Method for preparing propylene by using cracking C5 fraction

A technology for cracking carbon and propylene, which is applied in the direction of double decomposition reaction to produce hydrocarbons, chemical instruments and methods, hydrocarbons, etc. It can solve the problems of low propylene weight yield, save hydrogen, increase weight yield, and increase propylene yield Effect

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The technical problem to be solved by the present invention is the problem of low propylene weight yield in the prior art, and a new method for cracking carbon five fractions to produce propylene is provided

Method used

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  • Method for preparing propylene by using cracking C5 fraction
  • Method for preparing propylene by using cracking C5 fraction
  • Method for preparing propylene by using cracking C5 fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] according to figure 1 Shown technological process, the component of cracking C5 fraction is as shown in table 1, obtains the C5 fraction not containing cyclopentadiene after decyclopentadiene unit removes the cyclopentadiene in raw material, removes The carbon five distillate components of dicyclopentadiene are as shown in Table 1, and then contacted with a selective hydrogenation catalyst to obtain a mono-olefin carbon five stream, and its components are as shown in table 1, and the mono-olefin carbon five stream and the out-of-boundary Fresh ethylene is mixed to form a mixed raw material. The mixed raw material is treated by an adsorbent in the adsorption tower to remove impurities in the raw material. The treated material is contacted with the disproportionation catalyst in the disproportionation reactor to react, and the reaction produces the target product propylene, unreacted ethylene And carbon five olefins, the reaction product is separated by a deethylene tower...

Embodiment 2～6

[0042] React by each condition and step of embodiment 1, just change different operation parameter, select the component of hydrogenation catalyst, adsorbent and disproportionation catalyst as shown in table 2, the operating condition of decyclopentadiene unit is as shown in table 3 As shown, the operating conditions of the selected hydrogenation reactor and the disproportionation reactor are shown in Table 4, the operating conditions of the deethylene tower and the depropylene tower are shown in Table 5, and the reaction results are shown in Table 6.

[0043]

Embodiment 7

[0045] according to figure 1 The process flow shown is just an isomerization reactor added between 22 and 23. The components of the cracked C5 fraction are shown in Table 1. The cracked C5 fraction is removed from the cyclopentadiene in the raw material by the decyclopentadiene unit to obtain the C5 fraction without cyclopentadiene, and the dicyclopentadiene is removed. The C5 fraction of diene is as shown in Table 1, and then contacted with a selective hydrogenation catalyst to obtain a monoolefin C5 stream, its components are as shown in Table 1, and the monoolefin C5 stream is first sent to the isomerization reaction device, the reaction is to obtain a stream rich in 2-methyl-2-butene and 2-pentene, which is then mixed with fresh ethylene outside the boundary area to form a mixed raw material, which is treated by the adsorbent in the adsorption tower Finally, the impurities in the raw material are removed, the treated material is contacted with the disproportionation catal...

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Abstract

The invention relates to a method for preparing propylene by using a cracking C5 fraction. The problem of low mass yield of propylene in the prior art is mainly solved. The method for preparing propylene by using cracking C5 fraction, adopting the cracking C5 fraction and ethylene as raw materials, comprises the following steps: sending the cracking C5 fraction to a cyclopentadiene removal unit, reacting, separating to obtain a cyclopentadiene removed C5 flow, sending the cyclopentadiene removed C5 flow to a selective hydrogenation reactor, selectively hydrogenating diolefin in the presence of a hydrogenation catalyst and hydrogen to obtain monoolefin, mixing the obtained monoolefin C5 material with ethylene, processing by an adsorbent, allowing the obtained adsorption flow to contact and react with a disproportionation catalyst to obtain a flow containing a product propylene, unreacted ethylene and C5, and separating to obtain propylene. The method well solves the problem, and can be used in the industrial production for preparing propylene by using the cracking C5 fraction.

Description

technical field [0001] The invention relates to a method for cracking carbon five fractions to produce propylene. Background technique [0002] The invention relates to a method for comprehensively utilizing cracked C5 fractions, in particular, the invention relates to a method for comprehensively utilizing cracked C5 fractions to produce ethylene and propylene. [0003] About 15-20% of carbon five fractions are by-produced in the process of petroleum cracking to ethylene. With the continuous expansion of ethylene plants and the continuous improvement of production capacity, the by-product cracked C5 fraction is also increasing. How to comprehensively and effectively use this fraction is a common concern of various petroleum and petrochemical enterprises today. And as the benefit improvement space of ethylene plants gradually shrinks, all enterprises are also forced to turn their attention to the comprehensive utilization of this part of the distillate, rather than just sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C6/04C07C13/61C07C7/13C07C7/177C07C7/163C07C7/00
Inventor 宣东刘苏董静
Owner CHINA PETROLEUM & CHEM CORP
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