Method for producing high-purity cyclopentadiene and cyclopentane by coarse piperyene

A technology of crude piperylene and cyclopentane, applied in organic chemistry, isomerization hydrocarbon production, etc., can solve the problems that the separation of cyclopentene and piperylene cannot be realized, and achieve easy industrial production and high product quality The effect of stability and high purification precision

Active Publication Date: 2008-06-11
山东玉皇盛世化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since cyclopentene and piperylene have the same boiling point, conventional distillation methods cannot separate cyclopentene and piperylene.

Method used

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  • Method for producing high-purity cyclopentadiene and cyclopentane by coarse piperyene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The crude piperylene raw material enters the extraction tower in the presence of the polymerization inhibitor SP-731, and contacts with the extraction agent dimethylformamide added at the top of the tower. The operating pressure of the extraction tower is controlled to be: 0.14, the temperature is 52°C, and the reflux ratio is 2, The volume ratio of dimethylformamide to raw material is 4:1, the feed temperature is 70°C, and cyclopentene and cyclopentane mixture are obtained from the top of the tower, and the bottom of the tower is the extractant and piperylene. The extraction agent and piperylene from the tower bottom enter the desorption tower, the operating pressure is normal pressure, the temperature of the tower bottom is 160°C, the tower bottom liquid is returned to the extraction tower or the solvent removal recovery system, and high-purity refined piperylene is distilled from the top of the tower. Put the top material into the first rectification tower, the operat...

Embodiment 2

[0031] The crude piperylene raw material enters the extraction tower in the presence of the polymerization inhibitor SP-731, contacts with the extraction agent dimethylformamide added at the top of the tower, and controls the operating pressure of the extraction tower: 0.17Mpa, temperature 135°C, reflux ratio 9. The volume ratio of dimethylformamide to raw material is 10:1, the feed temperature is 95°C, and the mixture of cyclopentene and cyclopentane is obtained from the top of the tower, and the bottom of the tower is the extractant and piperylene. The extraction agent and piperylene from the tower bottom enter the desorption tower, the operating pressure is normal pressure, the temperature of the tower bottom is 100°C, the tower bottom liquid is returned to the extraction tower or the solvent removal recovery system, and high-purity refined piperylene is distilled from the top of the tower. Put the top material into the first rectification tower, the operating pressure is 0....

Embodiment 3

[0033] The crude piperylene raw material enters the extraction tower in the presence of the polymerization inhibitor SP-731, and contacts with the extraction agent dimethylformamide added at the top of the tower. The operating pressure of the extraction tower is controlled to be: 0.16Mpa, the temperature is 85°C, and the reflux ratio is 6 , the volume ratio of dimethylformamide to raw material is 7:1, the feed temperature is 80°C, cyclopentene and cyclopentane mixture are obtained from the top of the tower, and the bottom of the tower is the extractant and piperylene. The extraction agent and piperylene from the tower bottom enter the desorption tower, the operating pressure is normal pressure, the temperature of the tower bottom is 80°C, the tower bottom liquid is returned to the extraction tower or the solvent removal recovery system, and high-purity refined piperylene is distilled from the top of the tower. Put the top material into the first rectification tower, the operati...

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Abstract

The invention discloses a method for preparing cyclopentene and cyclopentene of high purity by using coarse pentadiene got from petroleum cracking ethylene by-product carbon five separation. Feeding the coarse pentadiene into extraction tower in existence of polymerization inhibitor, getting mixing material of cyclopentene and cyclopentane in the tower top, extracting agent and pentadiene being in the tower still; feeding the material got in tower top to the first fractionating tower, stipping light component in tower top, getting mixing material of cyclopentene and cyclopentane in the tower still; feeding the material got from the first fractionating tower still into the second fractionating tower, getting cyclopentene of above 99% in tower top, and cyclopentane in tower still; feeding the material got from the second fractionating tower still into the third fractionating tower, steeping the heavy component in the tower still and getting the cyclopentane product in tower top. The invention employs extractive distillation method and is characterized by the high extraction accuracy, stable product quality and easy for industrial production.

Description

(1) Technical field [0001] The invention relates to a method for producing high-purity cyclopentene and cyclopentane, in particular to a method for producing high-purity cyclopentene and cyclopentane from crude piperylene obtained by separating carbon five, a by-product of petroleum cracking to ethylene . (2) Background technology [0002] In the process of producing ethylene from petroleum cracking, C5 by-products account for 12%-14%. In 2005, my country's ethylene processing capacity reached 7.5 million tons, producing more than 1 million tons of C5 by-products. Since the C5 fraction contains diolefins such as isoprene, cyclopentadiene, and piperylene, these diolefins are chemically active and are very important chemical raw materials. The development and utilization of these three diolefins at home and abroad is earlier, especially isoprene and cyclopentadiene (dicyclopentadiene) are widely used, because the purity of piperylene is usually about 65%, and contains 15% -1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/22C07C13/10C07C13/12
Inventor 王金书王宝刚张金平崔树峰
Owner 山东玉皇盛世化工股份有限公司
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