Abstract
The extraction of sulphuric acid using binary extractants is reported. The binary extractants studied consisted of equimolar mixtures of the organophosphorus acid extractants D2EHPA, PC-88A and Cyanex 302 and the amine-type extractants Alamine 336, Aliquat 336, Adogen 283 and Primene JMT. The most efficient loading from a solution initially containing 75 g/l sulphuric was obtained at an organic to aqueous phase volume ratio of 5:1 using a 50% solution of the binary extractant in Shellsol AB. The best binary extractant in terms of extraction efficiency was Alamine 336/D2EHPA. A McCabe-Thiele construction shows that relatively few equilibrium stages are required for efficient extraction. The efficiency of stripping the loaded organic phases with water is poor and the use of a basic stripping solution to increase the stripping efficiency may be necessary.
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