| CPC C07C 4/06 (2013.01) [C07C 7/04 (2013.01); C07C 2521/04 (2013.01); C07C 2523/04 (2013.01)] | 18 Claims |
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1. A fluidized catalytic conversion method comprising the steps of:
1) Introducing a heavy feedstock oil into a first reaction zone of a fluidized catalytic conversion reactor, contacting with a catalytic conversion catalyst having a temperature of 650° C. or higher, and reacting under first catalytic conversion reaction conditions;
2) Introducing a hydrocarbon oil feedstock having an olefin content of 50 wt % or more into a second reaction zone of the fluidized catalytic conversion reactor downstream of the first reaction zone, contacting with the catalytic conversion catalyst from the first reaction zone after the reaction of step 1), and reacting under second catalytic conversion conditions;
3) Separating the effluent of the fluidized catalytic conversion reactor to obtain reaction products and a spent catalyst, and carrying out a first separation on the reaction products to obtain ethylene, propylene, butylene, a first catalytic cracking distillate oil and a second catalytic cracking distillate oil, wherein the initial boiling point of the first catalytic cracking distillate oil is more than 20° C., the final boiling point of the second catalytic cracking distillate oil is less than 550° C., and the cut point between the first catalytic cracking distillate oil and the second catalytic cracking distillate oil is within a range of 140° C. and 250° C.;
4) Carrying out a second separation on the first catalytic cracking distillate oil to obtain an olefin-rich stream having a C5+ olefin content of at least 50 wt %;
5) Recycling at least a part of the olefin-rich stream to step 2) for further reaction; and
6) Recycling at least a part of the butylene separated in step 3) to the fluidized catalytic conversion reactor upstream of the position at which the heavy feedstock oil is introduced to contact with the catalytic conversion catalyst for reaction under third catalytic conversion conditions,
wherein the first catalytic conversion conditions include:
a reaction temperature of 500-800° C.;
a reaction pressure of 0.05-1 MPa;
a reaction time of 0.01-100 seconds;
a weight ratio of the catalytic conversion catalyst to the heavy feedstock oil of (1-200):1;
the second catalytic conversion conditions include:
a reaction temperature of 400-680° C.;
a reaction pressure of 0.05-1 MPa;
a reaction time of 0.01-100 seconds; and
a weight ratio of the catalytic conversion catalyst to the hydrocarbon oil feedstock of (1-100):1; and
the third catalytic conversion conditions include:
a reaction temperature of 650-800° C.;
a reaction pressure of 0.05-1 MPa;
a reaction time of 0.01 to 10 seconds; and
a weight ratio of the catalytic conversion catalyst to the butylene of (20-200):1.
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