New convenient vapor pressure-temperature correlation for some aliphatic hydrocarbons
DOI:
https://doi.org/10.20450/mjcce.2013.105Keywords:
Vapor pressure, vapor pressure- temperature equations, aliphatic hydrocarbonsAbstract
New empirical equations for correlating temperature dependence of vapor pressure for C6-C20 aliphatic hydrocarbons are proposed:
ln(VP) = k1·T/(k2+T)
where, VP – vapor pressure, T – temperature, k1 – asymptotic maximum vapor pressure, and k2 – temperature at which the vapor pressure has half of its maximum value.
Descriptors k1, k2 and k1/k2 have physical meaning and are unique for a given liquid. This “uniqueness” can be exploited for quantitative description of vapor pressure-temperature curve. The equation given above can be transformed algebraically into other convenient forms for plotting experimental data such as:
T/ln(VP) = intercept + slope·T
k1 = 1/slope; k2 = intercept/slope
These derived descriptors can be utilized for evaluation and comparison of properties of different liquids and liquid mixtures and can serve as additional parameters for analysis of liquid hydrocarbon-based fuels for internal combustion engines.
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