Hydrogen donor diluent cracking process

Claim 2

A process for converting heavy hydrocarbonaceous oil into lighter distilate products comprising: (a) thermally cracking said oil in the presence of a hydrogen donor solvent to produce distillate products and residual pitch; (b) recovering recycle donor solvent from said distillate products; (c) catalytically hydrotreating said recycle donor solvent and at least a part of said residual pitch; (d) combining hydrotreated recycle donor solvent and hydrotreated residual pitch with additional heavy hydrocarbonaceous oil; and (e) subjecting said combined materials to thermal cracking as in step (a).

Claim 3

The process of claim 1 wherein all of said residual pitch is catalytically hydrotreated.

Claim 4

The process of claim 1 wherein all of said residual pitch is recycled to extinction.

Claim 5

The process of claim 1 wherein at least a part of said heavy hydrocarbonaceous oil is catalytically hydrotreated prior to being thermally cracked.

Claim 6

The process of claim 4 wherein said residual pitch, said recycle donor solvent and said heavy hydrocarbonaceous oil are combined and catalytically hydrotreated prior to being thermally cracked.

Claim 7

The process of claim 4 wherein said at least a part of said heavy hydrocarbonaceous oil is first contacted with a hydrotreating catalyst capable of removing metals-containing components therefrom and then contacted with additional hydrotreating catalyst.

Claim 8

The process of claim 6 wherein all of said heavy hydrocarbonaceous oil is combined with all of said residual pitch and recycle donor solvent prior to being catalytically hydrotreated.

Claim 9

A process for converting heavy hydrocarbonaceous oil into lighter distillate products comprising: (a) thermally cracking said oil in the presence of a hydrogen donor solvent at cracking conditions including a furnace outlet temperature of 850°-1000° F., a furnace outlet pressure of 400-700 psig and a cold oil residence time of one to six minutes to produce distillate products and residual pitch; (b) recovering recycle donor solvent from said distillate products; (c) catalytically hydrotreating said recycle donor solvent and at least a part of said residual pitch at a temperature of from 650°-800° F., a pressure of from 500 to 3000 psig, a liquid hourly space velocity of 0.1 to 5.0 per hour and a hydrogen circulation rate of 500 to 8000 SCF H 2 /Bbl of charge; (d) combining hydrotreated recycle donor solvent and hydrotreated residual pitch with additional heavy hydrocarbonaceous oil; and (e) subjecting said combined materials to thermal cracking as in step (a).

Claim 10

A process for converting heavy hydrocarbonaceous oil into lighter distillate products comprising: (a) thermally cracking said oil in the presence of a hydrogen donor solvent at cracking conditions including a furnace outlet temperature of 850°-1000° F., a furnace outlet pressure of 400-700 psig and a cold oil residence time of one to six minutes to produce distillate products and residual pitch; (b) recovering recycle donor solvent from said distillate products; (c) catalytically hydrotreating said recycle donor solvent and at least a part of said residual pitch at a temperature of from 650°-800° F., a pressure of from 500 to 3000 psig, a liquid hourly space velocity of 0.1 to 5.0 per hour and a hydrogen circulation rate of 500 to 8000 SCF H 2 /Bbl of charge; (d) combining hydrotreated recycle donor solvent and hydrotreated residual pitch with additional heavy hydrocarbonaceous oil; and (e) subjecting said combined materials to thermal cracking as in step (a).