Oil refining with increased output of winter diesel fuel
51EN
р.
р.
Process Description Feedstock – treated oil is fed into CDU column 1, from which vapors, light and heavy gas oil fractions, as well as bottom residue are removed. Naphtha is fed to column 1 as live reflux, intermediate steam reflux, main steam reflux from reboiler (not shown in the diagram). The light gas oil fraction is stabilized in the stripping column 2, from which winter diesel fuel is removed, as well as stabilization vapors, which mix with vapors from separator 8, forming an intermediate vapor reflux stream. Heavy gas oil fraction from column 1 is pumped by pump 3 into heat exchanger 4, heater 5 and is exposed to hydrogen-free catalytic isomerization in reactor 6. The reaction products are removed, some part is cooled in heat exchanger 4, pressure is reduced by means of valve 7 and it is separated in separator 8 into separation steam and an isomerized gas oil fraction, which is supplied for reflux to middle part of column 1.
Process features
An increase in output of winter types of diesel fuel by 50-100%
An increase in output of naphtha by 8-12 %
Gas formation (C3-C4): no more than 1.5 % by weight from heavy atmospheric gas oil