FIELD: petroleum processing.
SUBSTANCE: method consists in distillation of petroleum feedstock on rectification column to produce bottom residue, distillate vapors, and at least one side-cut distillate. Circulating reflux liquid is likewise withdrawn from rectification column below side-cut distillate exit level, which is cooled and returned into rectification column above its exit level. Tapped side-cut distillate is passed to stripping column, from bottom part of which liquid fraction of side-cut distillate is discharged and, from top part thereof, side-cut distillate are withdrawn to be then ejected and returned into rectification column. Circulating reflux is fed as ejecting medium into liquid-gas jet apparatus, by means of which side-cut distillate fraction vapors are pumped out of stripping column and then condensed in liquid-gas jet apparatus. Mixture formed therein is directed to rectification column as circulating reflux liquid below side-cut distillate exit level. Installation for production of petroleum fraction comprises rectification column provided with petroleum feed supply lines and lines for withdrawal of vapors from top part of rectification column, withdrawal of bottom residue, withdrawal of circulating reflux liquid, supply of circulating reflux liquid into rectification column, and at least of one line to withdraw side-cut distillate. In addition, installation comprises stripping column, pump, and heat exchanger/cooler. Pump entry is connected to line for taking off circulating reflux liquid from rectification column and circulating reflux liquid supply line is connected to rectification column above aforesaid circulating reflux liquid takeoff line and below side-cut distillate withdrawal line. The latter is linked to stripping column provided with conduit to withdraw liquid fraction of side-cut distillate and conduit to withdraw vapors of light fractions of side-cut distillate. Installation is further provided with liquid-gas jet apparatus. Pump exit communicates with liquid medium inlet in liquid-gas jet apparatus through heat exchanger/cooler. Conduit for withdrawal of light fractions of side-cut distillate from stripping column is linked to gas inlet in liquid-gas jet apparatus, which, through mixture exit, communicates with circulating reflux liquid supply line or with rectification column below side-cut distillate discharge line. In another embodiment of installation, pump entry is connected to line for taking off circulating reflux liquid from rectification column. In this case, installation is also provided with liquid-gas jet apparatus, pump to supply ejecting medium, and vessel. Conduit to withdraw vapors of light fractions of side-cut distillate from stripping column is connected to gas inlet of liquid-gas jet apparatus, which, through liquid medium inlet, is connected to ejecting medium supply pump and, through mixture outlet, to vessel, which communicates with circulating reflux liquid supply line or with rectification column below side-cut distillate discharge line. Ejecting medium supply pump entry is connected to vessel and pump exit communicates through heat exchanger/cooler with liquid medium inlet in vessel and/or with ejecting medium supply pump entry.
EFFECT: reduced power consumption and improved quality of petroleum products from rectification column side-cut distillates.
6 cl, 2 dwg
