Influence of jet fuel distillation range on quality indexes

Jet fuels are obtained mainly from straight-run petroleum cuts, taken in the same ratio in which they were originally present in the crude. Therefore, the initial boiling point t i and the end point t e of the cuts give an essentially unambiguous determination of the jet fuel yield. For commercial mixed West Siberian crudes, the quality indexes of which were given in [2], the dependence of fuel yield on the cut points is shown in Fig. i, with the yield of 120-240~ in the ARN-2 apparatus being taken as 100%. The yield of jet fuel (M, %) with different cut points, relative to the indicated cut, can be calculated with adequate accuracy by the formula M=0.85(ti~--I e ) (1) The arithmetic average deviation between the calculated and experimental data is no greater than 1.76%. From Eq. (i) it follows that for jet fuel of the TS-I type, an expansion of the cut point range by 10~ corresponds to an 8-9% increase in yield. In our experimental studies*, cuts with different temperature ranges (between 600C and 300~ were obtained from mixed West Siberian crudes in ARN-2 apparatus. These cuts were tested by standard methods to determine the density (02o, kg/m3), initial crystallization temperature (ticr, ~ content Of aromatic hydrocarbons (A, % by weight), lower heat of combustion (Q, kJ/kg), and closed-cup flash point (tfl , ~ From these data, graphs were plotted for the quality indexes as functions of t i and t e (Figs. ing these relationships were determined