POSSIBLE PRECURSORS AND PRODUCTS OF DEEP HYDRODESULFURIZATION OF DISTILLATE FUELS .1. THE THERMODYNAMIC PROPERTIES OF DIPHENYLSULFIDE AND DENSITIES AND REVISED PROPERTIES FOR DIBENZOTHIOPHENE

Measurements leading to the calculation of the standard thermodynamic properties for gaseous diphenylsulfide (Chemical Abstract registry num ber [139-66-2)] are reported. Experimental methods included combustion calorimetry, adiabatic heat-capacity calorimetry, vibrating-tube dens itometry, comparative ebulliometry, inclined-piston-gauge manometry, a nd differential-scanning calorimetry (d.s.c.). Critical properties wer e estimated for diphenylsulfide. Standard molar entropies, standard mo lar enthalpies, and standard molar Gibbs free energies of formation we re derived for (C6H5)(2)S at selected temperatures T between 298.15 K and 700 K. Densities along the saturation line of dibenzothiophene (CA registry number [132-65-0] are reported for the temperature range 398 < (T/K) < 548. Revised thermodynamic properties for dibenzothiophene based on published results are included. (C) 1995 Academic Press Limit ed