Process of catalytically cracking C4 and above olefin to produce propylene
A catalytic cracking and olefin technology, applied in the direction of hydrocarbon cracking, hydrocarbon production, organic chemistry, etc., can solve the problems of low yield and low selectivity of the target product propylene, achieve improved shape selectivity, good technical effect, and suppress hydrogen transfer reaction Effect
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Embodiment 1~3
[0017] The reaction temperature has a significant impact on the reaction of olefin catalytic cracking to produce propylene. Generally speaking, the reaction temperature is beneficial to the formation of the reaction product propylene.
[0018] 5 grams of silicon-aluminum molar ratio (SiO 2 / Al 2 o 3 ) is 100 ZSM-5 molecular sieves, placed in 200 milliliters, 5% by weight NH 4 NO 3 In the solution, exchange at a temperature of 85-90°C for 2 hours, and repeat 3 times. After the exchange, the hydrogen-type ZSM-5 molecular sieve was obtained by washing and drying at 120°C. 4 grams of hydrogen-type ZSM-5 molecular sieves were mixed with 6.7 grams of 40% (weight) silica sol, and then extruded. After drying at 120°C and calcining at 400°C, the Z-0 catalyst was prepared. Before the reaction, the catalyst was activated at 500° C. for 2 hours under a nitrogen atmosphere. C used in the experiment 4 The feedstock comes from the catalytic cracking unit (FCC) in the refinery.
[00...
Embodiment 4~7
[0024] The space velocity also has a significant impact on the reaction of olefin catalytic cracking to produce propylene. Generally speaking, increasing the reaction space velocity is beneficial to the selectivity of the reaction product propylene, but it will reduce the conversion rate of olefin.
[0025] According to US3702886, the molar ratio of silicon to aluminum (SiO 2 / Al 2 o 3 ) is a ZSM-5 molecular sieve of 200, and then obtains the HZ-1 catalyst according to the same preparation method as in Examples 1-3.
[0026] C used in the experiment 4 The feedstock comes from the catalytic cracking unit (FCC) in the refinery. Change the liquid space velocity of raw material, reaction condition and reaction result are shown in table 2.
[0027]
[0028] Catalyst: HZ-1 Reaction temperature 540°C
Embodiment 8~11
[0030] The silicon-aluminum molar ratio (SiO 2 / Al 2 o 3 ) is the former powder of ZSM-5 molecular sieve of 300, and then obtain Z-0 catalyst according to the preparation method identical with embodiment 1~3. The above-mentioned 5 grams of silicon-aluminum molar ratio (SiO 2 / Al 2 o 3 ) is the former powder of ZSM-5 molecular sieve of 300, is placed in 200 milliliters, 5% weight NH 4 NO 3In the solution, exchange at a temperature of 85-90°C for 2 hours, and repeat 3 times. After the exchange, the hydrogen-type ZSM-5 molecular sieve was obtained by washing and drying at 120°C. Mix 4 grams of hydrogen-type ZSM-5 molecular sieve with 4 milliliters of an aqueous solution containing 0.17 grams of magnesium nitrate, dry overnight at room temperature, and add 6.7 grams of 40% (weight) silica sol as a binder after drying at 120° C. for extrusion molding. After drying at 120°C and calcining at 400°C, catalyst Z-1 was obtained. By changing the amount of magnesium salt added, ca...
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