Production method for a modifying coking additive by delayed coking of residue oil

Abstract

Methods for producing oil coke, using delayed coking, are described. A primary feed is heated and charged into a remote stripper of a rectification column, where it is mixed with heavy gasoil as a recirculant and where a secondary feed is produced, which is then heated in a reaction/heating furnace and transferred to a coking chamber, where a coking additive and vapour/liquid coking products are produced. The latter ones are fractionated in the rectification column, forming gas, benzene, light and heavy gasoil and coking bottom products. Calcium oxide/hydroxide is mixed with the secondary feed, and then mixed with heavy gasoil, before being transferred to the coking chamber. Alternatively, calcium oxide/hydroxide is added to the coking bottom products, mixed with heavy gasoil, after which the coking bottom products are either mixed with the secondary feed before feeding it into the coking chamber or they are introduced into the coking chamber directly.

What is claimed is: 
     
         1 . A method for producing a modified coking additive with delayed coking of residue oil, comprising the steps of heating and charging a primary feed into a remote stripper of a rectification column, wherein it is mixed with heavy gasoil as a recirculant, and wherein a secondary feed is produced, wherein the secondary feed is heated in a reaction/heating furnace and transferred to a coking chamber, wherein a coking additive and vapour/liquid coking products are produced, wherein the latter ones are fractionated in the rectification column, producing gas, benzene, light and heavy gasoil and coking bottom products, wherein the secondary feed, before being transferred to the coking chamber, is mixed with calcium oxide or hydroxide as a modifying additive, and mixed with heavy gasoil at a 25-35:65-75 ratio, and wherein the modifying additive is charged into the coking chamber and forms 0.5-10.0 mass % of the primary feed. 
     
     
         2 . The method according to  claim 1 , wherein the secondary feed is mixed with the modifying additive either before it is transferred to the reaction/heating furnace or after it. 
     
     
         3 . The method according to  claim 1 , wherein the secondary feed is heated in the reaction/heating furnace at 450-490° C. 
     
     
         4 . The method according to  claim 1 , further comprising the step of providing circulating irrigation with heavy gasoil of a lower part of the rectification column, wherein a quality and a quantity of heavy gasoil and coking bottom products obtained from the rectification column are controlled by varying a quantity of circulating irrigation applied to a plate of the column. 
     
     
         5 . The method according to  claim 1 , further comprising the step of spraying an upper part of the coking chamber with an anti-foaming additive. 
     
     
         6 . A method of producing a modifying coking additive with delayed coking of petroleum residues, comprising the steps of heating and placing a primary feed into a remote stripper of a rectification column, wherein it is mixed with heavy gasoil as a recirculant and wherein a secondary feed is produced, which is then heated in a reaction/heating furnace and transferred to a coking chamber, wherein a coking additive and vapour/liquid coking products are produced, wherein the latter one ones are fractionated in the rectification column and form gas, benzene, light and heavy gasoil and coking bottom products, wherein calcium oxide or hydroxide are added to the coking bottom products as a modifying additive, mixed with heavy gasoil at a ratio of 25-35:65-75, after which the coking bottom products are either mixed with a secondary feed before feeding it into the coking chamber or it is introduced into the coking chamber directly, and wherein the modifying additive introduced into the coking chamber amounts to 0.5-10.0 mass % of the primary feed. 
     
     
         7 . The method according to  claim 6 , wherein the secondary feed is heated in the reaction/heating furnace at 450-490° C. 
     
     
         8 . The method according to  claim 6 , further comprising the step of providing circulating irrigation with heavy gasoil of a lower part of a rectification column, wherein a quality and a quantity of heavy gasoil and coking bottom products obtained from the rectification column are controlled by varying a quantity of circulating irrigation applied to a plate of the column. 
     
     
         9 . The method according to  claim 6 , further comprising the step of providing circulatory irrigation of heavy gasoil in a lower part of the rectification column, wherein a quality and a quantity of heavy gasoil and coking bottom products, let out of the rectification column, are controlled by varying a quantity of circulating irrigation applied to a plate of the column.