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
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Authors
Dates
2021-07-28—Published
2020-10-21—Filed