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Method for preparing propylene by catalytic cracking olefin of containing carbon

A technology of catalytic cracking and carbon olefins, which is applied in the direction of hydrocarbon cracking to produce hydrocarbons and organic chemistry, etc. It can solve the problems of weak combination of olefin catalytic cracking process, low conversion rate of olefin catalytic cracking, low added value of carbon-containing olefin mixture, etc. problems, achieve good combinability, save energy, and improve the conversion rate of olefins

Active Publication Date: 2010-05-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the added value of the carbon-containing olefin mixture is not high, the conversion rate of the olefin catalytic cracking is not high, and the combination of the olefin catalytic cracking process is not strong in the prior art, and a new carbon-containing olefin mixture is provided. The method of pyrolysis to produce propylene

Method used

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  • Method for preparing propylene by catalytic cracking olefin of containing carbon
  • Method for preparing propylene by catalytic cracking olefin of containing carbon
  • Method for preparing propylene by catalytic cracking olefin of containing carbon

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Embodiment 1

[0032] according to figure 1 As shown, the carbon-containing olefin mixture feed composition (weight %) is: butene-1: 45%, butane: 35%, pentene-1: 10%, pentane: 10%. Adopt technological process of the present invention, catalyst is silicon aluminum ratio (SiO 2 / Al 2 o 3) 200 ZSM-5 molecular sieve, the steam to feed weight ratio is 1.5, the reaction temperature is 450°C, the reaction pressure is 0.06MPa, the temperature behind the cooler 6 is 35°C, the cracked product is compressed to 0.8MPa, 88% by weight C 4 Distillate recycle, the pilot plant proves that the following proportions of products (% by weight) will be obtained:

[0033] Ethylene: 22.6%

[0034] Propylene: 42.1%

[0035] Other C 3 Below: 3.0%

[0036] C 4 Above fraction: 32.3%

Embodiment 2

[0038] according to figure 1 Shown, carbon-containing olefin mixture feed composition is with embodiment 1, adopts technical process of the present invention, and catalyst is silicon-aluminum ratio (SiO 2 / Al 2 o 3 ) 200 ZSM-5 molecular sieve, the steam to feed weight ratio is 2.0, the reaction temperature is 500°C, the reaction pressure is 0.20MPa, the temperature behind the cooler 6 is 55°C, the cracked product is compressed to 0.65MPa, 68% by weight C 4 Distillate recycle, will obtain the product (weight %) of following ratio:

[0039] Ethylene: 20.2%

[0040] Propylene: 45.0%

[0041] Other C 3 Below: 2.8%

[0042] C 4 Above fraction: 32.0%

Embodiment 3

[0044] according to figure 1 Shown, carbon-containing olefin mixture feed composition is with embodiment 1, adopts technical process of the present invention, and catalyst is silicon-aluminum ratio (SiO 2 / Al 2 o 3 ) 200 ZSM-5 molecular sieve, the steam to feed weight ratio is 3.5, the reaction temperature is 550°C, the reaction pressure is 0.3MPa, the temperature behind the cooler 6 is 75°C, the cracked product is compressed to 1.0MPa, 48% by weight C 4 Distillate recycle, will obtain the product (weight %) of following ratio:

[0045] Ethylene: 18.8%

[0046] Propylene: 43.3%

[0047] Other C 3 Below: 3.6%

[0048] C 4 Above fraction: 34.3%.

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Abstract

This invention relates to a method for preparing propylene by catalytic cracking of hydrocarbons. The method solves the problems of low added value, low conversion rate and low associativity of catalytic cracking process faced by traditional technique. The method comprises: gasifying liquid-phase hydrocarbon mixture by heat exchange with catalytic cracking product, mixing with overheated diluted steam to reach the reaction temperature, performing heat exchange between catalytic cracking product and condensed steam, passing through an air cooler and a cooler for cooling and separating out condensed steam, performing heat exchange between condensed steam and catalytic cracking product, utilizing as the heat source for the following debutanization and depropanization columns, compressing thecatalytic cracking product to 0.3-1.1 MPa, sending into the depropanization column, separating to obtain C3 or below fractions at the overhead, separating with an ethylene apparatus to obtain propylene and ethylene, sending C4 or higher fractions at the bottom into the debutanization column, separating C4 fractions at the overhead, and recycling 30-90 wt.% into the reactor.

Description

technical field [0001] The invention relates to a method for producing propylene 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 specially ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C4/06
Inventor 甘永胜钱宏义沈伟胡力智何志
Owner CHINA PETROLEUM & CHEM CORP