Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for separating cracked carbon-5 fraction by front-end alkyne removal one-stage extraction

A technology for cracking carbon and removing alkynes, which can be used in the purification/separation of hydrocarbons, chemical instruments and methods, distillation purification/separation, etc. It can solve the problems of large solvent loss, difficult operation, and high energy consumption, and achieve easy operation and operation. The effect of simplicity and reduced construction costs

Active Publication Date: 2010-05-26
CHINA PETROLEUM & CHEM CORP +1
View PDF3 Cites 0 Cited by
  • Summary
  • 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, separation and cracking of C5 fractions of pre-de-alkynes. Removal of cyclopentadiene by distillation and removal of alkynes by azeotropic distillation to obtain polymer-grade isoprene without the need for a second extraction unit

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for separating cracked carbon-5 fraction by front-end alkyne removal one-stage extraction
  • Method for separating cracked carbon-5 fraction by front-end alkyne removal one-stage extraction
  • Method for separating cracked carbon-5 fraction by front-end alkyne removal one-stage extraction

Examples

Experimental program
Comparison scheme
Effect test

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 carbon five fractions and 1,500kg / h of carbon five alkanes mainly containing n-pentane and isopentane enter the middle part of azeotropic rectification tower 1, and azeotropic rectification tower 1 has 80 theoretical plates, the reflux ratio is 22, and the temperature at the top of the tower is 45°C. The light components containing C4, alkynes and alkanes are removed from the top of the tower, and the materials extracted from the bottom of the tower enter the dimerization reactor R-101. The dimerization reaction is carried out at 80-85°C to dimerize the cyclopentadiene into dicyclopentadiene, and then e...

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 cracked C5 cut and 1,500kg / h isopentane enter the middle part of azeotropic rectification tower 1, and azeotropic rectification tower 1 has 80 theoretical plates, and the reflux ratio is 22, The temperature at the top of the tower is 45°C. The light components containing C4, alkynes and alkanes are removed from the top of the tower, and the materials extracted from the tower reactor enter the dimerization reactor R-101, and carry out the dimerization reaction at 80-85°C , to dimerize the cyclopentadiene into dicyclopentadiene, and then enter the pre-weight removal tower T-102. The pre-weight removal tower T-102 ha...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
boiling pointaaaaaaaaaa
boiling pointaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for extracting, separating and cracking C5 fraction by the previous de-acetylene hydrocarbon section, belonging to the C5 fraction separating technical field. The method is put forward to solve the problems of the second extracting unit in the prior C5 fraction separation flow of high energy consumption, complicated operation, harsh requirement of the operation andgreat loss of the extracting solvent. The method adopts the rectification method to remove the cyclopentadiene and adopts the azeotropy rectification method to remove acetylene hydrocarbon as well asobtains the poly-isoprene product without the secondary extraction, thereby saving the second extracting unit and the solvent rectification tower. The method has simple operation, easy operation and low production cost. Under the same raw material processing load, the heat quantity of the poly-isoprene unit is only 20 percent of the prior secondary extracting unit, m-pentadiene is collected from apre-de-heavy tower bottom and does not enter the extracting rectification unit; the processing amount of the extracting rectification tower, an absorption tower and a de-heavy tower is reduced by 50percent; correspondingly, the energy consumption is reduced by 50 percent, both the construction cost and the production cost are lowered greatly.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/173C07C7/177C07C7/08
Inventor 田保亮戴伟高继东冯海强鲁云杨志钢
Owner CHINA PETROLEUM & CHEM CORP