METHOD FOR PRODUCING A COKING ADDITIVE BY RETARDED COKING OF PETROLEUM RESIDUES

摘要

The invention relates to the field of petroleum processing, in particular to producing a coking additive in a carbon coking charge, and is directed towards reducing the content of sulphur in the end product. The method consists in that the initial stock is fed after heating into an evaporator for mixing with heavy gas oil as recycle and for forming a secondary stock, which is heated in a reaction furnace and fed into the coking chamber where a coking additive and vapour-liquid products are formed, and the latter are fractionated in a rectification column, forming gas, gasoline, light and heavy gas oils and bottoms. According to the invention, the bottoms are mixed with a metal oxide and fed into the coking chamber simultaneously with the heated secondary stock, wherein the initial stock is heated to a temperature of 250-390°? and the secondary stock to a temperature of 450-480°?, and the recycle coefficient is a maximum of 1.2. It is expedient to use calcium oxides and/or magnesium oxides as the metal oxides.