Method for preparing ethylidene norbornene by isomerization of vinyl norbornene

Abstract

The invention discloses a method for preparing ethylidene norbornene by isomerizing vinyl norbornene. The method comprises the following steps: 1) preparing a solid alkali catalyst: preparing the solid alkali catalyst from alkali metal and alkali metal hydroxide by using ammonium aluminum carbonate hydroxide as a carrier precursor, wherein the alkali strength of the solid alkali catalyst is 20-33,and the alkali content of the solid alkali catalyst is 5-15 mmol.g<-1>; 2) adding dewatered vinyl norbornene into a stirring kettle, introducing inert gas, and preheating the stirring kettle to a reaction temperature; and 3) adding the weighed solid alkali catalyst into the stirring kettle in batches, carrying out heat-preservation stirring reacting at the reaction temperature for 1-10 h, coolingthe obtained reaction product to room temperature, and filtering the cooled reaction product to obtain a filtrate that is the ethyl norbornene. The method has the advantages of simple and easily controlled process, good mass transfer and heat transfer effects, obtaining of the high-quality pure product, adjustability in the heterogeneous ratio of the reaction product, and small use amount easy separation of the catalyst.

Description

technical field [0001] The invention relates to a method for preparing ethylidene norbornene by isomerizing vinyl norbornene, that is, a process and a formula for preparing ethylidene norbornene by using a solid base to isomerize vinyl norbornene. 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 the synthesis of 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 EPDM. monomer. In recent years, the application of ENB has further expanded to the downstream elastomer materials and similar fields of multi-variety norbornene compounds with bro...

AI Technical Summary

Problems solved by technology

However, for solid bases, especially solid super strong bases, the higher the base strength, the harsher the preparation and storage conditions, the higher the reaction temperature rise and it is difficult to control, and the corrosion is strong.

In addition, the isomer ratio of the two isomers of ENB in ​​the product also has a certain potential impact on its later application, but there is currently no patent report on the regulation of the product isomer ratio

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