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Process of separating cyclopentadiene and methyl cydopentadiene from ethylene side C9 product

A technology for methylcyclopentadiene and bismethylcyclopentadiene, which is applied in the field of separating cyclopentadiene and methylcyclopentadiene, can solve the difficulty in handling catalysts and cannot simultaneously separate high-purity methylcyclopentadiene Diene, loss of active components, etc.

Active Publication Date: 2007-11-07
天津天大天海化工新技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the distillation dry point of ethylene by-product C9 is relatively low, generally no more than 250°C, and in many cases, the dry point is only about 200°C, so the method of reactive distillation is difficult to operate at high temperature, so there are long residence time of raw materials and activity in raw materials. The disadvantage of loss of components
In order to shorten the residence time of raw materials, the reactive distillation method can add cracking catalysts, but the use of catalysts brings difficulties in handling catalysts
[0010] The above methods all have the disadvantage of not being able to separate high-purity methylcyclopentadiene simultaneously.

Method used

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  • Process of separating cyclopentadiene and methyl cydopentadiene from ethylene side C9 product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The ethylene by-product C9 containing 40% of dicyclopentadiene and dimethylcyclopentadiene is passed into the high-temperature cracking reactor, the cracking reaction temperature is 320°C, and the mixed gas after the cracking reaction is passed into the rectification packed with packing Tower 1, the temperature at the bottom of the tower is 260°C, and the temperature at the top of the tower is 80°C. The cuts containing cyclopentadiene and methylcyclopentadiene are extracted at the top of the tower, and the cuts containing cyclopentadiene and methylcyclopentadiene are passed through Enter the rectifying tower 2 filled with fillers, the temperature at the bottom of the tower is 90°C, the temperature at the top of the tower is 45°C, 97% of the cyclopentadiene product is extracted from the tower top, and 95% of the methylcyclopentadiene product is extracted from the bottom of the tower. Both rectification column 1 and rectification column 2 are operated under normal pressure...

Embodiment 2

[0030] The ethylene by-product C9 containing 25% of dicyclopentadiene and dimethylcyclopentadiene is passed into the high-temperature cracking reactor, and the cracking reaction temperature is 380 ° C. The mixed gas after the cracking reaction is passed into the refined Distillation tower 1, the temperature at the bottom of the tower is 280°C, the temperature at the top of the tower is 90°C, and the fraction containing cyclopentadiene and methylcyclopentadiene is extracted at the top of the tower, and the fraction containing cyclopentadiene and methylcyclopentadiene Pass into the rectifying tower 2 that tray is equipped with, tower bottom temperature 100 ℃, tower top temperature 55 ℃, the cyclopentadiene product of tower top extraction 93%, the methyl cyclopentadiene of tower bottom extraction 93% product. Both rectification column 1 and rectification column 2 are operated under normal pressure.

Embodiment 3

[0032]Crude cyclopentadiene containing 65% of dicyclopentadiene and dimethylcyclopentadiene is passed into a high-temperature cracking reactor, the cracking reaction temperature is 280°C, and the mixed gas after the cracking reaction is passed into a tray equipped with Rectification tower 1, the temperature at the bottom of the tower is 160°C, and the temperature at the top of the tower is 35°C. The fraction containing cyclopentadiene and methylcyclopentadiene is extracted at the top of the tower, and the fraction containing cyclopentadiene and methylcyclopentadiene is extracted. The fraction is passed into the rectifying tower 2 equipped with trays, the temperature at the bottom of the tower is 70°C, the temperature at the top of the tower is 35°C, 98% of the cyclopentadiene product is produced at the top of the tower, and 91% of the methylcyclopentadiene is produced at the bottom of the tower olefin products. Both rectification column 1 and rectification column 2 are operate...

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Abstract

The present invention is process of separating cyclopentadiene and methyl cyclopentadiene from mixture containing dicyclopentadiene and dimethyl cyclopentadiene, and is especially suitable for separating and purifying cyclopentadiene and methyl cyclopentadiene from ethylene side C9 product or coarse cyclopentadiene product. The material, ethylene side C9 product or coarse cyclopentadiene product, is introduced into a high temperature cracking reactor, the high temperature cracked gas mixture is led to the first fractionating tower to separate out the fraction containing cyclopentadiene and methyl cyclopentadiene in the tower top, and the tower top fraction of the first fractionating tower is fed to the second fractionating tower to separate out cyclopentadiene in the tower top and methyl cyclopentadiene in the tower bottom.

Description

technical field [0001] The invention relates to a method for separating cyclopentadiene and methylcyclopentadiene from a mixture containing dicyclopentadiene and dimethylcyclopentadiene components, and is particularly suitable for producing C9 or crude cyclopentadiene from ethylene by-products Separation and purification of cyclopentadiene and methylcyclopentadiene from pentadiene. Background technique [0002] Both cyclopentadiene and methylcyclopentadiene are important chemical raw materials. Usually, there are three ways to prepare cyclopentadiene: one is to recover from coal coking benzene fraction, the other is to separate from petroleum ethylene by-product C5 fraction, and the third is to obtain a few by synthetic methods. Now the industrial production of cyclopentadiene mainly adopts the first two methods. However, the raw materials processed by these two production methods are all complex mixtures, and cyclopentadiene products with relatively high purity can only b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C13/15C07C4/22C07C7/09
Inventor 刘锋李崇张曾廉燕王芳李雪张大治张力擎张冀鲁孔德忠刘佳彦
Owner 天津天大天海化工新技术有限公司
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