Method for separating cyclopentadiene and methylcyclopentadiene from ethylene by-product C9

A technology of methylcyclopentadiene and cyclopentadiene, which is applied in the directions of distillation purification/separation, depolymerization to produce hydrocarbons, etc., can solve problems such as affecting normal production, pipeline blockage, increasing operating cost and labor intensity, etc. The effect of prolonging equipment production cycle, simplifying equipment, reducing production labor intensity and energy consumption

Inactive Publication Date: 2008-05-28
天津天大天海化工新技术有限公司 +1
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

However, since the high-temperature cracking reactor and the rectification tower are independent devices, the high-temperature material from the high-temperature cracking reactor is transported to the rectification tower through pipelines. Carbon deposits are generated, causing pipeline blockage. When the carbon deposit is serious, it will affect the normal production. It is necessary to stop the furnace regularly to clean the carbon deposits in the pipes and valves. This will increase the operating cost and labor intensity.

Method used

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  • Method for separating cyclopentadiene and methylcyclopentadiene from ethylene by-product C9

Examples

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Effect test

Embodiment 1

[0024]The ethylene by-product C9 containing 40% of dicyclopentadiene and dimethylcyclopentadiene is passed into the high-temperature cracking reactor in the 1st tank of the rectification tower. The cracking reaction temperature is 320°C. The mixed gas after the cracking reaction Pass into the rectification tower 1 filled with packing, the temperature at the bottom of the tower is 260°C, and the temperature at the top of the tower is 80°C. The fraction containing cyclopentadiene and methylcyclopentadiene is extracted at the top of the tower, containing cyclopentadiene, methylcyclopentadiene, and cyclopentadiene. The fraction of cyclopentadiene is passed into the rectifying tower 2 of packed packing, 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 top of the tower, and 95% of the cyclopentadiene is extracted from the bottom of the tower. Methylcyclopentadiene products. B...

Embodiment 2

[0026] The ethylene by-product C9 containing 25% of dicyclopentadiene and dimethylcyclopentadiene is passed into the high-temperature cracking reactor in the first tank of the rectification tower. The cracking reaction temperature is 380 ° C. The mixed gas after the cracking reaction Pass into the rectifying tower 1 equipped with trays, 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, containing cyclopentadiene, The fraction of methylcyclopentadiene is passed into the rectifying tower 2 equipped with trays, the temperature at the bottom of the tower is 100°C, the temperature at the top of the tower is 55°C, 95% of the cyclopentadiene product is extracted from the top of the tower, and 93% of the cyclopentadiene is extracted from the bottom of the tower. % of methylcyclopentadiene product. Both rectification column 1 an...

Embodiment 3

[0028] The crude cyclopentadiene containing 65% of dicyclopentadiene and dimethylcyclopentadiene is passed into the high-temperature cracking reactor in the 1st tank of the rectification tower, the cracking reaction temperature is 220°C, and the mixed steam after the cracking reaction The body is passed into the rectifying tower 1 equipped with trays, 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 1. The cut of methylcyclopentadiene passes into the rectifying tower 2 that tray is equipped with, and tower bottom temperature is 70 ℃, tower top temperature 35 ℃, and the cyclopentadiene product of tower top mining 98%, tower bottom mining 91% Methylcyclopentadiene product. Both rectification column 1 and rectification column 2 are operated under normal pressure.

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Abstract

The invention relates to a method of separating cyclopentadiene and methyl cyclopentadiene from a mixture with ingredients of dicyclopentadiene and dimethyl cyclopentadiene. The method is particularly suitable for purifying and separating the cyclopentadiene and methyl cyclopentadiene from ethylene byproduct C9 or crude cyclopentadiene. Ethylene byproduct C9 or crude dicyclopentadiene that contains dicyclopentadiene and dimethyl cyclopentadiene is put into a high-temperature cracking reactor that is arranged in a tower boiler of a rectifying tower 1; pyrolyzed mixture gas under high temperature runs upwards through the rectifying tower to lead distillate that contains the cyclopentadiene and the methyl cyclopentadiene to be separated at the top of the tower; the mixture distillate of the cyclopentadiene and methyl cyclopentadiene that is extracted at the top of the rectifying tower 1 enters a rectifying tower 2, and the cyclopentadiene is extracted from the top of the tower and the methyl cyclopentadiene is extracted from the bottom of the tower.

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): C07C13/15C07C4/22C07C7/04
Inventor 刘锋李崇张曾廉燕王芳李雪张大治张力擎
Owner 天津天大天海化工新技术有限公司
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