Studies on the system hydrochloric acid-water-tributyl phosphate-carbon tetrachloride

• Published in: Journal of inorganic & nuclear chemistry Vol. 30; no. 4; pp. 1019 - 1023
• Main Authors: Mitamura, R., Tokura, I., Nishimura, S., Kondo, Y., Li, N.C.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.1968
• ISSN: 0022-1902; 1878-1225
• DOI: 10.1016/0022-1902(68)80321-5

The extraction of hydrochloric acid and water into dilute solutions of tributyl phosphate (TBP) in CCl 4 has been studied, and the nature and stability of the extracted species have been determined. For TBP concentrations up to 10 per cent by volume in CCl 4 and for organic-phase hydrochloric acid concentration 0·01-0·04 M, the predominant species is TBP·H +· yH 2O … Cl −. The values of y are 0·2, 0·4 and 0·5 for 5, 7 and 10 per cent by volume of TBP, respectively. The equilibrium constant of the reaction H +(aq.)+Cl −(aq.)+ yH 2O(aq.)+TBP(org.) = TBP·H +· yH 2O … Cl −(org.) at 25° has been determined to be: log K′ = −4·65±0·04, for TBP concentrations up to 10 per cent by volume.