Process and system for catalytic cracking of hydrocarbon oils
AssigneesChina Petroleum & Chemical Corporation, Research Institute of Petroleum Processing, Sinopec
InventorsJianhong Gong, Zhigang Zhang, Xiaoli Wei
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Abstract
A system for catalytic cracking of hydrocarbon oils has a catalytic cracking reactor, a catalyst separation device, an optional reaction product separator, and a regenerator. A catalytic cracking reactor has a dilute-phase transport fluidized bed and a fast fluidized bed connected in series for reaction. In the fast fluidized bed, the axial solid fraction ε of the catalyst is controlled within the range of about 0.1 to about 0.2. When used for catalytic cracking of hydrocarbon oil feedstocks, particularly heavy feedstock oils, the process and system show lower yields of dry gas and coke, and good product distribution.
Claims11
A system catalytic cracking of hydrocarbon oils, comprising a catalytic cracking reactor, a catalyst separation device, an optional reaction product separator, and a regenerator,
- wherein the catalytic cracking reactor comprises a dilute-phase transport fluidized bed and a fast fluidized bed connected in series, with the dilute-phase transport fluidized bed being in fluid communication with the fast fluidized bed and disposed at an upstream of the fast fluidized bed, along the flow direction of a reaction stream,
- the dilute-phase transport fluidized bed is provided with a catalyst inlet at a bottom and a first feedstock inlet at a lower part, the fast fluidized bed is provided with an outlet at a top and an optional second feedstock inlet at the bottom, the catalyst separation device is provided with an inlet, a catalyst outlet and a reaction product outlet, the optional reaction product separator is provided with a reaction product inlet, a dry gas outlet, a liquefied petroleum gas outlet, a gasoline outlet, a diesel oil outlet and a slurry outlet, and the regenerator is provided with a catalyst inlet and a catalyst outlet,
- the catalyst inlet of the dilute-phase transport fluidized bed is in fluid communication with the catalyst outlet of the regenerator, the outlet of the fast fluidized bed is in fluid communication with the inlet of the catalyst separation device, the reaction product outlet of the catalyst separation device is in fluid communication with the reaction product inlet of the optional reaction product separator, and the catalyst outlet of the catalyst separation device is in fluid communication with the catalyst inlet of the regenerator,
- wherein the fast fluidized bed comprises a full dense-phase reaction zone, a cross-sectional diameter of the bottom end of the full dense-phase reaction zone is greater than or equal to the diameter of the dilute-phase transport fluidized bed, the bottom or a side wall of the full dense-phase reaction zone is provided with one or more inlets for supplementary catalyst, each independently disposed at about 0-90% of the total height of the fast fluidized bed,
- wherein the full dense-phase reaction zone is in the form of an inverted truncated cone with a longitudinal section of an isosceles trapezoid, and the transition section of the full dense-phase reaction zone is in the form of a hollow truncated cone with a longitudinal section of an isosceles trapezium with sides having an internal inclination angle α of about 25-85°, and the axial solid fraction & of the catalyst in the fast fluidized bed is within the range of 0.1-0.2 from bottom to top,
- and
- the fast fluidized bed is further provided with an umbrella-shaped catalyst distribution plate at the bottom.
Dependencies are inferred from the claim text.