By means of a procedure similar to that used for the inert gases (19) and methane (20) a reduced thermal conductivity correlation was developed for ethylene from experimental data available in the literature (2, 3, 4, 9, 13). The resulting correlation permits the prediction of thermal conductivities for gaseous and liquid ethylene in the temperature range TR = 0.4 to TR = 6.0 and for pressures up to PR = 50. For pressures below PR = 0.5 this correlation was found to apply to gaseous aliphatic hydrocarbons and their derivatives but not to cyclic compounds. For these aliphatic hydrocarbons and their derivatives the relation between thermal conductivity at atmospheric pressure and temperature is k*/k = 0.364 T.
Experimental thermal conductivities of ethylene in the liquid state and dense-phase region were compared with values predicted by the reduced-state correlation. The average deviation for thirty-six experimental points was 1.8%. Gaseous-state data at atmospheric pressure of alkanes, alkenes, alkynes, alcohols, ethers, halogenated derivatives, esters, aldehydes, ketones, amines, nitriles, and other aliphatic compounds were also compared with values predicted by this correlation. For 414 experimental points the average deviation was 1.63%.