Method for increasing yield of propylene
A technology of propylene and ethylene, which is applied in the field of olefin catalytic cracking technology to improve the yield of propylene, and can solve the problems of low selectivity and low yield of propylene
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Embodiment 1
[0015] Using methanol as raw material, the first reactor adopts a fluidized bed reactor with SAPO-34 molecular sieve as a catalyst, the second reactor adopts a fixed bed reactor with tungsten oxide as a catalyst, and the third reactor adopts a fixed bed reactor. Using ZSM-5 molecular sieve as the catalyst, the reaction temperature of the first reactor is 450°C, and the reaction space velocity is 6 hours -1 , the reaction pressure is 0.1MPa; the reaction temperature of the second reactor is 300°C, and the reaction space velocity is 1 hour -1 , the mass ratio of ethylene to butene is 1:1, and the reaction pressure is 3MPa. The reaction temperature of the third reactor is 480°C, and the reaction space velocity is 8 hours -1 , the pressure is 0.1MPa. In the experiment, after the reaction products in the first reactor were separated, all butene-1 and butene-2 entered the second reactor for reaction, and the remaining carbon four and above hydrocarbons entered the third reactor ...
Embodiment 2
[0017] Using dimethyl ether as raw material, the first reactor adopts a fluidized bed reactor with SAPO-34 molecular sieve as a catalyst, the second reactor adopts a fixed bed reactor with tungsten oxide as a catalyst, and the third reactor adopts a fixed bed reaction device, with ZSM-5 molecular sieve as the catalyst, the reaction temperature of the first reactor is 550°C, and the reaction space velocity is 40 hours -1 , the reaction pressure is 0.5MPa; the reaction temperature of the second reactor is 530°C, and the reaction space velocity is 10 hours -1 , the mass ratio of ethylene to butene is 1:1, and the reaction pressure is 0.01MPa. The reaction temperature of the third reactor is 570°C, and the reaction space velocity is 20 hours -1 , the reaction pressure is 0.01MPa. In the experiment, after the reaction products of the first reactor were separated, butene-1 and butene-2 all entered the second reactor for reaction, and the remaining carbon four and above hydrocarb...
Embodiment 3
[0019] Dimethyl ether is used as raw material, water is used as diluent, the mass ratio of dimethyl ether to water is 1:2, the first reactor adopts fluidized bed reactor, SAPO-34 molecular sieve is used as catalyst, and the second reactor adopts fixed The bed reactor uses tungsten oxide as the catalyst, the third reactor uses a fixed bed reactor, uses ZSM-5 molecular sieve as the catalyst, the reaction temperature of the first reactor is 630°C, and the space velocity is 25 hours -1 , the reaction pressure is 1.2MPa; the reaction temperature of the second reactor is 450°C, and the reaction space velocity is 5 hours -1 , the mass ratio of ethylene to butene is 1:1, and the reaction pressure is 0.2MPa. The reaction temperature of the third reactor is 600°C, and the reaction space velocity is 40 hours -1 , the reaction pressure is 1.5MPa. In the experiment, after the reaction products of the first reactor were separated, butene-1 and butene-2 all entered the second reactor for...
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