OIL REFINING METHOD Russian patent published in 2015 - IPC C10G7/00 C10G7/06 

FIELD: oil-and-gas industry.

SUBSTANCE: method comprises the passing of heated raw materials through heat exchangers and a furnace into a complex topping unit fitted with lateral stripping sections with supply into the bottom of sections and a complex topping unit of heated flows, withdrawal from the top of the complex topping unit of light petrol fraction and its supply after heating into a stabiliser tower with release of gas and stable light petrol fraction, side streams through stripping sections - heavy petrol, kerosene and diesel fractions and from the bottom of the complex topping unit of fuel oil, supply of fuel oil after heating in the furnace into the vacuum column with lateral withdrawal of diesel fraction, light vacuum gasoil using a circulating irrigation and from the bottom of the vacuum column - tar, using the circulating irrigation in the complex topping unit and supply of the heated flow into the bottom of the vacuum column, meanwhile the raw materials after heating in heat exchangers are separated into two flows, the flow, larger by quantity, is heated in the furnace and is supplied to the feeding zone of the complex topping unit, and smaller without heating is supplied between the supply of the larger flow and withdrawal of diesel fraction, the complex topping unit contains two circulating irrigations, the heated flows are supplied to the bottom of stripping sections which are vapours after evaporation of light hydrocarbons from the residues of the stripping sections, into the bottom of the complex topping unit - heated gas from the stabilisation column where the reflux is withdrawn, from the fuel oil before its heating in the furnace the light hydrocarbons are evaporated at the pressure lower than the pressure in the complex topping unit and they are supplied as heated flow into the bottom of the vacuum column, the heavy vacuum gasoil is withdrawn from the first plate of the vacuum column located above the supply of raw materials into the vacuum column and supplied for mixing with fuel oil liquid phase, after that the obtained after mixing flow is heated in the furnace and is supplied into the vacuum column as a raw material, the lateral withdrawal of diesel fraction of the vacuum column is taken as a top circulating irrigation, and the light vacuum gasoil - as a lower one.

EFFECT: invention allows to lower energy consumption and to avoid formation of drains of acidic water, to increase withdrawal of vacuum gasoil and to decrease the level of decomposition of fuel oil in the furnace.

1 dwg, 1 tbl