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Method for directly separating and purifying cyclopentene from C5 raw material adopting extraction and distillation technology

An extractive distillation and extractive distillation tower technology, which is applied in the field of extractive distillation technology for separating high-purity cyclopentene, can solve the problems of high operation risk and complicated production process, and achieves the advantages of high operation risk and reduced production cost. Effect

Active Publication Date: 2009-09-30
SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, cyclopentene is mainly produced by thermal cracking of dicyclopentadiene to cyclopentadiene and then hydrogenated. The production process is complicated and the operation is very dangerous.

Method used

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  • Method for directly separating and purifying cyclopentene from C5 raw material adopting extraction and distillation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The thermally polymerized C5 raw material enters the first rectification tower in the presence of the polymerization inhibitor tributyl citrate (TBC), and the pressure at the top of the tower is controlled to 0.2Mpa, the reflux ratio is 4, and the temperature is 45°C. Isoprene and low boiling point components are obtained from the top of the rectification tower, and components such as cyclopentene and dicyclopentadiene are obtained from the bottom of the tower. The components in the bottom of the column are sent to the second rectification column, and the pressure at the top of the rectification column is controlled to 0.1 MPa, the reflux ratio is 3, and the temperature is 60°C. Crude cyclopentene is obtained at the top of the tower, and dicyclopentadiene with a purity higher than 99% is obtained at the bottom of the tower. The top component is sent to the extractive distillation column to make it fully contact with the acetonitrile added at the top of the column, the p...

Embodiment 2

[0021] The thermally polymerized C5 raw material enters the first rectification tower in the presence of the polymerization inhibitor TBC, and the pressure at the top of the tower is controlled to 0.25MPa, the reflux ratio is 4, and the temperature is 49°C. Isoprene and low boiling point components are obtained from the top of the tower, and components such as cyclopentene and dicyclopentadiene are obtained from the bottom of the tower. The components in the bottom of the column are sent to the second rectification column, the pressure at the top of the column is controlled to 0.2MPa, the reflux ratio is 3, and the temperature is 68°C. Crude cyclopentene is obtained at the top of the tower, and dicyclopentadiene with a purity higher than 99% is obtained at the bottom of the tower. The top component is sent to the extractive distillation column to make it fully contact with the acetonitrile added at the top of the column, the top pressure of the tower is controlled to 0.35MPa, ...

Embodiment 3

[0024] The thermally polymerized C5 raw material enters the first rectification tower in the presence of the polymerization inhibitor TBC, the pressure at the top of the tower is controlled at 0.4 MPa, the reflux ratio is 3.5, and the temperature is 55°C. Isoprene and low boiling point components are obtained from the top of the tower, and components such as cyclopentene and dicyclopentadiene are obtained from the bottom of the tower. The components in the bottom of the column are sent to the second rectification column, the pressure at the top of the column is controlled to 0.3MPa, the reflux ratio is 4, and the temperature is 72°C. Crude cyclopentene is obtained at the top of the tower, and dicyclopentadiene with a purity higher than 99% is obtained at the bottom of the tower. The top component is sent to the extractive distillation tower to make it fully contact with the acetonitrile added at the top of the tower, and the pressure at the top of the tower is controlled to 0....

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Abstract

The invention discloses a method for directly separating and purifying cyclopentene from C5 raw materials adopting the extraction and distillation technology. Under the existence of an inhibitor of tributyl citrate, the C5 raw materials after heat polymerization is distilled through a distillation tower, extracted through an extraction tower and washed through a water scrubber to obtain a cyclopentene product. Through the extraction and distillation technology, and on the basis of not influencing the yield and the purity of isoprene, cyclopentadiene and pentadiene, the invention directly carries out separation and purification on the C5 raw materials to obtain the cyclopentene product with high purity of above 99 percent, and enhances the added value of the comprehensive utilization of C5 resources. The invention has the advantages of simple technological process, mild operation condition and low production cost, and can replace the technology of cyclopentadiene hydrogenation preparing cyclopentene which is widely adopted at present.

Description

technical field [0001] The invention belongs to the field of petrochemical technology, and relates to a method for separating cyclopentene from ethylene cracking by-product carbon five raw materials, in particular to a method for separating high-purity cyclopentene from ethylene cracking by-product carbon five raw materials through extraction and rectification technology ene method. Background technique [0002] In the process of producing ethylene from petroleum cracking, about 15% of the C5 mixture will be produced by-product, and the isoprene, cyclopentadiene, piperylene and other diolefins in the C5 mixture account for about 50% of the total content. In addition, It also contains a considerable amount of alkanes and monoolefins. Among them, the separation of isoprene and cyclopentadiene has formed a mature technology and is used in industrial production, but there is no relevant report on the utilization of monoolefins with higher added value. [0003] Cyclopentene is ...

Claims

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Application Information

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IPC IPC(8): C07C13/12C07C7/08C07C7/20
Inventor 邵鹏程曲云赵琳张耀亨徐斌潘广勤齐永新张霖肖瑞王琪许春建娄立娟
Owner SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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