Solvent Extraction of Phosphoric Acid with Long Chain Tertiary Amines

Stig Stenström, S Wingefors, Gharib Aly

Research output: Contribution to journalArticlepeer-review


Solvent extraction of phosphoric acid with Alamine 336 and tri-n-octylamine in toluene has been investigated. The activity of phosphoric acid is expressed as a polynomial of ionic strength and Bromley's model for electrolyte solutions is employed for calculation of ionic activity coefficients. Three species R3N (H3P04) n with n = 1, 2 and 3 in the organic phase are taken into account for explanation of the distribution equilibria. The extraction constants have been determined as log K11 = 2.05, log K12 = 3.61 and log K13 = 3.84 respectively. Aggregation and other non-ideal behaviour in the organic phase are described by letting the corresponding activity coefficient quotients be a function of the total concentration of acid in the organic phase.
Original languageEnglish
Pages (from-to)883-905
JournalSolvent Extraction and Ion Exchange
Issue number5
Publication statusPublished - 1986

Subject classification (UKÄ)

  • Chemical Engineering


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