Preparation method of endo-tetrahydrodicyclotadiene isomerization catalyst

Abstract

The invention discloses a preparation method of an endo-tetrahydrodicyclotadiene isomerization catalyst. The catalyst is composed of an ultra-stable Y-type molecular sieve, active aluminum oxide with different pore diameter distributions and metal with hydrogenation activity. The catalyst disclosed by the invention has the advantages of simple preparation method and easiness of industrialized application; the catalyst has relatively good endo-tetrahydrodicyclotadiene isomerization activity and selectivity and has a relatively long service life.

Description

technical field [0001] The invention relates to a preparation method of a bridged tetrahydrodicyclopentadiene isomerization catalyst. The isomerization catalyst is prepared from ultra-stable Y-type molecular sieves, activated alumina with different apertures and metals with hydrogenation activity. Background technique [0002] Using dicyclopentadiene (DCPD) as a raw material, it is first hydrogenated to obtain bridged tetrahydrodicyclopentadiene (endo-THDCPD), and then isomerized into hanging tetrahydrodicyclopentadiene (exo-THDCPD) under the action of an acidic catalyst. -THDCPD), is a low-temperature liquid fuel with excellent performance, which has been widely used in the propulsion of missiles, aircraft and torpedoes, and has become an indispensable fuel for the aerospace industry. [0003] The isomerization of bridge tetrahydrodicyclopentadiene to prepare pendant tetrahydrodicyclopentadiene can use traditional strong L acid anhydrous aluminum trichloride, molecular siev...

AI Technical Summary

Problems solved by technology

[0006] In summary, traditional anhydrous A1C1 3 Catalysts and batch processes have the disadvantages of polluting the environment, corroding equipment, and not being easy to separate from the product, while A1C1 3 The preparation method of immobilized catalyst is extremely cumbersome and sensitive to water

Porous molecular sieves with appropriate pore size (ZSM-5 and H-beta molecular sieves are limited to pore size, which is not conducive to the diffusion of reactants and products, so they are not suitable as a catalyst for this isomerization reaction) and other solid acid catalysts and fixed bed isomerization The chemical process is an effective way to solve the above problems, but under the reaction conditions, the conversion rate is low, the molecular sieve is prone to carbon deposition and deactivation, and it is necessary to study the method of prolonging the service life of the catalyst.

As for the technique of dicyclopentadiene one-step preparation of pendant tetrahydrodicyclopentadiene, there is a large difference in the reaction conditions required for hydrogenation-isomerization: the hydrogenation reaction requires a relatively low reaction temperature and relatively low temperature. High hydrogen pressure, the isomerization reaction is just the opposite, relatively low hydrogen pressure and high reaction temperature are more favorable, so the two should not be carried out in the same reactor, otherwise the service life of the catalyst will be severely shortened, and it cannot Meet the needs of industrial production

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