Process and apparatus for hydrocracking and hydroisomerizing a hydrocarbon stream
AssigneeUop LLC
InventorsSailesh B. Kumar, Andrew J. Towarnicky, Vasant P. Thakkar, Massimo Sangalli, John A. Petri
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Abstract
A process and apparatus for quenching a hydrocracked stream to prepare it for hydroisomerization. A fractionated hydroisomerized stream is recycled to quench a hot hydrocracked stream prior to hydroisomerization. Sufficient quenching can inactivate the hydroisomerization catalyst bed. The hydroisomerization catalyst bed can be heated back to hydroisomerization temperature and can actively hydroisomerize again.
Claims16
A process for hydrocracking and hydroisomerizing a hydrocarbon stream comprising:
- hydrotreating a hydrocarbon feed stream to provide a hydrotreated hydrocarbon feed stream;
- hydrocracking the hydrotreated hydrocarbon feed stream over a first hydrocracking catalyst bed to provide a hydrocracked stream;
- hydroisomerizing said hydrocracked stream over a first hydroisomerization catalyst bed to provide a hydroisomerized stream, wherein said hydroisomerizing is conducted at a lower temperature than said hydrocracking;
- fractionating said hydroisomerized stream in a fractionation section to provide a first fractionated stream;
- and
- recycling said first fractionated stream to said first hydroisomerization catalyst bed to quench said hydrocracked stream and provide a combined stream comprising said hydrocracked stream and said first fractionated stream;
- wherein said hydrocracked stream is fed to said first hydroisomerization catalyst bed bypassing said fractionation section.
A process for hydrocracking and hydroisomerizing a hydrocarbon stream comprising:
- hydrotreating a hydrocarbon feed stream to provide a hydrotreated hydrocarbon feed stream;
- hydrocracking the hydrotreated hydrocarbon feed stream over a first hydrocracking catalyst bed in a first reactor to provide a hydrocracked stream;
- hydroisomerizing said hydrocracked stream over a first hydroisomerization catalyst bed in said first reactor to provide a hydroisomerized stream, wherein said hydroisomerizing is conducted at a lower temperature than said hydrocracking;
- fractionating a first effluent stream from said first reactor to provide a first fractionated stream and a second fractionated stream;
- recycling said first fractionated stream to said first hydroisomerization catalyst bed in said first reactor to quench said hydrocracked stream;
- and
- hydrocracking said second fractionated stream over a second hydrocracking catalyst bed in a second reactor to provide a second hydrocracked stream.
Dependencies are inferred from the claim text.