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Method for separating piperylene from petroleum cracking C5 fraction

A technology of petroleum cracking and piperylene, applied in distillation purification/separation, chemical instruments and methods, hydrocarbon purification/separation, etc., can solve the problem of high energy consumption and achieve the effect of reducing energy consumption

Active Publication Date: 2015-05-06
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to overcome the defect of higher energy consumption in the process of improving the yield of piperylene products in the prior art, and provide a kind of piperylene product with higher purity and energy saving from petroleum cracking C5 cuts Method for separating piperylene

Method used

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  • Method for separating piperylene from petroleum cracking C5 fraction
  • Method for separating piperylene from petroleum cracking C5 fraction
  • Method for separating piperylene from petroleum cracking C5 fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] according to figure 1 The technological process, the crude oil cracking C5 fraction enters the 75th plate of the isoprene separation tower 1, and the top of the tower is separated to obtain a stream I rich in isoprene, which also contains monoolefins, alkanes, alkynes and a small amount The cyclopentadiene; the tower still separates the stream II containing heavy components such as cyclopentadiene and piperylene. The feed temperature of isoprene separation tower 1 is 50°C, the number of trays is 160, the temperature of the tower bottom is 84°C, the temperature of the top of the tower is 54°C, the pressure of the top of the tower is 0.13MPa, the pressure of the bottom of the tower is 0.21MPa, and the reflux The ratio is 11.

[0053] Stream II enters the first thermal dimerization reactor 2 to carry out the thermal dimerization reaction. The volume of the reactor is 40 cubic meters (the raw material petroleum cracking C5 fraction is calculated at 15,000 kg / hour, the same...

Embodiment 2-4

[0075] according to figure 1 The technological process is to separate piperylene from raw petroleum cracking C5 fraction. The difference is that the separation conditions of each tower and the operating conditions of the reactor are shown in Table 2. The recovery rates of piperylene are 93.92%, 93.97 and 93.12%, respectively, the heat of the bottom of the heavy removal tower 5 is 71.7, 41.1 and 50.6kW / ton of raw material oil, and the cooling capacity of the top of the heavy removal tower 5 is 76.8 , 65.5 and 71.2kW / ton feedstock oil, the composition and other product properties of feedstock petroleum cracking C5 fraction are shown in Table 3 (Example 2), Table 4 (Example 3) and Table 5 (Example 4) respectively.

[0076] Table 2

[0077]

[0078] table 3

[0079]

[0080] Table 4

[0081]

[0082] table 5

[0083]

[0084] As can be seen from the results of the above Examples 1-4, the method of the present invention can effectively realize the separation between...

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Abstract

The invention discloses a method for separating piperylene from a petroleum cracking C5 fraction. The method comprises the following steps: (a) the petroleum cracking C5 fraction is delivered into an isoprene separation tower (1) and is subjected to separation, such that a material flow (I) rich in isoprene is separated and is obtained from the tower top, and a material flow (II) rich in cyclopentadiene and piperylene is separated and is obtained from the tower bottom; (b) the material flow (II) is delivered into a first thermal dimerization reactor (2) and is subjected to a thermal dimerization reaction, such that a material flow (III) rich in dicyclopentadiene is produced; (c) the material flow (III) is delivered into a de-dicyclization tower (3) and is subjected to separation, such that a dicyclopentadiene material flow (V) is separated; the remaining material (IV) is delivered into a second thermal dimerization reactor (4) and is subjected to a thermal dimerization reaction, such that a material flow (VI) containing trace cyclopentadiene is obtained; and (d) the material flow (VI) is delivered into a de-heavy tower (5), and a piperylene product material flow (VII) is obtained from the tower top. With the method provided by the invention, energy consumption can be effectively reduced; the piperylene product with relatively high purity can be obtained; and the piperylene and dicyclopentadiene products can be obtained with relatively high yield.

Description

technical field [0001] The invention relates to a method for separating piperylene from petroleum cracking C5 fraction. Background technique [0002] A considerable number of C5 fractions are by-produced in the process of petroleum cracking to ethylene, and the C5 fractions are rich in dienes such as isoprene, piperylene and cyclopentadiene. These diolefins are chemically active and are important chemical raw materials. Due to the differences in raw materials, cracking depth and separation degree of petroleum hydrocarbon cracking, the content of diolefins in C5 fractions is different, but the total amount is between 40% and 60%. Therefore, the separation and utilization of C5 fractions has far-reaching significance for improving the economic benefits of ethylene plants and comprehensively utilizing petroleum resources. [0003] Due to the early development and wide application of isoprene among the three C5 diolefins of isoprene, piperylene and cyclopentadiene, the earlier...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/20C07C7/04C07C7/177C07C11/18C07C13/61
Inventor 葛春方杨兆银沙裕吴德荣王江义李真泽张斌徐德勤
Owner SINOPEC SHANGHAI ENG
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