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Method for producing propylene ethane by catalytic cracking carbon-containing olefin

A catalytic cracking, propylene and ethylene technology, applied in the fields of hydrocarbon cracking, organic chemistry, etc., can solve the problems of low added value of carbon-containing olefin mixture, and the independence and combination of carbon-containing olefin cracking process.

Active Publication Date: 2009-07-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the added value of the carbon-containing olefin mixture is not high in the prior art and the independence and combinability of the carbon-containing olefin cracking process are not strong. Vinyl method

Method used

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  • Method for producing propylene ethane by catalytic cracking carbon-containing olefin
  • Method for producing propylene ethane by catalytic cracking carbon-containing olefin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] according to figure 1As shown, the composition (% by weight) of the carbon-containing olefin mixture is: isobutene: 45%, isobutane: 55%. Adopting the technical process of the present invention, the catalyst is a ZSM-5 molecular sieve with a silicon-aluminum ratio of 200, the reactor is a fixed-bed reactor, and the reaction weight hourly space velocity is 15 hours -1 , the reaction temperature is 450°C, the reaction pressure is 0.08MPa, the temperature after partial condenser 5 is 25°C, the cracked product is compressed to 1.5MPa, 28% by weight of C 4 The above cut cycle is used as the cracking raw material, and the pilot plant proves that the product (% by weight) of the following ratio will be obtained:

[0035] Ethylene at a concentration of 90% by weight: 15.3%

[0036] Propylene at 92% by weight: 46.0%

[0037] Non-condensable gas: 0.06%

[0038] 95% propane by weight: 2.2%

[0039] C 4 ~C 5 Fraction:: 31.2%

[0040] Pyrolysis gasoline: 5.2%

Embodiment 2

[0042] according to figure 1 As shown, the composition of the carbon-containing olefin mixture is the same as in Example 1, and the process flow of the present invention is adopted. The catalyst is a ZSM-5 molecular sieve with a silicon-aluminum ratio of 200, and the reactor is a fixed-bed reactor, and the reaction weight hourly space velocity is 50 hours -1 , the reaction temperature is 500 ° C, the reaction pressure is 0.18 MPa, the temperature after the partial condenser 5 is 35 ° C, the cracked product is compressed to 2.5 MPa, 50% by weight of C 4 The above cut cycle is used as the cracking raw material, and the pilot plant proves that the product (% by weight) of the following ratio will be obtained:

[0043] Ethylene at a concentration of 95% by weight: 23.3%

[0044] Propylene at 96% by weight: 38.3%

[0045] Non-condensable gas: 0.06%

[0046] 92% propane by weight: 3.0%

[0047] C 4 ~C 5 Fraction:: 30.5%

[0048] Pyrolysis gasoline: 4.8%

Embodiment 3

[0050] according to figure 1 As shown, the composition of the carbon-containing olefin mixture is the same as in Example 1, and the technical process of the present invention is adopted, the catalyst is a ZSM-5 molecular sieve with a silicon-aluminum ratio of 200, and the reactor is a fixed-bed reactor, and the reaction weight hourly space velocity is 80 hours -1 , the reaction temperature is 550 ° C, the reaction pressure is 0.25 MPa, the temperature after the partial condenser 5 is 55 ° C, the cracked product is compressed to 3.5 MPa, 70% by weight of C 4 The above cut cycle is used as the cracking raw material, and the pilot plant proves that the product (% by weight) of the following ratio will be obtained:

[0051] Ethylene at a concentration of 98% by weight: 22.2%

[0052] Propylene at 99% by weight: 37.9%

[0053] Non-condensable gas: 0.06%

[0054] 83% propane by weight: 4.3%

[0055] C 4 ~C 5 Fraction:: 31.2%

[0056] Pyrolysis gasoline: 4.3%

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Abstract

The invention relates to a method for producing propylene and ethylene by catalytic cracking of carbon-containing olefins, which mainly solves the problem that although carbon-containing olefin mixtures in industrial devices are rich in olefins, they were mainly used as fuel gas in the past, and the added value was not high. In the present invention, by selecting a shape-selective molecular sieve catalyst, the carbon-containing olefin mixture is catalytically cracked under the condition of no shared materials, and the weight yield of propylene and ethylene in the obtained product is not less than 60% (relative to the total amount of olefins in fresh raw materials). The liquid-phase raw material carbon-containing olefin mixture is vaporized and preheated by heat exchange with the cracked product, and then heated by a heating furnace to reach the reaction temperature; the cracked product is partially condensed after heat exchange, and part of the fraction above C6 is separated; the remaining cracked products are compressed to 1.0-4.0MPa, sent to the subsequent separation unit for further separation, respectively to obtain propylene with a weight concentration of 90-99%, ethylene with a weight concentration of 90-99%, circulating propane, pyrolysis gasoline, and C4-C5 fractions; 20-80% (weight ratio) of the C4 ~ C5 cuts circulated into the reactor. This method better solves the problem of low added value of the carbon-containing olefin mixture, and can be used in industrial devices for producing propylene and ethylene.

Description

technical field [0001] The invention relates to a method for producing propylene and ethylene by catalytic cracking of carbon-containing olefins. Background technique [0002] Propylene and ethylene are important basic organic chemical raw materials. Propylene is mainly used to produce PP, cumene, acrylonitrile, acrylic acid and many other products; ethylene is used to produce polyethylene (PE), polyvinyl chloride (PVC) and ethylene oxide / ethylene glycol (EO / EG), etc. The main raw material of organic chemical products. As important light olefins, the annual demand for propylene and ethylene keeps growing. Thermal cracking of hydrocarbons is still one of the main methods for producing ethylene, while the process for producing propylene can generally be summarized as a by-product process and a proprietary process. The by-product process mainly refers to propylene obtained by steam cracking and catalytic cracking ethylene units. Proprietary technology refers to the technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/06C07C11/04C07C11/06
Inventor 甘永胜谢在库杨为民宗弘元吴文伟钱宏义
Owner CHINA PETROLEUM & CHEM CORP
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