Method for preparing cyclopentane by utilizing dicyclopentadiene

A technology of dicyclopentadiene and cyclopentane, which is applied in the field of fine chemical preparation, can solve the problems of high preparation cost of cyclopentane, rising temperature, easy damage to catalysts, etc. The effect of reducing production costs and reducing input costs

Pending Publication Date: 2018-01-19
濮阳市联众兴业化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation method of cyclopentane is mainly based on separation, because the separation method is generally subject to the price of raw materials, resulting in the high cost of preparation of cyclopentane
On the other hand, dicyclopentadiene is depolymerized to cyclopentadiene, and cyclopentadiene is directly hydrogenated to obtain cyclopentene. Since the polymerization of cyclopentene is serious and the temperature rise is extremely high during hydrogenation, it is very easy to damage the catalyst. , this method cannot achieve mass production, and the current depolymerization and hydrogenation of dicyclopentadiene to cyclopentane does not have the significance of promotion

Method used

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  • Method for preparing cyclopentane by utilizing dicyclopentadiene

Examples

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Embodiment 1

[0019] In Example 1 of the present invention: a method for preparing cyclopentane by utilizing dicyclopentadiene, the process steps are as follows:

[0020] 1) Depolymerization and rectification stage: Dicyclopentadiene and saturated oil (non-cyclopentane) are mixed at a mass fraction ratio of 35:65 to obtain a mixed material, and the mixed material is introduced into a reactive distillation tower for rectification separation, The temperature of the tower kettle is 165-170°C, the operating pressure of the reactive distillation is 0.08MPa, and the plate number of the reactive distillation column is ≥35; The temperature of the material is ≤40°C; the selected bubble point temperature of the diluted oil is 45-80°C; the mass fraction content of cyclopentadiene in the top material of the reactive distillation tower is ≤35%;

[0021] 2) Hydrogenation stage: the top material of the reactive distillation tower in step 1) is introduced into the hydrogenation reactor through a cold feedi...

Embodiment 2

[0023] In Example 2 of the present invention: a method for preparing cyclopentane by dicyclopentadiene, the process steps are as follows:

[0024] 1) Depolymerization and rectification stage: Dicyclopentadiene and unsaturated oil are mixed at a mass fraction ratio of 35:65 to obtain a mixed material, and the mixed material is introduced into a reactive distillation tower for rectification separation, and the temperature of the tower is 165 ~170℃, the operating pressure of reactive distillation is 0.08MPa, the plate number of reactive distillation column is ≥35; the residence time of the top material in the top reflux tank of the reactive distillation column is ≤1h, and the temperature of the material in the top reflux tank is ≤40℃ The bubble point temperature of the diluted oil product is 45-80°C; the mass fraction content of cyclopentadiene in the overhead material of the reactive distillation tower is ≤35%;

[0025] 2) Hydrogenation stage: the top material of the reactive di...

Embodiment 3

[0027] In the embodiment of the present invention 3: a kind of method utilizing dicyclopentadiene to prepare cyclopentane, process steps are as follows:

[0028] 1) Depolymerization and rectification stage: Dicyclopentadiene and pure cyclopentane are mixed at a mass fraction ratio of 35:65 to obtain a mixed material, and the mixed material is introduced into a reactive distillation tower for rectification separation, and the temperature of the tower bottom is 165~170℃, the operating pressure of reactive distillation is 0.08MPa, the plate number of reactive distillation column is ≥35; the residence time of the top material in the top reflux tank of the reactive distillation column is ≤1h, and the temperature of the material in the top reflux tank is ≤40 °C; the selected bubble point temperature of the diluted oil product is 45-80 °C; the cyclopentadiene mass fraction content in the overhead material of the reactive distillation tower is ≤35%;

[0029] 2) Hydrogenation stage: th...

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Abstract

The invention discloses a method for preparing cyclopentane by utilizing dicyclopentadiene. The method comprises the following steps: 1) depolymerizing distilling stage: acquiring a mixture by mixingdicyclopentadiene and diluted oil product at mass ratio of 35:65 and then guiding the mixture into a reaction distillation tower, wherein the tower kettle temperature is 165-170 DEG C; 2) hydrogenation stage: guiding the material at the top of the reaction distillation tower into a hydrogenation reactor in the manner of cold feeding, wherein the temperature of the first hydrogenation inlet is 45 DEG C and the temperature of the second hydrogenation port is 220 DEG C; and 3) separation stage: guiding the hydrogeneration material acquired in the step 2) into a separation system for separating, thereby acquiring the cyclopentane product. According to the invention, the depolymerization rate of dicyclopentadiene is greatly increased, and meanwhile, the material temperature is effectively prevented from rapidly rising in the hydrogeneration process, the catalyst loss is reduced, the production cost is lowered and higher yield of the dicyclopentadiene product is guaranteed.

Description

technical field [0001] The invention relates to the technical field of preparation of fine chemicals, in particular to a method for preparing cyclopentane by utilizing dicyclopentadiene. Background technique [0002] Cyclopentane, as a new type of blowing agent for refrigerator insulation materials and rigid polyurethane foam, is used to replace chlorofluorocarbons (CFCS), which have a damaging effect on the atmospheric ozone layer. It has been widely used in the production of fluorine-free refrigerators, freezers, cold storage, Pipeline insulation and other fields. my country has signed the Montreal Convention on the protection of the atmospheric ozone layer. As the implementation period of the Convention is approaching, most domestic refrigerator factories, polyurethane factories and research institutions are looking for suitable substitutes for Freon. [0003] At present, the preparation method of cyclopentane is mainly based on separation, and because the separation met...

Claims

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Application Information

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IPC IPC(8): C07C13/10C07C5/03C07C7/04C07C4/22C07C7/05C07C13/15
CPCY02P20/10
Inventor张怀敏魏冕武建庆卢世杉张文魁鲁少飞
Owner濮阳市联众兴业化工有限公司