PARTITION OF NITRIC ACID BETWEEN WATER AND SOME BINARY ORGANIC MIXTURES

The partition of nitric acid between water and binary mixtures of organic solvents, one component of which has always been TBP, the other DBE, MIK, or AA, has been investigated. The distribution coefficients in all three investigated systems are found between the distribution coefficients of pure solvents. The partition curves for various organic phase composition were found in all three cases to intersect at defined high acidity of aqueous phase. Some interesting facts result from this: a) in each investigated system there is a defined acidity of the aqueous phase (at equilibrium), where the distribution coefficient of nitric acid has constant value regardless of the organic phase composition; b) with a defined organic phase composition, the distribution coefficient has in each investigated system a constant value regardless of the aqueous phase acidity. In TBP-DBE system, the distribution coefficient attains this constant value at 33 mol% TBP, while in systems with TBP-AA and TBP-MIK it is attained at 25 mol% TBP. (auth)