Extraction of sulphuric acid by methyl diphenyl phosphate and tributyl phosphate

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Abstract

The extraction equilibria in the sulphuric acid-methyl diphenyl phosphate-water and sulphuric acid-tributyl phosphate-water systems were investigated. The activities of methyl diphenyl phosphate and tributyl phosphate were calculated in the range of aqueous 0-10M-H2SO4, with the aid of the Gibbs-Duhem relationship. The experimental data found are consistent with the formation of the [H(H2O)3(MePh2PO4)4 +] [HSO4-] complex with the equilibrium constant K = 2 × 10-3(mol/kg MePh2PO4)-1. At higher acid concentrations complete miscibility of MePh2PO4and H2SO4 is observed. At low concentrations of H2SO4, the acid is extracted by tributyl phosphate in the form of H2SO4(H2O)6(Bu3PO 4)3 with K = 20 (mol/kg Bu3Po4)-3. Some summarizing remarks on the extraction of HNO3, HCl, and H2SO4 by MePh2PO4 and Bu3PO4 are also given.

Original languageEnglish
Pages (from-to)1198-1201
Number of pages4
JournalJournal of the Chemical Society. Dalton Transactions
Issue number11
DOIs
StatePublished - 1 Dec 1973
Externally publishedYes

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