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Method for preparing olefin in lightweight by catalytic cracking olefin of containing carbon

A technology for catalytic cracking and light olefins, which is applied in the field of catalytic cracking of carbon-containing olefins to produce light olefins. No high-level problems, achieve good combinability, save energy consumption, and improve the conversion rate of olefins

Active Publication Date: 2007-12-26
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 in the prior art, the added value of carbon-containing olefin mixture is not high, the conversion rate of olefin catalytic cracking is not high, and the olefin catalytic cracking process can not be combined. A new carbon-containing olefin catalytic cracking method is provided. Process for producing light olefins

Method used

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  • Method for preparing olefin in lightweight by catalytic cracking olefin of containing carbon

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Embodiment 1

[0032] As shown in Figure 1, the carbon-containing olefin mixture composition (weight %) is: isobutene: 45%, isobutane: 55%. Adopt technological process of the present invention, catalyst is silicon aluminum ratio (SiO 2 / Al 2 o 3 ) 200 ZSM-5 molecular sieve, the reaction weight hourly space velocity is 15 hours -1 , the reaction temperature is 450 ° C, the reaction pressure is 0.08 MPa, the temperature after the partial condenser 5 is 25 ° C, the cracked product is compressed to 0.5 MPa, 48% by weight of C 4 Distillate recycle, the pilot plant proves that the following proportions of products (% by weight) will be obtained:

[0033] Ethylene: 20.2%

[0034] Propylene: 43.3%

[0035] Other C 3 Below: 3.2%

[0036] C 4 Above fraction: 33.3%

Embodiment 2

[0038] As shown in Figure 1, the composition of the carbon-containing olefin mixture is the same as in Example 1. Adopt technological process of the present invention, catalyst is silicon aluminum ratio (SiO 2 / Al 2 o 3 ) 200 ZSM-5 molecular sieve, the reaction weight hourly space velocity is 60 hours -1 , the reaction temperature is 500 ° C, the reaction pressure is 0.15 MPa, the temperature after the partial condenser 5 is 45 ° C, the cracked product is compressed to 0.85 MPa, 68% by weight of C 4 Distillate recycle, will obtain the product (weight %) of following ratio:

[0039] Ethylene: 21.6%

[0040] Propylene: 44.3%

[0041] Other C 3 Below: 3.0%

[0042] C 4 Above fraction: 31.1%

Embodiment 3

[0044] As shown in Figure 1, the composition of the carbon-containing olefin mixture is the same as in Example 1. Adopt technological process of the present invention, catalyst is silicon aluminum ratio (SiO 2 / Al 2 o 3 ) 200 ZSM-5 molecular sieve, the reaction weight hourly space velocity is 100 hours -1 , the reaction temperature is 550°C, the reaction pressure is 0.30MPa, the temperature after the partial condenser 5 is 55°C, the cracked product is compressed to 0.65MPa, 88% by weight of C 4 Distillate recycle, will obtain the product (weight %) of following ratio:

[0045] Ethylene: 23.5%

[0046] Propylene: 45.3%

[0047] Other C 3 Below: 3.5%

[0048] C 4 Above fraction: 27.7%.

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Abstract

This invention relates to a method for preparing lightweight olefins from carbon-containing olefins by catalytic cracking. The method solves the problems of low added value of carbon-containing olefin mixture, low catalytic cracking conversion rate, and low associativity of catalytic cracking process faced by the previous technique. The method comprises: (1) gasifying and preheating liquid-phase carbon-containing olefin mixture by heat exchange with cracking products, and heating to the reaction temperature with a heating furnace; (2) partially condensing the cracking products, and separating C5 or higher fractions; (3) compressing the rest cracking products to 0.3-1.1 MPa, sending into a depropanizer, separating, sending C3 or lower fractions obtained at the overhead to an ethylene apparatus, and separating to obtain propylene and ethylene; (4) sending C4 or higher fractions into a debutanizer, sending 30-90 wt.% of C4 fraction obtained at the overhead to the reactor, and cracking again. The method can be used in industrial production of lightweight olefins such as propylene and ethylene.

Description

technical field [0001] The invention relates to a method for preparing light olefins 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 technology specia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C11/06C07C4/06
CPCY02P20/52
Inventor 谢在库杨为民宗弘元甘永胜钱宏义
Owner CHINA PETROLEUM & CHEM CORP
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