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A kind of production method of ethylidene norbornene

A technology for the production of ethylidene norbornene, which is applied in the direction of isomerization and hydrocarbon production, can solve the problems of high production cost and low yield of target products, and achieve the effect of increased selectivity and simple reaction process

Active Publication Date: 2017-12-19
SHANGHAI PEARLK CHEM
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] To sum up, the current production process of ENB is relatively complicated, and it needs to be produced through diene synthesis and isomerization reaction, and the yield of the target product is low, and the production cost is extremely high

Method used

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  • A kind of production method of ethylidene norbornene
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  • A kind of production method of ethylidene norbornene

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Embodiment 1～6

[0024] The reaction is carried out in a tank reactor with a volume capacity of 2 liters. The reactor is equipped with a stirring device, a cooling coil, and an electric heating system is installed outside. Pump the prepared solution of dicyclopentadiene (DCPD), acetone, 1,2-butadiene (BD) and p-tert-butylcatechol (TBC) into the reactor, start stirring, and raise the temperature to the required temperature , and then use the constant pressure valve to adjust the pressure of the reactor to the set pressure to carry out the reaction. After the reaction is finished, it is collected after cooling, sampled and analyzed, and the analysis of the sample adopts the GC method. The collected reaction materials are transferred into a rectification tower with 45 theoretical plates for rectification. The content of the obtained ethylidene norbornene (ENB) product is 99.9%, and the recovered acetone is recycled.

[0025] See Table 1 for the specific reaction conditions of each example, the c...

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Abstract

A kind of production method of ethylidene norbornene, this method adopts tank reactor, makes dicyclopentadiene (DCPD) cracking becomes cyclopentadiene (CPD), cyclopentadiene (CPD) and 1,2-butane The diene (BD) is converted into ethylidene norbornene (ENB) by a Diels-Alder reaction, and the reaction product is separated by rectification to obtain an ethylidene norbornene product with a content of more than 99.5%. The reaction uses acetone as a solvent, the molar ratio of BD to DCPD is 0.2-1.5:1, the weight ratio of solvent acetone to DCPD is 0.5-2.0:1, and the amount of polymerization inhibitor p-tert-butylcatechol (TBC) is the mass of DCPD 0.003%, the reaction temperature is 170-190°C, the system pressure is 7-11MPa, and the reaction time is 2-8 hours. Compared with the prior art, the reaction process is simple, and the conversion rate of the reaction and the selectivity of ethylidene norbornene are obviously improved.

Description

technical field [0001] The invention relates to a method for preparing ethylidene norbornene (ENB) with dicyclopentadiene (DCPD) and 1,2-butadiene (BD) as raw materials, in particular to acetone as a solvent in a tank reactor Inside, dicyclopentadiene (DCPD) is depolymerized into cyclopentadiene (CPD), and cyclopentadiene (CPD) undergoes a Diels-Alder reaction with 1,2-butadiene (BD) to convert ethylidene norbornene (ENB) method. Background technique [0002] Ethylidene norbornene (ENB) is a colorless transparent liquid at room temperature, has a strong camphor-like odor, and is relatively volatile in the air. The odor can be smelled when the concentration in the air is 0.014ppm. At present, ENB is mainly used in ethylene propylene diene monomer (EPDM), which has high polymerization activity; there are few secondary reaction opportunities for branching rubber molecules and forming gel; the vulcanization speed of the product is fast, and it is the first choice for the third ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C13/43C07C5/25
Inventor 石康明
Owner SHANGHAI PEARLK CHEM
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