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Method for separating isoprene by front-end hydrogenation one-stage extraction

A technology of isoprene and pre-hydrogenation, which is applied in chemical instruments and methods, distillation purification/separation, hydrocarbon purification/separation, etc., can solve the problems of large solvent loss, difficult operation, unsafety, etc., and achieve easy operation , Simple operation and low energy consumption

Active Publication Date: 2008-11-12
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of high energy consumption, difficult operation, easy blockage, large solvent loss and unsafety in the existing second extraction unit, the present invention proposes a method for one-stage extraction and rectification to separate and crack C5 fractions. The method utilizes rectification The method removes cyclopentadiene and uses azeotropic distillation to remove alkynes, and the product of polymer grade isoprene can be obtained without a second extraction unit

Method used

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  • Method for separating isoprene by front-end hydrogenation one-stage extraction
  • Method for separating isoprene by front-end hydrogenation one-stage extraction
  • Method for separating isoprene by front-end hydrogenation one-stage extraction

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Embodiment 1

[0047] Using the cracked C5 fraction of Yanshan Petrochemical Company as raw material, the separation method of the present invention is used to separate the cracked C5 fraction. The composition of the raw material and the composition of the incoming and outgoing materials of each operating device are listed in Table 1 below.

[0048] (1) Pretreatment unit: 31,000kg / h of cracked C5 fraction enters the dimerization reactor R-101 for dimerization reaction at 80-85°C to dimerize cyclopentadiene into dicyclopentadiene, Then enter the pre-weight removal tower T-102, the pre-weight removal tower T-102 has 85 theoretical plates, the reflux ratio is 10, the temperature at the top of the tower is 50°C, and the material mainly composed of isoprene is extracted from the top of the tower. Extract the material based on piperylene and dicyclopentadiene from the bottom of the tower, and the overhead material and isopentane enter the azeotropic rectification tower 1. The azeotropic rectificati...

Embodiment 2

[0055] Using the cracked C5 fraction of Yanshan Petrochemical Company as raw material, the separation method of the present invention is used to separate the cracked C5 fraction. The composition of the raw material and the composition of the incoming and outgoing materials of each operating device are listed in Table 2 below.

[0056] (1) Pretreatment unit: 31,000kg / h of cracked C5 fraction enters the dimerization reactor R-101 for dimerization reaction at 80-85°C to dimerize cyclopentadiene into dicyclopentadiene, Then enter the pre-weight removal tower T-102, the pre-weight removal tower T-102 has 85 theoretical plates, the reflux ratio is 10, the temperature at the top of the tower is 50°C, and the material mainly composed of isoprene is extracted from the top of the tower. Extract the material based on piperylene and dicyclopentadiene from the bottom of the tower, and the overhead material and isopentane enter the azeotropic rectification tower 1. The azeotropic rectificati...

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Abstract

The invention discloses a method for separating isoprene by front-end hydrogenation one-section extraction, which belongs to the C5 fraction separation technical field. The invention aims to solve the problems that: during the prior C5 separation flow, a second extraction unit has high energy consumption, complicated operation and strict operation requirement, and large loss of extracting solvent and so on, and provides a method for separating isoprene fractions by one-section extraction rectification. The method removes cyclopentadiene by a rectification method and removes acetylene hydrocarbon by an azeotropic rectification method, can obtain a polymerization grade isoprene product without secondary extraction, and save the second extraction unit and a solvent refining column. The method has simple and easy operation, and reduces production cost. Under the same raw material treatment load, the heat energy consumption of a polymerization grade isoprene unit is about 20 percent of the prior second extraction unit, m-pentadien is extracted from a pre-deheavy fractionator without entering an extraction rectification unit, the treatment capacity of an extraction rectification column, an absorption tower and a de-heavy fractionator is reduced by 50 percent, and the energy consumption is correspondingly reduced by 50 percent, so the construction cost and the production cost are greatly reduced.

Description

technical field [0001] The present invention relates to a method for separating C5 fractions, more specifically, the present invention relates to a method for separating and cracking C5 fractions to prepare polymer grade isoprene products. Background technique [0002] In the process of producing ethylene from petroleum cracking, a considerable amount of C5 fraction is by-produced, and the C5 fraction is rich in diolefins such as isoprene, cyclopentadiene and piperylene. These diolefins are chemically active and are important chemical raw materials. Due to the difference in cracking raw materials, cracking depth and separation degree of petroleum hydrocarbons, the content of diolefins in cracked C5 fractions is different, and the total content 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 cr...

Claims

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Application Information

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IPC IPC(8): C07C11/18C07C7/177C07C7/08
Inventor 田保亮戴伟高继东冯海强鲁云
Owner CHINA PETROLEUM & CHEM CORP
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