Orthobaric Liquid Densities of Normal Butane from 135 to 300 K as Determined with a Magnetic Suspension Densimeter

  • W. M. Haynes
  • M. J. Hiza
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 21)


Of the principal constituents of natural gas, normal butane is the first in the series of paraffin hydrocarbons that has a triple-point temperature significantly higher than the normal boiling point (112 to 115 K) of methane-rich liquefied natural gas (LNG). Unlike isobutane, with a triple-point temperature (113.6 K) near the normal boiling point of methane-rich LNG, normal butane freezes at the relatively high temperature of 134.8 K. Thus any estimate of the contribution of n-butane content to the molar volume (or molar density) of LNG requires a relatively long extrapolation into the subcooled liquid region of n-butane. It is also known that n-butane is the first in the series of paraffin hydrocarbons exhibiting geometrical isomerism, with nearly instantaneous equilibrium, which contributes to the temperature dependence of the molar density [1–5]. It follows that an analytical expression that provides the most reliable means of extrapolating n-butane densities into the subcooled liquid region cannot be based on correspondence alone, but must be based on extensive and accurate data above the triple-point temperature.


Liquid Density Barium Ferrite Normal Boiling Point Molar Density Paraffin Hydrocarbon 
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Copyright information

© Springer Science+Business Media New York 1960

Authors and Affiliations

  • W. M. Haynes
    • 1
  • M. J. Hiza
    • 1
  1. 1.Cryogenics DivisionInstitute for Basic StandardsBoulderUSA

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