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Method and equipment for separating diolefin component in oil cracking ethylene byproduct carbon-5 fraction

A technology of by-product C5 fraction and C5 fraction, applied in distillation purification/separation, addition of unsaturated hydrocarbons to hydrocarbons, organic chemistry, etc., can solve the problems of complicated separation methods and poor separation effects, and achieve broaden Application range, easy reaction and stable control, enhanced heat transfer effect

Active Publication Date: 2012-06-27
DAQING HUAKE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of complex separation methods and poor separation effects in the prior art, the present invention provides a method for separating diolefin components in the by-product C5 fraction of petroleum cracking ethylene, which can greatly reduce the separated The content of cyclopentadiene in isoprene can reduce the self-polymerization or copolymerization of isoprene in dicyclopentadiene

Method used

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  • Method and equipment for separating diolefin component in oil cracking ethylene byproduct carbon-5 fraction
  • Method and equipment for separating diolefin component in oil cracking ethylene byproduct carbon-5 fraction
  • Method and equipment for separating diolefin component in oil cracking ethylene byproduct carbon-5 fraction

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Embodiment 1

[0057] Such as Figure 5 As shown, the cracked C5 fraction enters the light removal tower 1, and the light components containing carbon four hydrocarbons are removed through the top of the light removal tower 1, and the material separated from the light removal tower enters the first-stage reactor, and the reaction temperature is 85- Thermal dimerization reaction is carried out at 100°C and the reaction pressure is 0.75-0.90MPa, so that the cyclopentadiene in the material is dimerized into dicyclopentadiene, and then the material enters the first de-weighting tower, and is separated at the top of the tower to obtain isoprene-rich and the material of piperylene, the tower still is separated to obtain the material rich in dicyclopentadiene. The material separated at the top of the first weight removal tower enters the deisoprene tower after being cooled, and the crude isoprene product separated at the top of the tower leaves the factory, and is separated at the bottom of the tow...

Embodiment 2

[0067] The equipment and method used in this embodiment are basically the same as in Example 1, the difference is that a dicyclopentadiene de-weighting tower is also provided after the dicyclopentadiene removal tower, and the tower still material of the dicyclopentadiene removal tower enters the double ring Deweighting is carried out in the pentadiene deweighting tower, the dicyclopentadiene product is obtained by separation at the top of the tower, and the heavy component is separated from the bottom of the tower. The theoretical plate number of the dicyclopentadiene weight removal tower is 40, the temperature at the top of the tower is 97°C, the temperature at the bottom of the tower is 120°C, the pressure inside the tower is controlled between -0.08 and -0.09MPa, and the reflux ratio is 5. In addition, the first-stage reactor in this embodiment is provided with three thermal dimerization reactors connected in series, and each thermal dimerization reactor is equipped with a t...

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Abstract

The invention provides a separation method of diolefin in carbon-5 aiming at the problem of high content of cyclopentadiene in isoprene when the diolefin in carbon-5 is separated by utilizing the post-heating dimerization method. The method comprises the following steps of: carrying out thermal dimerization reaction for two times, carrying out heavy removal for two times and removing the cyclopentadiene in the carbon-5 by using a special thermal dipolymer reactor. The content of the cyclopentadiene in the isoprene prepared by adopting the method is below 1 percent (weight), and meanwhile, thecontent of cyclopentadiene in produced piperylene is less than 1 percent (weight); and the content of an isoprene autopolymer or an isoprene copolymer in dicyclopentadiene can reach the level of a post-heating dimerization carbon-5 separation technology. The invention also discloses equipment for implementing the separation method at the same time.

Description

technical field [0001] The invention relates to a method and equipment for separating diolefin components in the by-product C5 fraction of petroleum cracking ethylene. Background technique [0002] In the process of petroleum cracking ethylene, a considerable amount of carbon five fractions is produced by-product, and the output is generally about 10% to 20% of the ethylene output. The C5 fraction contains more than 30 kinds of hydrocarbon components, among which three diolefins with the most utilization value are piperylene, isoprene and cyclopentadiene. Due to their special molecular structure and active chemical properties, these diolefins are important chemical raw materials. Due to the differences in cracking raw materials, cracking depth and separation degree of petroleum hydrocarbons, 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 signif...

Claims

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Application Information

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IPC IPC(8): C07C11/18C07C11/20C07C13/61C07C7/04C07C2/50
Inventor 万志强王禹张好宽姜金堂张贺东郭文革王威龙周洪柱杨玉梅
Owner DAQING HUAKE
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