A kind of method of naphtha catalytic cracking to produce propylene
A catalytic cracking and naphtha technology, applied in the production of bulk chemicals, organic chemistry, hydrocarbon cracking and hydrocarbon production, etc., can solve the problem of low propylene yield
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Embodiment 1
[0061] This example is used to illustrate the method for producing propylene by catalytic cracking of naphtha of the present invention.
[0062] according to figure 1 The scheme shown implements the method of the present invention.
[0063] (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 57 μg / g of basic nitrogen) was measured by weight space-time Speed 1h -1 Contact with NKC-3 ion exchange resin, the basic nitrogen content in the obtained treated oil is 0.5μg / g.
[0064] (2) Propylene production. The treated oil and water obtained in (1) are preheated at 250°C, injected into the reactor equipped with the first catalyst as the catalyst bed, and then injected into the reactor equipped with the second catalyst as the catalyst bed.
[0065] Wherein, the first catalyst contains La-modified ZSM-5 molecular sieve (ZRP-1 molecular sieve, Si / Al=50:1) with a...
Embodiment 2
[0071] This example is used to illustrate the method for producing propylene by catalytic cracking of naphtha of the present invention.
[0072] (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 cycloalkanes, 11% by weight of aromatics, and a basic nitrogen content of 10 μg / g) was measured by weight space-time Speed 5h -1 Contact with LSI-600 ion exchange resin, the basic nitrogen content in the obtained treated oil is 0.4μg / g.
[0073] (2) Propylene production. The treated oil and water obtained in (1) are preheated at 250°C, injected into the reactor equipped with the first catalyst as the catalyst bed, and then injected into the reactor equipped with the second catalyst as the catalyst bed.
[0074] Wherein, the first catalyst contains Fe-modified ZSM-5 molecular sieve (Si / Al=75:1) with a content of 90% by weight, and alumina with a content of 10% by weight, wherein the content of Fe is 5% by ...
Embodiment 3
[0080] This example is used to illustrate the method for producing propylene by catalytic cracking of naphtha of the present invention.
[0081] (1) Pretreatment. At 50°C and 0.1 MPa, naphtha (containing 1% by weight of olefins, 56% by weight of alkanes, 32% by weight of cycloalkanes, 11% by weight of aromatics, and a basic nitrogen content of 30 μg / g) was measured by weight space-time Speed 3h -1 Contact with CT-175 ion exchange resin, the basic nitrogen content in the obtained treated oil is 0.6μg / g.
[0082] (2) Propylene production. The treated oil and water obtained in (1) are preheated at 250°C, injected into the reactor equipped with the first catalyst as the catalyst bed, and then injected into the reactor equipped with the second catalyst as the catalyst bed.
[0083] Wherein, the first catalyst contains P-modified ZSM-5 molecular sieve (Si / Al=100:1) with a content of 85% by weight, and alumina with a content of 15% by weight, wherein the content of P is 2% by we...
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