Method and system for preparing propylene
A technology for propylene and olefins, which is applied in the multi-stage series-connected refining and cracking process, hydrocarbon cracking to produce hydrocarbons, and hydrocarbon oil processing. % and other problems to achieve the effect of improving economic efficiency, realizing efficient utilization and low product cost
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[0124] The preparation method of catalytic cracking catalyst A used in the embodiment is briefly described as follows:
[0125] 1), 20 grams of NH 4 Cl is dissolved in 1000 grams of water, and 100 grams (dry basis) of crystallized product ZRP-1 zeolite (produced by Qilu Petrochemical Company Catalyst Factory, SiO 2 / Al 2 o 3 =30, rare earth content RE 2 o 3 =2.0% by weight), after exchanging at 90°C for 0.5 hours, filtered to obtain a filter cake; Add 4.0 grams of H 3 PO 4 (concentration 85%) and 4.5 grams of Fe(NO 3 ) 3 Dissolved in 90 grams of water, mixed with filter cake, impregnated and dried; then roasted at 550°C for 2 hours to obtain phosphorus and iron-containing MFI structure mesoporous zeolite, its elemental analysis chemical composition is:
[0126] 0.1Na 2 O·5.1Al 2 o 3 2.4P 2 o 5 1.5Fe 2 o 3 3.8RE 2 o3 88.1 SiO2 2 .
[0127] 2), with 250 kilograms of decationized water, 75.4 kilograms of polyhydrate kaolin (industrial product of Suzhou China Cla...
Embodiment 1
[0132] This example follows figure 1 The process of the test is carried out. The raw material oil A is used as the raw material oil for catalytic cracking. The test is carried out on the medium-sized device of the variable-diameter fluidized bed reactor. Catalytic cracking reaction occurs in the reaction zone I and the second reaction zone II, the reaction product and the spent catalyst to be charred are separated in the settler, and the reaction product is cut according to the distillation range in the product fractionation device, so as to obtain dry gas, liquefied gas, propylene, C 6 Distillate sections, gasoline, diesel and oil slurry. C 6 The distillate section separates the C that accounts for 10% by weight of feed oil 6 Olefins are recycled to the second reaction zone of the medium-sized unit of the variable-diameter fluidized bed reactor to continue cracking. The operating conditions and product distribution are listed in Table 3.
Embodiment 2
[0136] Raw oil B is used as the raw material for catalytic cracking, in such as figure 2 Experiments were carried out on the riser reactor + fluidized bed reactor shown. Feedstock oil B is contacted with catalyst B, and the reaction is carried out in a riser reactor under the conditions that the reaction temperature is 650°C, the reaction time is 0.8 seconds, the weight ratio of agent to oil is 20, and the weight ratio of water to oil is 0.8; The agent is introduced into the fluidized bed reactor to continue the reaction, the reaction temperature is 580°C, and the weight hourly space velocity is 10h -1 . Obtain the raw catalyst and the reaction product, regenerate the raw catalyst, and return the regenerated catalyst as the catalytic cracking catalyst to the riser reactor; the reaction product is cut according to the distillation range in the product fractionation device, thereby obtaining dry gas, Liquefied petroleum gas, propylene, C 6 Distillate sections, gasoline, dies...
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