METHOD FOR OBTAINING CATALYST AND METHOD FOR OBTAINING EXO-TETRAHYDROCYCLOPENTADIENE IN ITS PRESENCE Russian patent published in 2021 - IPC B01J37/04 B01J37/08 B01J21/08 B01J27/125 C07C13/61 C07C5/22 

FIELD: chemical industry.

SUBSTANCE: invention relates to the field of heterogeneous catalysis, more specifically to the method for isomerization on a heterogeneous catalyst, AlCl₃ (deposited on silica gel) of endo-tetrahydrodicyclopentadiene into exo-tetrahydrodicyclopentadiene, which, in turn, is the most important component of a liquid high-energy fuel of the JP-10 type. A method for obtaining a catalyst for the production of exo-tetrahydrodicyclopentadiene is proposed, including heating a silica gel with a particle size of 0.31-0.34 mm in a vacuum of 1×10^-4 T21 to a temperature of 280-330°C for 2-4 hours, cooling it to room temperature, adding anhydrous aluminum chloride to the silica gelб AlCl₃ with stirring in an argon current, heating the reaction mixture in a vacuum of 1-1. 5×10^-4 T to a temperature of 78-85°C and holding at this temperature for the time necessary for the interaction of AlCl₃ with the hydroxyl groups of silica gel to form one covalent bond, and aluminum chloride is taken in an amount that ensures the aluminum content in the catalyst-0.78-3.4б weight percentage. A method for producing exo-tetrahydrodicyclopentadiene by isomerization of endo-tetrahydrodicyclopentadiene in the presence of a catalyst at an elevated temperature in a nonpolar hydrocarbon solvent is also proposed, in which AlCl₃(SiO₂) containing 0.78-3.4, weight percentage, of AlCl₃ as the active component used as a catalyst and taken in an amount that provides the ratio of exo-tetrahydrodicyclopentadiene/AlCl₃ (SiO₂) equal to 50-300:1, and the reaction is carried out for 20-535 minutes at a temperature of 17-80°C in the argon medium. Preferably, a solvent selected from the following series is used as a solvent: hexane, heptane, cyclohexane, tetradecane.

EFFECT: increase in the yield of the target product, exo-THDCPD, while maintaining high selectivity, the absence of by-products, as well as the reduction of the reaction time and the possibility of simple product isolation.

3 cl, 1 tbl, 6 ex