Process for fluid catalytic cracking and hydrocracking hydrocarbons

Patent metadata

Field	Value
Publication number	US-9422487-B2
Application number	US-201414248904-A
Country	US
Kind code	B2
Filing date	Apr 9, 2014
Priority date	Apr 9, 2014
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A process and apparatus for recovering cycle oil from FCC CSO is described. By feeding the additional cycle oil to a hydrocracking unit additional diesel, naphtha and petrochemical feedstock may be obtained. The additional cycle oil is obtained by vacuum separation of the CSO. The described process and apparatus can provide additional recovery for a refiner.

First claim

The invention claimed is:

1. A process for catalytically cracking hydrocarbons comprising:
feeding a hydrocarbon feed stream to an FCC reactor and contacting said hydrocarbon feed stream with catalyst to catalytically crack said hydrocarbon feed stream to provide a cracked stream;
disengaging said catalyst from said cracked stream;
fractionating said cracked stream into products including a slurry oil stream from a bottom of a main fractionation column;
separating said slurry oil stream in a separator into a cycle oil stream and a heavy stream under vacuum pressure, comprising condensing a separator overhead stream from an overhead of said separator, separating said condensed overhead stream in a receiver and taking said cycle oil stream from a bottom of said receiver; and
hydrocracking at least a portion of said cycle oil stream over hydrocracking catalyst to provide an upgraded stream.

2. The process of claim 1 further comprising heating said slurry oil stream before the separation step.

3. The process of claim 1 further comprising recycling a portion of said heavy stream to said separation step.

4. The process of claim 3 further comprising recycling a portion of said heavy stream from a separator bottoms line to a recycle inlet that is above an inlet of said slurry oil stream to said separator.

5. The process of claim 4 further comprising pulling a vacuum on a receiver overhead stream from said receiver and feeding it to a drain drum.

6. The process of claim 5 further comprising refluxing a portion of said cycle oil stream to said separator to a reflux inlet that is above said recycle inlet.

7. The process of claim 1 wherein said hydrocracking step is conducted in a hydrocracking reactor in which hydrocracking is the predominant reaction.

8. The process of claim 7 further comprising increasing a yield of diesel compared to a yield without hydrocracking said cycle oil stream.

9. A process for catalytically cracking hydrocarbons comprising:
feeding a hydrocarbon feed stream to an FCC reactor and contacting said hydrocarbon feed stream with catalyst to catalytically crack said hydrocarbon feed stream to provide a cracked stream;
disengaging said catalyst from said cracked stream;
fractionating said cracked stream into products including a slurry oil stream from a bottom of a main fractionation column;
heating said slurry oil stream;
separating said slurry oil stream into a separator overhead stream and a heavy stream under vacuum pressure in a separator vessel;
condensing said separator overhead stream;
separating said condensed overhead stream in a receiver;
taking said cycle oil stream from a bottom of said receiver; and
hydrocracking at least a portion of said cycle oil stream over hydrocracking catalyst to provide an upgraded product stream.

10. The process of claim 9 further comprising recycling said heavy stream to said separation step.

11. The process of claim 10 further comprising recycling a portion of said heavy stream from a bottom of said separator vessel to a recycle inlet that is above an inlet of said slurry oil stream to said separator vessel.

12. The process of claim 9 further comprising pulling a vacuum on a receiver overhead stream from said receiver and feeding it to a drain drum.

13. The process of claim 11 further comprising refluxing a portion of said cycle oil stream to said separator vessel to a reflux inlet that is above said recycle inlet.

14. The process of claim 9 wherein said hydrocracking step is conducted in a hydrocracking reactor in which hydrocracking is the predominant reaction.

15. The process of claim 9 further comprising increasing a yield of diesel compared to a yield without hydrocracking said cycle oil stream.

16. A process for catalytically cracking hydrocarbons comprising:
feeding a hydrocarbon feed stream to an FCC reactor and contacting said hydrocarbon feed stream with catalyst to catalytically crack said hydrocarbon feed stream to provide a cracked stream;
disengaging said catalyst from said cracked stream;
fractionating said cracked stream into products including a slurry oil stream from a bottom of a main fractionation column;
separating said slurry oil stream into a cycle oil stream and a heavy stream under vacuum pressure in a separator vessel, comprising condensing a separator overhead stream from said separator vessel; separating said condensed overhead stream in a receiver; and taking said cycle oil stream from a bottom of said receiver;
recycling said heavy stream to said separation step; and
hydrocracking at least a portion of said cycle oil stream over hydrocracking catalyst to provide an upgraded product stream.

17. The process of claim 16 further comprising pulling a vacuum on a receiver overhead stream from said receiver.

Assignees

• Uop Llc

Inventors

• Qafisheh Jibreel A
• Bonucci Jill A
• Zhu Xin X
• Cabanaw Boyd E

Classifications

• C10G2400/04

  Diesel oil · CPC title

• C10G11/18

  according to the "fluidised-bed" technique · CPC title

• C10G69/04 Primary

  including at least one step of catalytic cracking in the absence of hydrogen · CPC title