Experimental vapor pressures of alkyl and aryl sulfides: Prediction by a group contribution method

Experimental vapor pressures were developed for alkylsulfides (di--butylsulfide, di--sec--butylsulfide, di--hexylsulfide, di--octylsulfide, di--tert--butylmethylsulfide) and arylsulfides (ethylphenylsulfide, di--phenylsulfide, di--benzylsulfide, benzylphenylsulfide) from 1Pa to 63kPa. The vapor pressures of these compounds were also calculated using a Peng--Robinson--type equation of state. Each component was characterized by three parameters: the normal boiling temperature, the pseudocovolume and the shape parameter which are calculated by a Bondi--like group contribution method. The proposed approach yield to a good representation of the vapor pressures of the different compounds.