Chin-UNIFAC as a method for exposure of weak chemical interactions in nonelectrolyte solutions

The concept of chim-UNIFAC has been realized, i.e. the UNIFAC model was complemented with allowance made for formation of chemical compounds on the basis of the law on active masses, which is necessary for correct description of the systems containing highly polar components being able to polymerize and form chemical compounds. Data on activity coefficients for 16 binary systems solvent (A)-polar substance (B) (B=tributylphosphate (TBP), di-2-ethylhexylphosphoric acid and their complexes with uranyl, A=hexane, chloroform, CCl4, and benzeno) were processed. It is found that compounds B2 (TBP), B4 (uranyl nitrate disolvate), BA and BA2 are formed, thermodynamic formation constants of the compounds being ascertained. 15 refs., 5 figs., 7 tabs