DELAYED COKING PROCESS FOR OIL RESIDUES Russian patent published in 2021 - IPC C10B55/00 C10G9/14 

FIELD: oil refining industry.

SUBSTANCE: invention relates to methods of delayed coking of oil residues and can be used in the oil refining industry. This invention relates to a method for delayed coking of oil residues, which includes preheating the feedstock, mixing it with a diluent and reheating the mixture to the coking temperature. The preheating of the feedstock is carried out in a block of heat exchangers. After heating the feedstock to a temperature of 195-250°C, 1-5% of hydrocarbons with density of 800-950 kg/m³ are added to the feed stream from a closed blowdown system to the feedstock. At the exit from the block of heat exchangers, the mixture flow is mixed with a diluent in the amount of 2-20% for the feedstock, which is used as the gas oil of the washing zone. Next, the mixture heated to a temperature of 280-330°C is sent to the lower part of the rectification column. After that the mixture is sent to the furnace for reheating to a temperature of 485-500°C, the temperature in the furnace is controlled and the temperature of the mixture at the outlet of the furnace is controlled. The heated mixture is fed into the reactor, while the vapors from the reactor, cooled to a temperature of 400-420°C by supplying quench, are sent to the zone of the rectification column, which is located above the zone of the feed mixture. According to this method, tar or a mixture of tar with a vacuum-distilled visbreaking residue is used as oil residues.

EFFECT: method of delayed coking of oil residues allows reducing energy consumption, expanding the range of the raw materials used in the coking process, and also increasing the overhaul period of a delayed coking unit for oil residues.

1 cl, 13 ex, 1 tbl, 1 dwg