Abstract  Henry's constants of toluene, ethylbenzene (EtB), 1,2,4-trimethylbenzene (TMB), and hexane in di-2-ethylhexyl phthalate (DEHP), diisoheptyl phthalate (DIHP), and diisononyl phthalate (DINP) were determined experimentally applying a dynamic method, at temperatures ranging from (293.15 to 373.15) K and at 1 atm. The logarithms of Henry's constants were fitted as linear functions of the inverse of absolute temperature (thanks to equations similar to the van't Hoff equation). These equilibrium data were predicted with a mean relative deviation of 11 % by the modified UNIFAC thermodynamic model of solution.

Abstract  Density and kinematic viscosity at temperatures from 288.15 K and 358.15 K and refractive indexes from 288.15 K and 323.15 K were measured for three esters: bis(2-ethylhexyl) adipate, tris(2-ethylhexyl) trimellitate, and diisononyl phthalate. Parameters for models fitting the experimental pure component data are reported.

Abstract  The water solubilities, octanol:water partition coefficients, and vapour pressures of a variety of commercial phthalic acid esters (several of which were mixtures) were determined by the EPA-recommended procedure, partition method and HPLC method, and gas saturation method respectively. These procedures, which had been developed for pure compounds, were appropriate for the measurement of solubilities in excess of about 100 ug per litre, and of log Kow of up to 5. For vapour pressure measurements, the range was limited by such factors as time available for the experiment, and the effect of impurities. It was concluded that these methods should be adequate for the assessment of most industrial chemicals, and that mixtures whose components had similar physical properties could be treated essentially as pure compounds.