DELAYED COKING PROCESS
The invention relates to the field of petroleum processing, in particular to the production of petroleum coke by means of delayed coking, and is directed to increasing the service interval of the installation and the yield of distilled products for the production of motor oils. The process comprises heating the starting feedstock to a temperature of 250-430°?, feeding the heated feedstock to an evaporator for mixing with a recirculating material, namely a heavy coker gas oil, so as to form a secondary feedstock, heating the secondary feedstock to a reaction temperature of 460-510°? with subsequent coking thereof, and fractionating the light fractions in a fractionating column to give gas, benzene, light gas oil, heavy gas oil and bottoms. Prior to being fed into the coking chamber, the heated secondary feedstock is mixed with the bottoms, wherein the quality and quantity of the bottoms and the heavy coker gas oil are regulated by changing the temperature on a first tray in the lower part of the fractionating column by means of feeding the heavy coker gas oil to said tray by way of circulation refluxing, and the recircul?ting material used is heavy coker gas oil.