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Valentin M Belyaev

Izrail M Belgorodsky

Oleg E Batalin

Vladimir I Nevstruev

Arkady S Dykman

Jury I Smolin

Valery A Radionov

Mark I Breiman

Nikolai V Galibin

Vladimir V Kovalenko

Eduard A Tulchinsky

Vitaly V Orlyansky

Galina F Balkhanova

Nikolai Y Zhirnov

Alexandr I Osadchenko

Anatoly I Lukashov

Alexandr P Khardin

Vitaly Vasilievich Orlyansky

Andrian Petrovich Troitsky

Boris N Gorbunov

Pavel Y Gokhberg

Vladimir L Rudkovsky

Adrian P Troitsky

Ljudmila V Shpantseva

A catalyst for decomposition of 1,3-dioxanes, comprising calcium oxide, phosphorus pentoxide, chlorine, water and boron oxide, the ratio of the components as expressed in mass percent being as follows:

Catalyst for decomposition of 1,3-dioxanes

The invention relates to a method of preparing a calcium boron phosphate catalyst, comprising the steps of reacting calcium salts with phosphoric acid salts in aqueous ammonia, separating the resulting precipitate from the reaction mixture thus obtained, suitably shaping said precipitate, drying it, and heat treating at an elevated temperature in the presence of steam or steam with an inert gas, mixed with at least one of the components selected from the group consisting of boric acid and, a mixture of boric and phosphoric acids, the molar ratio of boric to phosphoric acids being between 1.0:1 and 10:1. The reaction of calcium salts with phosphoric acid salts in aqueous ammonia is effected with the starting reactants taken in the molar ratio of 1.5:1 if no phosphoric acid treatment is used, or with the starting reactants in a molar ratio of between 1.5:1 to 5.0:1 if the reaction mixture is treated with a phosphoric acid solution to pH of from 5.0 to 7.0.

Method of preparing calcium boron phosphate catalyst

The method of preparing isoprene and isoamylenes consists in that a gaseous mixture of isobutylene and methyl alcohol is brought in contact with a catalyst, namely aluminum oxide or tantalum pentoxide, at a temperature of 250 to 500.degree. C. It is recommendable that use should be made of aluminum oxide modified with an oxide of at least one of the following elements: molybdenum, tungsten, chromium, zirconium, titanium, vanadium, and cobalt. Moreover, it is possible to use aluminum oxide modified with a sulphate of at least one of the following elements: zirconium and chromium. A combination of both modifications is also possible. The yield of isoprene obtained by the proposed method is 16 to 20 mol. percent, with respect to the passed methyl alcohol, and the yield of isoamylenes is 25 to 30 mol. percent.

Method of preparing isoprene and isoamylenes

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Valentin M Belyaev