Vinyl norbornene production method

A technique for producing vinyl norbornene and a production method, which is applied in the field of Diels-Alder reaction of 3-butadiene, can solve the problems of low conversion rate, poor selectivity of target products, harsh reaction conditions, etc., and achieves improved yield, multiple The effect of avoiding the formation of polymers and polymers and improving selectivity

Active Publication Date: 2016-05-04
SHANGHAI PEARLK CHEM
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Problems solved by technology

[0006] In the prior art, the diene synthesis reaction conditions of CPD and BD are still relatively harsh, the conversion rate of the reaction is low, and the selectivity of the target product is poor

Method used

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  • Vinyl norbornene production method
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  • Vinyl norbornene production method

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Embodiment 1～6

[0031]The reaction was carried out in two tank reactors connected in series with a volume capacity of 2 liters and 1 liter respectively. The reactor was equipped with a stirring device, a cooling coil, and an electric heating system was installed outside. Pump the prepared dicyclopentadiene (DCPD), 1,3-butadiene (BD), solvent methyl isobutyl ketone (MIBK) and p-tert-butylcatechol (TBC) from the first tank The bottom of the reactor is continuously fed into the first tank reactor, the stirring is started and the temperature is raised to the required temperature, and then nitrogen is used to adjust the pressure of the reactor to the set pressure through the constant pressure valve. The reaction liquid in the first tank reactor Continuously enter the second tank reactor through the outlet on the upper side of the reactor through the bottom of the second tank reactor, continue to react under the set conditions, and the reaction product is discharged through the outlet on the upper s...

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Abstract

The invention relates to a vinyl norbornene production method. The method utilizes two tank reactors connected in series and through the reactors, dicyclopentadiene undergoes a pyrolysis reaction to produce cyclopentadiene and the cyclopentadiene and 1, 3-butadiene undergo a Diels-Alder reaction to produce the vinyl norbornene. The method comprises 1, feeding dicyclopentadiene, 1, 3-butadiene, methyl isobutyl ketone as a solvent and a p-tert-butylcatechol solution as a polymerization inhibitor from the bottom of the first tank reactor into the first tank reactor through a pump and carrying out a reaction process under conditions of a reaction temperature of 170-190 DEG C, system pressure of 7-11MPa and material staying time of 10-120min, and 2, carrying out a reaction process in the second tank reactor under the conditions of a reaction temperature of 200-220 DEG C, system pressure of 7-10MPa and material staying time of 10-80min, discharging the reaction solution, feeding the reaction solution into a refining system and carrying out refining to obtain refined vinyl norbornene with content of 99.5% or more. The method improves a product vinyl norbornene yield and effectively prevents polymer formation of individual or all of 1, 3-butadiene and cyclopentadiene.

Description

technical field [0001] The invention relates to a method for preparing vinyl norbornene (VNB) from dicyclopentadiene (DCPD) and 1,3-butadiene (BD), in particular to methyl isobutyl ketone (MIBK) As a solvent, dicyclopentadiene (DCPD) is depolymerized into cyclopentadiene (CPD) in two series-connected tank reactors, and cyclopentadiene (CPD) and 1,3-butadiene (BD) occur Diels-Alder reaction conversion method to vinylnorbornene (VNB). Background technique [0002] The only current use of vinyl norbornene (VNB) is to isomerize it to ethylidene norbornene (ENB) under the action of a strong basic catalyst. ENB is a colorless and transparent liquid at room temperature, with 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 EPDM rubber. Adding ENB can make the rubber molecules branched, and the secondary reaction opportunities of gel formation are less, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/50C07C13/43
CPCC07C2/50C07C4/22C07C13/43C07C13/15
Inventor 石康明
Owner SHANGHAI PEARLK CHEM
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