Method for producing propylene by using cracking olefin of carbon four and higher

An olefin and propylene technology, which is applied in the field of adiabatic multi-stage composite fixed-bed reactor for propylene production, can solve the problems of low yield, short catalyst regeneration period, low propylene selectivity and the like

Active Publication Date: 2008-07-02
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the target product propylene has low selectivity, low yield, and short catalyst regeneration period in the current technology, and a method for preparing propylene by cracking olefins with carbon four and above is provided

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  • Method for producing propylene by using cracking olefin of carbon four and higher

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Embodiment 1

[0016] The method for producing propylene by cracking olefins of 100,000 tons / year C4 and above is as follows: figure 1 Shown is a two-stage composite fixed-bed reactor. Reactor diameter D = 1700 mm, tangent height 7400 mm, first stage catalyst bed height H 1 =980mm, the second stage catalyst bed height H 2 =700mm, the first stage reaction temperature is 470℃, the space velocity is 8.6 hours -1 , The second stage reaction temperature is 550℃, space velocity is 12 hours -1 , Total airspeed 5 hours -1 , Using the molar ratio of silicon to aluminum (SiO 2 / Al 2 O 3 ) Is 200 ZSM-5 molecular sieve catalyst, the reaction raw material is ethylene plant etherified carbon four, the main target product propylene yield and conversion rate change with time are shown in Table 1, after 250 hours, the conversion rate decreased from 71.69% to 57.03 %, but the selectivity of propylene is improved, and the propylene yield is stable at 21.0-23.0% and basically unchanged.

[0017] Table 1 Changes in ...

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Abstract

This invention relates to a method for manufacturing propylene by C4+ alkenes catalytic cracking. The method adopts a mixture containing ore or more C4+ alkenes as the raw material, and contacts the raw material with a crystalline aluminosilicate catalyst with SiO2 / Al2O3 mol ratio not lower than 10 in a two-stage catalyst bed layer to obtain an effluent containing propylene. The reactor comprises an inlet pipe, a gas-distributor, a first catalyst bed layer, an intermediate heat exchanger, a second catalyst bed layer and an outlet pipe. The method solves the problems of low propylene selectivity, low yield and short catalyst regeneration period, and can be used in propylene industrial manufacture by C4+ alkenes catalytic cracking.

Description

Technical field [0001] The invention relates to a method for preparing propylene by cracking C4 and above olefins. More specifically, it relates to a method for preparing propylene by adopting an adiabatic multi-stage composite fixed-bed reactor through the catalytic cracking of C4 and above olefins. Background technique [0002] At present, there are a considerable amount of C4 and above olefin raw materials worldwide. Affected by factors such as changes in the chemical product market and transportation costs, in-situ deep processing of these raw materials is a better way to use them. The conversion of C4 and above olefins to propylene is a promising process. On the one hand, the process can use relatively low excess value-added C4 and above olefin raw materials, on the other hand, it can obtain a wide range of propylene products, and the by-product ethylene makes the process more attractive. [0003] The main advantage of the fixed bed reactor is that the fluid flow in the bed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C4/06
CPCY02P20/584
Inventor 谢在库钟思青刘俊涛袁艳辉
Owner CHINA PETROLEUM & CHEM CORP
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