At Ufa Oil Refinery Co., the "furnace-type" visbreaking unit was fitted out with a vacuum block for additional takeoff of residue of the following products made in it: vacuum solar oil as a component of diesel fuel, vacuum gasoil as feedstock for the G-43-107 cat cracker, and vacuum resid as a component of boiler fuel.The basic plan for the vacuum block and manufacture and installation of the vacuum tower equipped with structured packing were executed by Kedr-89 Co., the vacuum block was connected to the unit, and the heat-exchange system was designed by Bashgiproneftekhim SUE. The vacuum system was developed by Tekhnovakuum LLC and the construction and assembly work was done by VNZM trust (Ufa). Less than oneyear elapsed between development of the basic plan to start-up of the unit.The vacuum tower (see Fig. 1) is equipped with four sections of structured packing designed by Kedr-89 -VAKUPAK and KEDR -with the corresponding steam and liquid distributors, a blade device for feedstock input, and an Ultraset safety trap under the tower steam outlet connecting pipe.The residue at the bottom of the visbreaking unit tower enters the feedstock input into the vacuum tower through a transfer line without heating in the furnace. Light cuts are stripped as a result of the pressure drop.The upper circulating reflux stream (CR) together with the vacuum solar oil is taken off from the collecting tray under the first (from the top) packing section. The upper CR is returned to the tower after cooling through an injector distributor above the first packing section, and the vacuum solar oil is removed from the unit. The second packing section is the fractional distillation section and separates the vacuum solar oil and vacuum gasoil.The lower CR is taken off from the collecting tray under the third section together with the vacuum gasoil and hot reflux from the washing section. The hot reflux stream from this section is returned to the tower to the low-pressure grooved liquid distributor over the fourth packing section. The lower CR stream is returned to the tower after cooling through the injection distributor over the third packing section, and the vacuum gasoil is removed from the unit.Vacuum resid is taken off from the tower still. Feed of cooled bottoms into the still as quenching oil is provided to maintain the temperature in the still no higher than 350°C to prevent coking.
The article discusses the original design of a contact device - a centrifugal plate for heat and mass transfer processes, which implements the idea of gas-liquid interaction in a swirling gas flow and further separationof liquid from gas using centrifugal force. Numerous tests of centrifugal trays have confirmed their high efficiency, providing the lowest reduced costs and, accordingly, the maximum economic effect when used in pressurized fractionation plants.
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