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Production method of naphthalene-free cyclopentane

A production method and technology for naphthalenecyclopentane are applied in the field of cyclopentane denaphthalene treatment, can solve problems such as naphthalene poisoning, and achieve the effects of avoiding naphthalene poisoning, safe production and operation, and avoiding pollution

Inactive Publication Date: 2018-01-12
濮阳市联众兴业化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And because cyclopentane is generally used in people's daily life and household, when cyclopentane contains a lot of naphthalene, it will be in the human living environment for a long time, and it is easy to cause naphthalene poisoning. Therefore, the naphthalene content in the finished cyclopentane is required to be ≤10μg / g , therefore, how to realize cyclopentane without naphthalene and improve the quality of cyclopentane is very important

Method used

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  • Production method of naphthalene-free cyclopentane

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Embodiment 1

[0016] In the embodiment of the present invention 1: a kind of production method without naphthalene cyclopentane, process step is as follows:

[0017] 1) Mixing stage: import cracked carbon five and finished cyclopentane with a mass fraction ratio of 7:3 into the stirred tank, and carry out pressurized stirring. Mix evenly to form a mixed material;

[0018] 2) Hydrogenation stage: the mixed material obtained in step 1) is preheated by a preheater, introduced into a hydrogenation reactor for one-inversion and two-inversion hydrogenation, and the hydrogenation material is exported, filtered, and impurities are removed to obtain a hydrogenation product; The hydrogenation-reverse inlet temperature is 44.5°C, the temperature rise is 60°C, the amount of circulating material is 5 times that of the feed amount, the pressure is 2.2MPa, the hydrogen-oil ratio is 8, and the catalyst is a nickel catalyst. In terms of weight ratio, the nickel catalyst The amount used is nickel catalyst: ...

Embodiment 2

[0020] In the embodiment of the present invention 2: a kind of production method without naphthalene cyclopentane, process step is as follows:

[0021] 1) Mixing stage: import cracked carbon five and finished cyclopentane with a mass fraction ratio of 7:3 into the stirred tank, and carry out pressurized stirring. Mix evenly to form a mixed material;

[0022] 2) Hydrogenation stage: the mixed material obtained in step 1) is preheated by a preheater, introduced into a hydrogenation reactor for one-inversion and two-inversion hydrogenation, and the hydrogenation material is exported, filtered, and impurities are removed to obtain a hydrogenation product; The hydrogenation-reverse inlet temperature is 45°C, the temperature rise is 65°C, the amount of circulating material is 5 times that of the feed amount, the pressure is 2.2MPa, the hydrogen-oil ratio is 8, and the catalyst is a nickel catalyst. In terms of weight ratio, the nickel catalyst The amount used is nickel catalyst: mi...

Embodiment 3

[0024] In the embodiment of the present invention 3: a kind of production method without naphthalene cyclopentane, process step is as follows:

[0025] 1) Mixing stage: import cracked carbon five and finished cyclopentane with a mass fraction ratio of 7:3 into the stirred tank, and carry out pressurized stirring. Mix evenly to form a mixed material;

[0026] 2) Hydrogenation stage: the mixed material obtained in step 1) is preheated by a preheater, introduced into a hydrogenation reactor for one-inversion and two-inversion hydrogenation, and the hydrogenation material is exported, filtered, and impurities are removed to obtain a hydrogenation product; The hydrogenation-reverse inlet temperature is 45.5°C, the temperature rise is 70°C, the amount of circulating material is 5 times that of the feed amount, the pressure is 2.2MPa, the hydrogen-oil ratio is 8, and the catalyst is a nickel catalyst. In terms of weight ratio, the nickel catalyst The amount used is nickel catalyst: ...

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Abstract

The invention discloses a production method of naphthalene-free cyclopentane. The production method includes: evenly mixing cracking C5 and finished cyclopentane which are in the proportion of 7:3 toform a mixed material and hydrogenating the mixed material through first-stage and second-stage reactors to obtain tetrahydronaphthalene hydrogenation products; sequentially leading the tetrahydronaphthalene hydrogenation products to a lightness removal tower and a de-heavy tower for separation to obtain the naphthalene-free cyclopentane. The production method is safe in operation and good in naphthalene removal effect, and naphthalene poisoning in household life is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of cyclopentane removal of naphthalene, in particular to a method for producing naphthalene-free cyclopentane. 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, and cold storage, Pipeline insulation and other fields. [0003] In the prior art, cyclopentane can only be prepared by separation due to the problem of the preparation process. Since naphthalene is easy to sublimate, the finished cyclopentane will contain a certain amount of naphthalene (100-500 μg / g). And because cyclopentane is generally used in people's daily life and household, when cyclopentane contains a lot of naphthalene, it will be in the human living environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C13/10C07C7/163C07C7/04
Inventor 卢世杉魏冕闫建波张文生杨晶宇毛环瑞
Owner 濮阳市联众兴业化工有限公司
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