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Method for preparing cyclopentene and cyclopentane by depolymerizing and hydrogenating dicyclopentadiene

A technology of dicyclopentadiene and cyclopentene, which is applied in the direction of cracking hydrocarbons in molecules, can solve the problems of uncontrollable composition and unadjustable ratio of cyclopentene and cyclopentane, and achieve the effect of improving conversion utilization

Inactive Publication Date: 2014-11-19
ZHEJIANG ALPHARM CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention solves the problems that the composition of cyclopentene and cyclopentane obtained by the catalytic hydrogenation reaction of cyclopentadiene cannot be controlled, and the ratio of the two cannot be adjusted.

Method used

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Examples

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Effect test

Embodiment 1

[0016] A kind of method that dicyclopentadiene depolymerization hydrogenation prepares cyclopentene and cyclopentane, described preparation method comprises the steps:

[0017] 1) Depolymerization reaction: Add the heat transfer oil to the heat conduction layer of the thermal decomposer and the reboiler, then raise the temperature to 260-300°C, and then continuously add the mixture of 3500kg dicyclopentadiene and heat transfer oil to the In the thermal decomposer, after staying for 5 hours under the reflux ratio of 5:1, dicyclopentadiene is heated and vaporized in the thermal decomposer, depolymerized into cyclopentadiene and enters the rectification column, and the top of the rectification column distills high Pure cyclopentadiene, a small amount of undepolymerized dicyclopentadiene and by-products are heated by the reboiler at the bottom of the tower and then rectified again; unreacted dicyclopentadiene and new dicyclopentadiene are used as depolymerization The raw materials...

Embodiment 2

[0020] A kind of method that dicyclopentadiene depolymerization hydrogenation prepares cyclopentene and cyclopentane, described preparation method comprises the steps:

[0021] 1) Depolymerization reaction: Add the heat transfer oil to the heat conduction layer of the thermal decomposer and the reboiler, then raise the temperature to 260-300°C, and then continuously add the mixture of 3500kg dicyclopentadiene and heat transfer oil to the In the thermal decomposer, after staying for 4 hours under the reflux ratio of 4:1, dicyclopentadiene is heated and vaporized in the thermal decomposer, depolymerized into cyclopentadiene and enters the rectification column, and the top of the rectification column distills high Pure cyclopentadiene, a small amount of undepolymerized dicyclopentadiene and by-products are heated by the reboiler at the bottom of the tower and then rectified again; unreacted dicyclopentadiene and new dicyclopentadiene are used as depolymerization The raw materials...

Embodiment 3

[0024] A kind of method that dicyclopentadiene depolymerization hydrogenation prepares cyclopentene and cyclopentane, described preparation method comprises the steps:

[0025] 1) Depolymerization reaction: Add the heat transfer oil to the heat conduction layer of the thermal decomposer and the reboiler, then raise the temperature to 260-300°C, and then continuously add the mixture of 3500kg dicyclopentadiene and heat transfer oil to the In the thermal decomposer, after staying for 3 hours under the reflux ratio of 4:1, dicyclopentadiene is heated and vaporized in the thermal decomposer, depolymerized into cyclopentadiene and then enters the rectification column, and the top of the rectification column distills high Pure cyclopentadiene, a small amount of undepolymerized dicyclopentadiene and by-products are heated by the reboiler at the bottom of the tower and then rectified again; unreacted dicyclopentadiene and new dicyclopentadiene are used as depolymerization The raw mate...

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Abstract

The invention discloses a method for preparing cyclopentene and cyclopentane by depolymerizing and hydrogenating dicyclopentadiene, which comprises the following steps: 1) depolymerization reaction: adding heat-conducting oil into a heat-conducting layer of a thermal decomposer and a reboiler, heating to 260-300 DEG C, and adding a dicyclopentadiene / heat-conducting oil mixture into the thermal decomposer, wherein the dicyclopentadiene is heated and vaporized in the thermal decomposer and depolymerized into cyclopentadiene, and the cyclopentadiene enters a rectifying column; and 2) hydrogenation reaction: carrying out catalytic hydrogenation reaction twice respectively in a primary hydrogenation kettle and a secondary hydrogenation kettle, wherein Raney nickel is used as a reaction catalyst. In the preparation method, the twice hydrogenation process is adopted, and the time, pressure and temperature of each hydrogenation reaction are controlled to control and adjust the cyclopentene / cyclopentane proportion in the product.

Description

technical field [0001] The invention relates to a method for preparing cyclopentene and cyclopentane through depolymerization and hydrogenation of dicyclopentadiene, which belongs to the field of chemical production. Background technique [0002] In the process of producing ethylene from petroleum cracking, the by-product carbon five accounts for 12% to 14%. In 2005, my country's ethylene processing capacity reached 750 tons, producing more than 1 million tons of carbon five 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, especially isoprene and cyclopentadiene. The application is very extensive. Cyclopentadiene is easily dimerized into dicyclopentadiene, and dicyclopentadiene can be depolymerized into cyclopentadiene at high temperature. Cyclopentadiene and dicyclopentadiene are mainly used in the production of petroleum resin, modi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C13/12C07C13/10C07C4/08
Inventor 翁高翔沈纪达张俊
Owner ZHEJIANG ALPHARM CHEM TECH
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