Abstract
The present work describes a method to develop a simulation model for dearomatisation of the straight-run fraction that boils in the range 140–240°C (also called Aviation Turbine Fuel fraction) of Bombay high crude (India—offshore). Sulpholane was used as a solvent to extract aromatics from this fraction. A mass spectrometric analysis of the ATF fraction identified six hydrocarbon types; each of these was represented by one or more components. The group contribution model, UNIFAC, has been investigated for the prediction of the multicomponent liquid—liquid equilibria. The compositions of the extract and raffinate phases, thus predicted, compare closely with single stage experimental data. Multistage countercurrent extraction calculations have also been carried out using the above model and checked satisfactorily against experimental data that were available on a 27 mm-diameter packed laboratory extraction column. It has been shown that the representation of ATF fraction by model hydrocarbons, together with the equilibria predictions by UNIFAC, form a sufficiently accurate data base for the simulation model.
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