REVISITING THE PITZER EQUATIONS IN NON AQUEOUSE PHASE, A COMPARATIVE STUDY

The modelling purposes are achieved based on the solvent activity data correlation without ion pairing by using the Pitzer and Simonson (PS), Pitzer and Mayorga (PM) and Pitzer Simonson Clegg (PSC) equations. The solvent activity is correlated at 298 K for the systems, LiClO4+acetonitril, LiClO4+methanol, LiClO4+ ethanol, LiClO4+acetone, LiClO4+2-propanol, LiClO4+DME, LiClO4+DMC, Et4NBr+ethanol, Pr4NBr+ethanol, Bu4NBr+ethanol, BPBr+ethanol, Pr4NBr+ 2-propanol, Bu4NBr+2-propanol, LiBr+acetone, Bu4NBr+acetone, Bu4NClO4+acetone. We do show that Pitzer and Simonson equation is not consistent with these investigated experimental data. It can be concluded that, according to the regression results for studied systems, better correlation of solvent activity data without ion pairing is obtained for the PM and PSC approach. The limitations of the models are discussed.

Keywords:

Pitzer , Activity Coefficient , non aqueous , Electrolyte