Separation method of diene hydrocarbon in five fractions of petroleum cracked carbon

A C5 fraction and petroleum cracking technology, applied in hydrocarbon purification/separation, distillation purification/separation, chemical instruments and methods, etc., can solve the loss of isoprene and cyclopentadiene, the purity of dicyclopentadiene products Low cost, low utilization value and other problems, to achieve the effect of improving conversion rate, avoiding self-polymerization and copolymerization loss, and low operating cost

Active Publication Date: 2008-01-23
CHINA PETROCHEMICAL CORP +1
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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 diolefins in the C5 fraction in the prior art, when the raw material first passes through a thermal dimerization reactor to generate dicyclopentadiene to separate cyclopentadiene, isoprene undergoes self-polymerization And co-polymerization with cyclopentadiene, resulting in a large loss of isoprene and cyclopentadiene; at the same time, the dicyclopentadiene product has low purity and low utilization value, providing a new method for separating and cracking diolefins in the C5 fraction Methods

Method used

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  • Separation method of diene hydrocarbon in five fractions of petroleum cracked carbon

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Effect test

Embodiment 1

[0047] According to the technological process shown in Fig. 1, the C5 fraction 13 of raw petroleum cracking enters the middle part of the isoprene separation tower 2 from the 55th tray, and the stream I rich in isoprene is obtained by separation at the top of the tower, and the stream I rich in isoprene is obtained by separation at the bottom of the tower. Stream II of cyclopentadiene and piperylene. The feed temperature of isoprene separation tower 1 is 50°C, the number of trays is 110, the temperature of the tower bottom is 79°C, the temperature of the top of the tower is 52°C, the pressure of the top of the tower is 0.09MPa, the pressure of the bottom of the tower is 0.17MPa, and the reflux The ratio is 11. The polymerization inhibitor is diethylhydroxylamine.

[0048] Stream I enters the 80th tray in the middle part of the first extractive distillation tower 3, contacts with the dimethylformamide solvent entering from the 6th tray of the tower for extractive distillation,...

Embodiment 2

[0070] According to the technical process of [Example 1], just before the C5 fraction of raw material cracking enters the isoprene separation tower 2, it enters from the 44th tray in the middle part of the light removal tower 1, and rectification separation is carried out, and the top of the tower is removed C4 and components below C4, the C5 stream XI in the tower kettle enters the middle part of the isoprene separation tower 2 . Light removal tower 1 has 75 plates, feed temperature is 50°C, tower bottom temperature is 76°C, tower top temperature is 49°C, tower top pressure is 0.15MPa, tower bottom pressure is 0.20MPa, and reflux ratio is 20 . The polymerization inhibitor ortho-nitrophenol enters the tower together with the C5 raw material.

[0071] The solvent A in the first extractive distillation column and the solvent B in the second extractive distillation column are acetonitrile, and the polymerization inhibitor is nitrogen methyl pyrrolidone; The polymerization inhibi...

Embodiment 3

[0091] According to the technical process of [Example 2], only the solvent A in the first extractive distillation column is dimethylacetamide, and the polymerization inhibitor is a composite polymerization inhibitor of sodium nitrite and ethanolamine, wherein the quality of sodium nitrite and ethanolamine The ratio is 10:1, and the carbon pentayl concentration of ethanolamine is 160 ppm. The solvent B in the second extractive distillation tower is nitrogen methyl pyrrolidone, the polymerization inhibitor is nitrobenzene, and the polymerization inhibitor in the separation process of other solvent-free existence is tert-butyl quinone.

[0092] The purity of piperylene was 68.99%, and the purity of dicyclopentadiene was 90.32%.

[0093] The operating conditions of each unit are shown in Table 4, and the weight percentage composition of raw materials and components of each unit is shown in Table 5.

[0094] Table 4

[0095] operating conditions

Light removal tower 1...

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Abstract

The invention relates to a separation method of the diolefin in the petroleum cracking C5 fraction, which mainly solves the problems that the cracking C5 fraction in the past technology generates the dicyclopentadiene via the thermal dimerization reactor, the isoprene does self-polymerization and does copolymerization with the cyclopentadiene to cause great loss of the isoprene and the cyclopentadiene, at the same time the dicyclopentadiene has low product purity and low utilization value. The invention better solves the problem through the technical proposal that the isoprene in the C5 fraction is separated with the cyclopentadiene and the cyclopentadiene enters the thermal dimerization reactor to generate the dicyclopentadiene and separate with the m-pentadiene, which can be used in the industrial production of the diolefin separation in the cracking C5 fraction.

Description

technical field [0001] The invention relates to a method for separating diolefins in C5 fractions of petroleum cracking. 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): C07C7/08C07C7/177C07C7/04C07C11/18C07C11/173C07C13/61
Inventor 葛春方沙裕杨署生华峰李勇
Owner CHINA PETROCHEMICAL CORP
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