Thermal cracking of gas oil to middle distillate

Claim 2

A process for the thermal cracking of a hydrocarbonaceous oil feed, which comprises: (a) treating a hydrocarbonaceous oil consisting essentially of gas oil in a thermal cracking zone at thermal cracking conditions in the absence of a catalyst, in the absence of added oxygen, and in the presence of an added olefin-containing naphtha, said naphtha containing at least about 10 volume % olefins and less than about 30 volume % aromatics, and (b) recovering the thermally cracked products.

Claim 3

The process of claim 1 wherein said thermal cracking conditions include a temperature ranging from about 700° to about 1100° F.

Claim 4

The process of claim 1 wherein said thermal cracking conditions include a temperature ranging from about 800° to about 950° F.

Claim 5

The process of claim 1 wherein said thermal cracking conditions include a pressure ranging from about 50 to 1500 psig.

Claim 6

The process of claim 1 wherein said thermal cracking conditions include a pressure ranging from about 200 to about 1200 psig.

Claim 7

The process of claim 1 wherein said olefin-containing naphtha is separated from said thermally cracked product and wherein at least a portion of the separated olefin-containing naphtha is recycled to said thermal cracking zone.

Claim 8

The process of claim 1 wherein said olefin-containing naphtha is produced by a thermal cracking process.

Claim 9

The process of claim 1 wherein said feed of step (a) is obtained by treating a heavy hydrocarbonaceous oil in a thermal cracking zone at thermal cracking conditions to produce a thermally cracked product, separating a gas oil fraction from said thermally cracked product and subjecting at least a portion of the separated gas oil to said thermal cracking zone of step (a).

Claim 10

The process of claim 8 wherein the thermal cracking conditions of said heavy hydrocarbonaceous oil treating zone include a temperature ranging from about 700° to about 1100° F. and wherein said thermal cracking conditions of said gas oil treating zone include a temperature ranging from about 700° to about 1100° F.

Claim 11

The process of claim 9 wherein said olefin-containing naphtha is also added to said thermal cracking zone of said heavy hydrocarbonaceous oil.

Claim 12

The process of claim 1 wherein the volumetric ratio of said added naphtha to said gas oil ranges from about 0.1:1 to 0.5:1.

Claim 13

The process of claim 1 wherein said olefin-containing naphtha comprises less than 20 volume percent aromatics.

Claim 14

The process of claim 1 wherein said olefin-containing naphtha is essentially free of aromatics.

Claim 15

A process for the thermal cracking of a hydrocarbonaceous feedstock which comprises: contacting a hydrocarbonaceous feedstock consisting essentially of a gas oil at mild thermal cracking conditions including a temperature ranging from about 800° to 950° F., a pressure ranging from about 200 to about 1200 psig in the absence of a catalyst, in the absence of added oxygen, and in the presence of an added olefin-containing naphtha, said naphtha containing at least about 10 volume % olefins and less than about 30 volume % aromatics.

Claim 16

A process for the thermal cracking of a hydrocarbonaceous feedstock which comprises: contacting a hydrocarbonaceous feedstock consisting essentially of a gas oil at mild thermal cracking conditions including a temperature ranging from about 800° to 950° F., a pressure ranging from about 200 to about 1200 psig in the absence of a catalyst, in the absence of added oxygen, and in the presence of an added olefin-containing naphtha, said naphtha containing at least about 10 volume % olefins and less than about 30 volume % aromatics.

Claim 17

A two-stage process for the thermal cracking of a hydrocarbonaceous feedstock which comprises: (a) treating a heavy hydrocarbonaceous oil comprising residual components in a first thermal cracking zone at thermal cracking conditions including a temperature ranging from about 700° to 1100° F. and a pressure ranging from about 50 to about 1500 psig to produce a first thermally cracked product; (b) separating from said first thermally cracked product a gas oil fraction; (c) passing at least a portion of said separated gas oil fraction to a second thermal cracking zone; (d) treating said portion of said separated gas oil in said second thermal cracking zone at thermal cracking conditions including a temperature ranging from about 700° to 1100° F. and a pressure ranging from about 50 to about 1500 psig in the presence of an added olefin-containing naphtha, said naphtha containing at least about 10 volume % olefins and less than about 30 volume % aromatics.

Claim 18

A two-stage process for the thermal cracking of a hydrocarbonaceous feedstock which comprises: (a) treating a heavy hydrocarbonaceous oil comprising residual components in a first thermal cracking zone at thermal cracking conditions including a temperature ranging from about 700° to 1100° F. and a pressure ranging from about 50 to about 1500 psig to produce a first thermally cracked product; (b) separating from said first thermally cracked product a gas oil fraction; (c) passing at least a portion of said separated gas oil fraction to a second thermal cracking zone; (d) treating said portion of said separated gas oil in said second thermal cracking zone at thermal cracking conditions including a temperature ranging from about 700° to 1100° F. and a pressure ranging from about 50 to about 1500 psig in the presence of an added olefin-containing naphtha, said naphtha containing at least about 10 volume % olefins and less than about 30 volume % aromatics.

Claim 19

The process of claim 15 wherein said first thermal cracking zone in operated at a temperature ranging from about 750° to about 950° F. and wherein said second thermal cracking zone is operated at a temperature ranging from about 800° to about 950° F.

Claim 20

The process of claim 15 wherein said first thermal cracking zone also comprises an added olefin-containing naphtha.