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Method for preparing high-purity cyclopentadiene from dicyclopentadiene

A technology of dicyclopentadiene and cyclopentadiene, which is applied in the field of preparation of cyclopentadiene and cyclopentadiene by thermal cracking of dicyclopentadiene, can solve the problems of small temperature difference, coking, etc., and achieve improved distillation Efficiency, high yield, uniform heating effect

Active Publication Date: 2018-05-25
FUSHUN RES INST OF PETROLEUM & PETROCHEMICALS SINOPEC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention conducts thermal depolymerization by direct heating of dicyclopentadiene, and the temperature difference between the heating body and the material to be heated is controllable in this method, and the temperature difference is small; the heating temperature is more uniform, and there is no hot spot; coking problem

Method used

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  • Method for preparing high-purity cyclopentadiene from dicyclopentadiene
  • Method for preparing high-purity cyclopentadiene from dicyclopentadiene
  • Method for preparing high-purity cyclopentadiene from dicyclopentadiene

Examples

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Effect test

Embodiment 1

[0069] The rectification tower, operation method and raw materials used in the experiment are the same as those in Comparative Example 1. The difference is that a certain amount of refined naphtha-1 is added in advance to the feed heater 2 and the tower kettle 14. The main physical properties are shown in Table 3. The specific operating conditions and product analysis results of the tower are shown in Table 4.

[0070] From the comparison of the data of Comparative Example 1 and Example 1 in Table 4, it can be seen that the use of refined naphtha-1 as the heating carrier increases the purity of the product from 98.31% to 99.41%; the increase in product yield is more obvious, from 85.4 % Increased to 92.4%. It shows that using refined naphtha-1 as the heating carrier, the heating is more uniform, and there is no local overheating and hot spots.

[0071] In addition, using refined naphtha-1 as a heating carrier can also shorten the residence time of the material in the tower, from ...

Embodiment 2

[0073] The rectification tower, operation method and raw materials used in the experiment are the same as those in Comparative Example 1. The difference is that a certain amount of refined naphtha-2 is added to the feed heater 2 and the tower kettle 14, and the main physical properties are shown in Table 3. The specific operating conditions and product analysis results of the tower are shown in Table 4.

[0074] From the comparison of the data of Comparative Example 1 and Example 2 in Table 4, it can be seen that the purity of the product is increased from 98.31% to 99.32% due to the use of refined naphtha-2 as the heating carrier; the product yield has increased more significantly, from 85.4% Increased to 91.4%. It shows that the refined naphtha-2 is used as the heating carrier, and the heating is even, without local overheating and hot spots.

[0075] In addition, refined naphtha-2 as a heating carrier can also shorten the residence time of the material in the tower, from 3.0h ...

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Abstract

The invention discloses a method for preparing high-purity cyclopentadiene from dicyclopentadiene. Dicyclopentadiene and circulating distillate oil light components enter a heater to be heated, partially decomposed and fed into a feeding section; a decomposition product and vaporized distillate oil light components flow upwards, cyclopentadiene is extracted from the top of a rectifying column andcooled, a part of cyclopentadiene is taken as a product, and the other part of cyclopentadiene as reflux returns to the top of the column; the distillate oil light components are extracted from the lateral line of the rectifying section and circularly return to the heater; undecomposed dicyclopentadiene flows into a stripping section from top to bottom, is mixed and contacted with distillate oil gas-phase components evaporating from the column bottom and is heated and gradually decomposed into cyclopentadiene. According to the method, a heating medium and the heated materials are subjected todirect contact, mixing, mass transfer and heat transfer, the problem of coking due to non-uniform heating is solved, and the higher yield of the target product can be realized.

Description

Technical field [0001] The invention belongs to the field of chemical industry and relates to a method for preparing cyclopentadiene, in particular to a method for preparing cyclopentadiene from dicyclopentadiene through thermal cracking. Background technique [0002] Cyclopentadiene (CPD), also known as 1,3-cyclopentadiene, cyclopentadiene, is a colorless, transparent liquid with a strong pungent odor. Cyclopentadiene has a conjugated double bond and an active hydrogen atom on the methylene group, and can undergo various reactions. As an important chemical and fine chemical raw material, cyclopentadiene has a wide range of uses. It can be used in the production of pesticides, rubber, plastics, fragrances, medicines, flame retardants, unsaturated resins, etc., and also as a large proportion of aviation kerosene and fuel additives. . [0003] At present, most of the industrial production methods of cyclopentadiene use dicyclopentadiene (DCPD) thermal depolymerization method, usual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/22C07C7/04C07C13/15
CPCC07C4/22C07C7/04C07C13/15
Inventor 艾抚宾杨立国乔凯方向晨徐彤祁文博刘平
Owner FUSHUN RES INST OF PETROLEUM & PETROCHEMICALS SINOPEC CORP
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