungen dienen der Suche nach alternativen Kühl- und Treibmitteln, welche die Ozonschicht der Stratosphäre nicht mindern. Für diese Aufgabe hat die DSC-Methode zwei eindeutige Vorteile:
  1. (i)

    es werden nur geringe Probenmengen benötigt (weniger als 100 mg) und

     
  2. (ii)

    die Geräte sind in vielen Laboratorien zugänglich und können ohne Ånderungen zur Messung von Wärmekapazitäten von Flüssigkeiten mit Siedepunkten unter Umgebungstemperatur verwendet werden.

     

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Copyright information

© Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest 1992

Authors and Affiliations

  • Sun -Hee Hwang
    • 1
  • D. D. DesMarteau
    • 1
  • A. L. Beyerlein
    • 1
  • N. D. Smith
    • 1
    • 2
  • P. Joyner
    • 1
    • 3
  1. 1.H. L. Hunter Chemistry LaboratoryClemson UniversityClemson
  2. 2.Air and Energy Engineering Research LaboratoryU.S. Environmental Protection AgencyResearch Triangle Park
  3. 3.Electric Power Research InstitutePalo AltoUSA

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