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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 propylene selectivity, short catalyst regeneration period and low yield, etc.

Active Publication Date: 2007-02-21
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] 100,000 tons / year C4 and above olefin cracking method to prepare propylene adopts such as 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 =980 mm, height H of catalyst bed in the second stage 2 =700 mm, the first stage reaction temperature is 470°C, and the space velocity is 8.6 hours -1 , the second reaction temperature is 550°C, and the space velocity is 12 hours -1 , total airspeed 5 hours -1 , using the silicon-aluminum molar ratio (SiO 2 / Al 2 o 3 ) is the ZSM-5 type molecular sieve catalyst of 200, and the reaction raw material is etherified carbon four in ethylene factory, and the yield of main purpose product propylene and the change of conversion rate are shown in Table 1, and conversion rate drops to 57.03% from 71.69% after 250 hours %, but the selectivity of propylene is improved, and the yield of propylene is stable at 21.0-23.0%, basically unchanged....

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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 olefins with carbon four or more. More specifically, it relates to a method for producing propylene by using an adiabatic multi-stage composite fixed-bed reactor for catalytic cracking of olefins with carbon four or more. Background technique [0002] At present, there is a considerable amount of C4 and above C4 olefin raw materials in the world. Affected by factors such as changes in the chemical product market and transportation costs, deep processing of these raw materials on site is a better way to utilize them. Among them, the conversion of C4 and above olefins to propylene is a promising process. On the one hand, this process can utilize C4 and above C4 olefin raw materials with relatively low added value, and on the other hand, it can obtain propylene products with a wide range of uses. At the same time, the by-product ethylene makes the proces...

Claims

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Application Information

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Patent Type & Authority Applications(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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