Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

Nitrogen and oxygen gas solubilities were measured in benzene, divinylbenzene, and styrene at pressures up to 3.898 MPa and at 293 K, 303 K, and 313 K, because these liquids correspond to solvent, crosslinker and monomer, respectively. Gas solubilities for an equimolar mixture of nitrogen and oxygen were measured in styrene under the same experimental conditions. Gas solubilities in the liquids for a given isotherm had a linear pressure dependence and they decreased with increasing temperature. The solubility of oxygen was about 1.8 times larger than that of nitrogen in all liquids at any given temperature. Gas solubilities of equimolar mixture (N2:O2) were slightly closer to values of nitrogen than oxygen. The gas solubilities could be correlated with the forms of the Peng-Robinson equation of state to within the ARD of 1.637 and 1.310% for nitrogen and oxygen solubility by using the objective function,Sigma(x1,exp-x1,calc). The ARDs were 0.497 and 0.491% for nitrogen and oxygen solubility from Henry's law. The data and correlation allow analysis of reacting systems for the prediction of the inductive time and the oxygen or air pressure as an inhibitor in radical polymerization.