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Postheating dimerization method for separating C5 diene

A thermal dimerization and diene technology, applied in the field of post-thermal dimerization separation of carbon pentadiene, can solve problems affecting the purity of dicyclopentadiene, loss of isoprene and cyclopentadiene, etc., to avoid self-polymerization And copolymerization loss, increase conversion rate, reduce the effect of temperature control requirements

Active Publication Date: 2008-01-09
SINOPEC SHANGHAI ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is that when separating and cracking the diolefins in the C5 fraction in the prior art, the raw material must first generate dicyclopentadiene to separate cyclopentadiene through a thermal dimerization reactor, and isoprene occurs automatically Polymerization and copolymerization with cyclopentadiene, resulting in a large loss of isoprene and cyclopentadiene, and the problem of affecting the purity of dicyclopentadiene, providing a new method for separating carbon pentadienes after thermal dimerization

Method used

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  • Postheating dimerization method for separating C5 diene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]According to the technological process shown in Fig. 1, the C5 fraction of raw petroleum cracking enters the 55th plate of the isoprene separation tower 1, and the stream I rich in isoprene is obtained by separation at the top of the tower, which also contains monoolefins, alkanes, Alkynes and a small amount of cyclopentadiene; the stream II containing heavy components such as cyclopentadiene and piperylene is separated from the bottom of the tower. The feed temperature of isoprene separation tower 1 is 50°C, the number of trays is 110, 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.

[0027] Stream II enters thermal dimerization reactor 2 for thermal dimerization reaction, and the reactor volume is 40 meters 3 (The C5 raw material is calculated at 20 kg / hour, the same below), the reaction temp...

Embodiment 2

[0037] According to the technical process of Fig. 2, raw petroleum cracking C5 fraction and polymerization inhibitor diethylhydroxylamine enter the 44th plate of light removal tower 3, and the stream IV containing C4 and components below C4 is obtained at the top of the tower; Obtain C5 stream V. The number of trays in the light removal tower 3 is 75, the feed temperature is 68°C, the temperature of the tower bottom is 76°C, the temperature of the top of the tower is 49°C, the pressure of the top of the tower is 0.15MPa, the pressure of the bottom of the tower is 0.20MPa, and the reflux ratio is 20 .

[0038] The carbon five stream V obtained from the bottom of light removal tower 3 enters the 43rd plate of isoprene separation tower 1, and the stream I rich in isoprene is obtained by separation at the top of the tower, which also contains monoolefins, alkanes, and alkynes Hydrocarbons and a small amount of cyclopentadiene; the tower still separates stream II containing heavy ...

Embodiment 3～4

[0049] According to the technological process of Fig. 2, just the polymerization inhibitor used in [embodiment 3] is dihydroxydihydrocinnamic acid, and the polymerization inhibitor used in [embodiment 4] is o-nitrophenol. Raw materials and the weight percent composition of each unit component are shown in Table 4 (Example 3) and Table 5 (Example 4) respectively.

[0050] table 3

[0051]

operating conditions

Lightening tower 3

Isoprene separation tower 1

Thermal dimerization reactor 2

Example 3

Example 4

Example 3

Example 4

Example 3

Example 4

Feed temperature (°C)

35

60

-

-

-

-

The number of trays at the feed (blocks)

35

50

66

78

-

-

Total number of plates (blocks)

60

90

130

150

-

-

Tower kettle temperature (°C)

70

83

80

...

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Abstract

A method for separating C-5-diene-hydrocarbon from after-heating dimerization is carried out by cracking C-5 fraction to enter into middle of isoprene separating tower 1, separating at tower top to obtain material circulation Icontaining isoprene, separating to obtain isoprene, separating by tower to obtain material circulation IIcontaining cyclopentadiene and metapentadiene, entering material circulation IIinto thermal dimmer reactor 2 to generate material circulation III containing bicyclo-pentylene, after-refining and separating to obtain final product. It has less loss and better purity.

Description

technical field [0001] The invention relates to a method for separating carbon pentadienes by post-thermal dimerization. Background technique [0002] In the process of producing ethylene from petroleum cracking, a considerable amount of C5 fraction is produced by-product, and the C5 fraction is 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 the C5 fraction 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] The cracked C5 distillate is composed of more than 20 components with similar boiling points and easy to form azeotropes with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C13/15C07C13/61C07C11/18C07C7/04C07C7/177
Inventor 葛春方杨署生徐德勤
Owner SINOPEC SHANGHAI ENG
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