Kinetics of solvent extraction of metal ions with HEDHP. III. The kinetics and mechanism of solvent extraction of Cr(III) from acidic aqueous solutions with bis-(2-ethyl hexyl) phosphoric acid in benzene

Abstract

MUHAMMAD FAKHRUL ISLAM and RANJIT KUMAR BISWAS. Can. J. Chem. 57,3011 (1979). The rate of solvent extraction of chromium(II1) from aqueous sulphuric acid solutions (containing 0.05 mol dm-3 sulphate ion and 0.25 mol dm-3 acetate buffer, ionic strength, I = 0.40 mol dm-3) with bis-(2-ethyl hexyl) phosphoric acid (HDEHP or H2Az) in benzene has been measured under various conditions. The rate of backward extraction measurement of Cr(II1) from organic phase to aqueous phase is not possible due to the inert property of Cr(II1)-DEHP chelate. The forward rate is found to be first-order w.r. [Traduit par Ie journal]

Kinetics of Solvent Extraction of Iron(III) from Sulfate Medium by Purified Cyanex 272 using a Lewis Cell

“…(16) [33] as shown below: The inverse of Eq. (14) converts the backward extraction rate Eq. (11) into the following form:…”

“…Among the various phase-contacting techniques used in the rate measurements of extraction/stripping, the shake-out method [14][15][16] and the use of highly stirred tank: AKUFVE apparatus [17] are obsolete due to the unknown interfacial area. The Hahn cell (constant interfacial area non-stirred cell) is only suitable for the investigation of the vary fast processes.…”