Combined hydrotreating process and configurations for same
View Patent ↗At least two feedstocks ( 210 A) ( 210 B) with different boiling point ranges are hydrotreated in an integrated hydrogenation plant ( 200 ) using an interbed separator ( 240 ) that is fluidly coupled between two hydrogenation reactors ( 230 A) ( 230 B). Contemplated configurations and methods will significantly reduce construction and operating cost by integration of at least two hydrogenation processes of two different feedstocks into one process, and/or by providing process conditions that reduce use of catalyst in at least one of the reactors.
1. A system for integrated hydrotreating of a first and a second feedstock with different boiling point ranges, comprising:
an interbed separator that is configured to produce a separator liquid and to receive a first hydrocarbonaceous feed and a second hydrocarbonaceous feed, wherein the first feed has a temperature that is effective to preheat and vaporize at least part of the second feed, thereby producing a preheated and at least partially vaporized second feed;
wherein the first hydrocarbonaceous feed has a higher boiling point range than the second hydrocarbonaceous feed;
a first hydrotreating reactor configured to provide the portion of the first feed, and a second hydrotreating reactor configured to receive at least a portion of the preheated and at least partially vaporized second feed and to produce a liquid product; and
wherein the plant is further configured such that the liquid product and the separator liquid are separately withdrawn from the system.
2. The system of claim 1 wherein the interbed separator comprises at least a partial vapor liquid equilibrium stage.
3. The system of claim 1 wherein the interbed separator comprises at least two vapor liquid equilibrium stages.
4. The system of claim 1 wherein the interbed separator is a trayed column or a packed column.
5. The system of claim 1 wherein the first feed comprises hydrotreated gas oil or cycle oil from a fluid catalytic cracking reactor.
6. The system of claim 1 wherein the second feed comprises diesel oil or cycle oil from a fluid catalytic cracking reactor.
7. The system of claim 1 wherein the interbed separator further receives a hydrogen containing stream.
8. The system of claim 7 wherein the hydrogen containing stream is recycled in the plant.
9. The system of claim 7 wherein at least a portion of the hydrogen containing stream is a make-up hydrogen stream.
10. The system of claim 1 wherein the interbed separator is operated at a pressure of between about 500 psi to about 2400 psi.
11. The system of claim 10 wherein the second hydrotreating reactor is operated at a pressure of between about 700 psi and about 2000 psi.
12. The system of claim 1 wherein at least a portion of the second feed is fed into the second hydrotreating reactor.
13. The system of claim 1 wherein a third feed is fed to the second hydrotreating reactor.
14. The system of claim 12 wherein the portion of the second feed has a temperature effective to regulate a temperature in the second hydrotreating reactor.
15. The system of claim 12 wherein the portion of the second feed controls recovery of a lighter boiling range material from the hydrotreated first feed in the interbed separator.
16. The system of claim 1 wherein the interbed separator and the second reactor are integrated as an upgrade into an existing hydroprocessing plant.
17. The system of claim 1 wherein the first hydrotreater receives a first total feed and the second hydrotreating reactor receives a second total feed, and wherein the second total feed is between 25 vol % to 90 vol % of the first total feed.
18. The system of claim 1 wherein the first hydrotreater receives a first total feed and the second hydrotreating reactor receives a second total feed, and wherein the second total feed is between 40 vol % to 80 vol % of the first total feed.
19. A method of hydrotreating at least two distinct hydrocarbonaceous feeds to form at least two distinct hydrotreated products, comprising:
providing a first hydrotreating reactor, a second hydrotreating reactor, and an interbed separator that receives a first hydrocarbonaceous feed and a second hydrocarbonaceous feed, wherein the first hydrocarbonaceous feed has a higher boiling point range than the second hydrocarbonaceous feed;
fluidly coupling the interbed separator to the first and second hydrotreating reactors;
using the first feed to preheat and vaporize at least part of the second feed, thereby producing a preheated and at least partially vaporized second feed;
and feeding at least a portion of the preheated and at least partially vaporized second feed into the second hydrotreating reactor; and
separately withdrawing a hydrotreated first hydrocarbonaceous fluid from the interbed separator and a hydrotreated second hydrocarbonaceous fluid from the second hydrotreating reactor.
20. The method of claim 19 wherein the first feed comprises a gas oil boiling range material and wherein the second feed comprises a material with a lower boiling range than gas oil.
21. The method of claim 19 wherein the interbed separator is operated at a pressure of between about 500 psi and about 2400 psi, and wherein the second hydrotreating reactor is operated at a pressure of between about 700 psi and about 2000 psi.
22. The method of claim 19 wherein the second hydrotreating reactor produces a product that sponges components from a recycle gas that is created at least in part in the first hydrotreating reactor.
23. A system for integrated hydrotreating of a first and a second feedstock with different boiling point ranges, comprising:
an interbed separator that receives a first hydrocarbonaceous feed and a second hydrocarbonaceous feed, and that forms a first hydrotreated liquid, wherein the first feed preheats and vaporizes at least part of the second feed, thereby producing a preheated and at least partially vaporized second feed;
wherein the at least a portion of the first feed is provided by a first hydroprocessing reactor, and wherein at least a portion of the preheated and at least partially vaporized second feed is fed into a second hydroprocessing reactor that produces a hydrotreated product;
wherein the first hydrocarbonaceous feed has a higher boiling point range than the second hydrocarbonaceous feed;
wherein at least a portion of the second feed is fed into the second hydroprocessing reactor; and
wherein the system is further configured to allow separate withdrawal of the first hydrotreated liquid and the hydrotreated product.
24. A system for integrated hydrotreating of a first and a second feedstock with different boiling point ranges comprising:
an interbed separator that receives a first hydrocarbonaceous feed and a second hydrocarbonaceous feed, wherein the first feed preheats and vaporizes at least part of the second feed, thereby producing a preheated and at least partially vaporized second feed;
wherein at least a portion of the first feed is provided by a first hydroprocessing reactor, and wherein at least a portion of the preheated and at least partially vaporized second feed is fed into a second hydroprocessing reactor that produces a product;
wherein the first hydrocarbonaceous feed has a higher boiling point range than the second hydrocarbonaceous feed; and
wherein a third feed is fed into the second hydroprocessing reactor.