Method for increasing selectivity and yield of ethylene and propylene
A selectivity and propylene technology, which is applied in the field of improving the selectivity and yield of ethylene and propylene, and can solve the problems of low yield and low selectivity
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Embodiment 1
[0017] Using methanol as raw material, the first reaction zone and the second reaction zone both use riser reactors, with SAPO-34 molecular sieve as the catalyst, the reaction temperature in the first reaction zone is 450°C, the contact time is 2 seconds, and the reaction pressure is 0.05MPa; The reaction temperature in the second reaction zone is 480°C, the contact time is 3 seconds, and the reaction pressure is 0.02MPa; the reaction temperature in the third zone reaction zone is 450°C, the contact time is 3 seconds, and the reaction pressure is 0.03MPa. In the experiment, after the reaction gas mixture in the first reaction zone is separated from the solid catalyst, the gas phase directly enters the second reaction zone for reaction, and the reaction product from the second reaction zone is separated and C4 and above hydrocarbons enter the third reaction zone. The gas-solid mixture in the three reaction zones directly enters the first reaction zone, and the reaction results a...
Embodiment 2
[0019] Using dimethyl ether as raw material, the first reaction zone and the second reaction zone both use riser reactors, with SAPO-34 molecular sieve as the catalyst, the reaction temperature in the first reaction zone is 400 ° C, the contact time is 1 second, and the reaction pressure is 0.4 MPa; the reaction temperature in the second reaction zone is 500°C, the contact time is 5 seconds, and the reaction pressure is 0.3MPa; the reaction temperature in the third zone reaction zone is 400°C, the contact time is 1 second, and the reaction pressure is 0.04MPa. In the experiment, after the reaction gas mixture in the first reaction zone is separated from the solid catalyst, the gas phase directly enters the second reaction zone for reaction, and the reaction product from the second reaction zone is separated and C4 and above hydrocarbons enter the third reaction zone. The gas-solid mixture in the three reaction zones directly enters the first reaction zone, and the reaction resu...
Embodiment 3
[0021] Methanol and dimethyl ether are used as raw materials, the weight ratio of methanol and dimethyl ether is 1:1, the first reaction zone and the second reaction zone both adopt fast fluidized bed reactors, and SAPO-34 molecular sieve is used as the catalyst. The reaction temperature in the reaction zone is 500°C, the contact time is 3 seconds, and the reaction pressure is 1.2MPa; the reaction temperature in the second reaction zone is 550°C, the contact time is 6 seconds, and the reaction pressure is 1.0MPa; the reaction temperature in the third zone is 500°C, The contact time was 5 seconds, and the reaction pressure was 1.2 MPa. In the experiment, after the reaction gas mixture in the first reaction zone is separated from the solid catalyst, the gas phase directly enters the second reaction zone for reaction, and the reaction product from the second reaction zone is separated and C4 and above hydrocarbons enter the third reaction zone. The gas-solid mixture in the three ...
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