Influence of salting-out agents on extraction of hydrochloric acid by tri-n-butyl phosphate

Obtained and analysed are the data on acid extraction by non-diluted tri-n-butyl phosphate (TBP) out of aqueous solutions of HCl-NaCl-H2O and HCl-H2SO4-H2O. The data are compared with the ones in literature. It is found that when calculating activity coefficients of aqueous solution components according to the Mukulin equation and in assumption about dominating effect of non-stoichiometric hydration of acid monosolvates on organic phase deviation from ideality, description of the extraction out of binary and triple solutions is equivalent statistically. Conclusion is made that besides the effects of the similar ion and change of distributed substance activity coefficient aqueous phase, salting-out agent effects the extraction equilibrium by changing hydration grade of organic phase components