Heats, equilibrium constants, and free energies of formation of the acetylene hydrocarbons through the pentynes, to 1,500-degrees K

Abstract

Values are presented for the following thermodynamic properties for acetylene, propyne (methylacetylene), I-butyne (ethylacetylene), 2-butyne (dimethylacetylene), 1-pentyne (n-propylacetylene), 2-pentyne (methylethylacetylene), and 3-methyl-l-butyne (isopropylacetylene), in the gaseous state, to 1, 500 K: The heat-content function, (HO-HOo)/T; the free-energy function, (F-HOo) / T; the entropy, So; the heat content, HO-Hoo; the heat capacity, Cpo; the heat of format ion from the elements, AHjO; the free energy of formation from the elements, AFjO; and the logarithm of the equilibrium constant of formation from the elements, 10glO Kf. 1<. Equilibrium constants and concentrations of components are given in tabular and graphical form for the isomerization of the two butynes and of the three pentynes as a function of temperature to 1,500 K. Equilibrium constants are also given in tabular and graphical form for the dehydrogenation of ethane to ethylene to acetylene, of propane to propylene to propyne, of n-butane to I-butene to 1butyne, and of n-pentane to 1-pentene to I-pentyne.