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US 2019/0161686 A1Published application
Process and apparatus for cracking hydrocarbons to lighter hydrocarbons
AssigneeUop LLC
InventorsJames M. Bell, Dharmesh C. Panchal
Life of this patent
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Abstract
A process and apparatus for catalytically cracking fresh heavy hydrocarbon feed to produce cracked products is disclosed. A fraction of the cracked products can be obtained to re-crack it in a downer reactor. The downer reactor may produce high selectivity to light olefins. Spent catalyst from both reactors can be regenerated in the same regenerator.
Claims20
A process for catalytically cracking hydrocarbons comprising:
- contacting a fresh hydrocarbon feed stream with an upwardly rising catalyst stream to produce a cracked hydrocarbon stream and a first spent catalyst stream;
- separating said first spent catalyst stream from said cracked hydrocarbon stream;
- and
- contacting a second hydrocarbon feed stream with a downwardly falling catalyst stream to produce a light hydrocarbon stream and a second spent catalyst stream.
1 more element
An apparatus for catalytically cracking hydrocarbons comprising:
- a riser comprising a first feed distributor for distributing fresh hydrocarbon feed stream to a riser;
- a first regenerated catalyst conduit connected with said riser reactor for delivering a first regenerated catalyst stream to said riser for contact with said fresh hydrocarbon feed stream;
- a disengager connected to an upper end of said riser for disengaging cracked products from spent catalyst;
- a reactor chamber below said disengager;
- a second regenerated catalyst conduit connected with said reactor chamber for delivering a second regenerated catalyst stream to said chamber;
- and
- a second feed distributor for distributing a second hydrocarbon feed stream to said reactor chamber for contact with said second regenerated catalyst stream.
4 more elements
A process for catalytically cracking hydrocarbons comprising:
- feeding a fresh hydrocarbon feed stream to a riser reactor;
- contacting said fresh hydrocarbon feed stream with an upwardly rising catalyst stream in said riser reactor to produce a cracked hydrocarbon stream and a first spent catalyst stream;
- separating said spent catalyst stream from said cracked hydrocarbon stream;
- feeding a second hydrocarbon feed stream to a reactor chamber;
- contacting said second hydrocarbon feed stream with a downwardly falling catalyst stream to produce a light hydrocarbon stream and a second spent catalyst stream;
- and
- collecting said cracked hydrocarbon stream and said light hydrocarbon stream in a plenum above said reactor chamber.
4 more elements
Dependencies are inferred from the claim text.