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Separation utilization method for preparing ethene by-product C9+ fractioning by cracking

A technology of cracking to produce ethylene and by-products, applied in distillation purification/separation, organic chemistry, etc., can solve the problems of intensified polymerization and coke reaction, failure to extract DCPD, etc.

Active Publication Date: 2010-07-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If directly splitting C 9 + As a raw material, the above method is used to separate cyclopentadiene. There are many active components close to the boiling point of DCPD in the raw material. Polymerization and coking reactions will intensify at the temperature of heating and cracking DCPD, which will lead to 9 + Failed to extract DCPD from

Method used

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  • Separation utilization method for preparing ethene by-product C9+ fractioning by cracking
  • Separation utilization method for preparing ethene by-product C9+ fractioning by cracking
  • Separation utilization method for preparing ethene by-product C9+ fractioning by cracking

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] According to the flow chart in Figure 1, the cracking C with the composition shown in Table 1 heated to 90°C 9 + The distillate is sent to vacuum rectification tower E-3 at a speed of 50g / h, the pressure of the control tower is 0.01MPa, the temperature at the top of the tower is 60-70°C, and the temperature at the bottom of the tower is 95-105°C. The styrene fraction obtained at the top of the tower was distilled out at a rate of 8g / h, and the contents of its main components are shown in Table 2. The bottom cut is discharged from the vacuum rectification tower at a rate of 42g / h, and the main component content of the bottom cut is shown in Table 3.

[0030] The bottom fraction is heated to 220°C by heat exchanger E-2 for 20 minutes, and then sent to atmospheric distillation column E-1. The temperature at the top of the atmospheric distillation tower is controlled at 40-42° C., so that cyclopentadiene, which has the lowest boiling point, is distilled from the top of th...

example 2

[0032] Isolation and cracking C by the method of example 1 9 + Distillate, the difference is that the bottom fraction of vacuum distillation tower E-3 is heated to 260 °C and then sent to atmospheric distillation tower E-1, and the reflux ratio of the second side line of atmospheric distillation tower is controlled to be 2:1 . The contents of each fraction obtained by atmospheric distillation and the second vacuum distillation are shown in Table 4, and the main substance contents of each fraction are shown in Table 5.

example 3

[0034] Isolation and cracking C by the method of example 1 9 + The different components of the fraction are that the indene fraction from the third side stream of the atmospheric rectification tower is condensed and partly refluxed with a reflux ratio of 2:1, partly discharged from the pipeline P-7. The contents of each fraction obtained by atmospheric distillation and the second vacuum distillation are shown in Table 4, and the main substance contents of each fraction are shown in Table 5.

[0035] Table 1

[0036] component name

Content, mass%

Cyclopentadiene

0.52

[0037] component name

Content, mass%

Methylcyclopentadiene

0.19

benzene

0.10

toluene

-

Ethylbenzene

-

p-, m-xylene

-

Styrene

7.79

O-xylene

2.45

propenylbenzene

-

n-Propylbenzene

-

methyl ethyl benzene

1.73

C 9 Aromatics

1.90

C ...

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Abstract

The invention relates to a method of separating and utilizing ethylene by product C9<+> distillate produced by cracking, and consists of the procedures: the C9<+> distillate is separated into ethylene distillate with rich benzene and distillate at the bottom of a rectifying tower by rectifying under reduced pressure; the distillate at the bottom of the rectifying tower is heated to 180 - 380DEG Cand rectified under normal pressure; cyclopentadiene distillate, methyl cyclopentadiene distillate, distillate with rich dicyclopentadiene, distillate with high content of indene and heavy end distillate are separated from the top of the rectifying tower to the bottom of the rectifying tower in turn. With the method, not only high quality petroleum resin is available, but cyclopentadiene and methyl cyclopentadiene can also be obtained at the same time.

Description

technical field [0001] The invention is a cracking ethylene by-product C 9 + The separation utilization method of fraction, specifically, is a kind of from said C 9 + A method for separating and producing petroleum resin raw materials from fractions, and simultaneously extracting cyclopentadiene and methylcyclopentadiene. Background technique [0002] C by-product of cracking ethylene plant 9 + Fraction (referred to as cracking C 9 + or split C 9 ) is extracted and separated from naphtha or light oil cracking product C 5 Fraction, C 6 ~C 8 The remaining fraction after the fraction (by hydrogenation to produce BTX) accounts for about 10% to 20% of the total ethylene output. With the increase of my country's ethylene production capacity year by year, fully and effectively utilize the by-product cracking C in ethylene production 9 + , comprehensively excavating their potential utilization value will become an important issue facing the petroleum refining industry. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/04C07C13/45C07C13/47C07C13/15C07C15/46
Inventor 葸雷董忠杰王建伟谢红霞果卉
Owner CHINA PETROLEUM & CHEM CORP
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