Method for producing propylene by catalytic cracking of naphtha
A catalytic cracking and naphtha technology, applied in chemical instruments and methods, molecular sieve catalysts, bulk chemical production, etc., can solve the problem of low propylene yield and achieve high propylene yield
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Embodiment approach
[0019] According to a preferred embodiment of the present invention, described catalytic cracking is carried out as follows:
[0020] In the presence of the first catalyst and water, the naphtha is subjected to the first catalytic cracking to obtain the first cracking product oil;
[0021] In the presence of the second catalyst and water, the first cracked product oil is subjected to the second catalytic cracking to obtain the cracked reaction product.
[0022] In the foregoing preferred embodiment, the first catalyst and the second catalyst are used as the catalyst bed for the catalytic cracking of naphtha to produce propylene, and the first catalytic cracking reaction and the second catalytic cracking reaction are carried out on the first catalyst and the second catalyst respectively . The first catalyst is a granular catalyst and the second catalyst is a structured catalyst, which can better realize the catalytic cracking of naphtha to produce propylene and increase the yi...
Embodiment 1
[0067] This example is used to illustrate the method for producing propylene by catalytic cracking of naphtha of the present invention.
[0068] (1) Pretreatment. At 60°C and 0.1 MPa, naphtha (containing 1% by weight of olefins, 56% by weight of alkanes, 32% by weight of naphthenes, 11% by weight of aromatics, and 50 μg / g of basic nitrogen) was measured at a weight hourly space velocity 1h -1 Contact with NKC-9 dry hydrogen catalytic resin, the basic nitrogen content in the obtained treated oil is 0.5μg / g.
[0069] (2) Propylene production. After the treated oil and water obtained in (1) are preheated at 250°C, they are injected into the fixed-bed reactor equipped with the first catalyst particles for the first catalytic cracking, and then injected into the structured reactor equipped with the second catalyst for the second Two catalytic cracking.
[0070] Wherein, the first catalyst contains 95% by weight of La-modified ZRP-1 zeolite (silicon-aluminum atomic molar ratio i...
Embodiment 2
[0077] This example is used to illustrate the method for producing propylene by catalytic cracking of naphtha of the present invention.
[0078] (1) Pretreatment. At 30°C and 0.2 MPa, naphtha (containing 1% by weight of olefins, 56% by weight of alkanes, 32% by weight of naphthenes, 11% by weight of aromatics, and 50 μg / g of basic nitrogen) was measured at a weight hourly space velocity 5h -1 Contact with LSI-600 ion exchange resin, the basic nitrogen content in the obtained treated oil is 0.4μg / g.
[0079] (2) Propylene production. After the treated oil and water obtained in (1) are preheated at 250°C, they are injected into the fixed-bed reactor equipped with the first catalyst particles for the first catalytic cracking, and then injected into the structured reactor equipped with the second catalyst for the second Two catalytic cracking.
[0080] Wherein, the first catalyst contains 90% by weight of Fe-modified ZSM-5 zeolite (silicon-aluminum atomic molar ratio is 75), 1...
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Abstract
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