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Oleg E Batalin

Izrail M Belgorodsky

Vladimir I Nevstruev

Arkady S Dykman

Valentin M Belyaev

Mark I Breiman

Nikolai Y Zhirnov

Nikolai V Galibin

Galina F Balkhanova

Vladimir V Kovalenko

Alexandr I Osadchenko

Eduard A Tulchinsky

Vitaly V Orlyansky

Andrian Petrovich Troitsky

Valery A Radionov

Jury I Smolin

Anatoly I Lukashov

Rimma Petrovna Trifonova

Adrian P Troitsky

Evgeny Vasilievich Bart

Nina Andreevna Skachkova

Vladimir Mikhailovich Lebedev

Oleg A Ostroukhov

Ljudmila V Golovko

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

Disclosed is a method of preparing a calcium phosphate catalyst, which comprises reacting a calcium salt with a phosphoric acid salt in aqueous ammonia, separating the precipitate resulting from the reaction mixture thus obtained, suitably shaping said precipitate, drying it, and subjecting it to heat treatment within a temperature range of 450.degree. to 600.degree. C. in the presence of steam mixed with at least one of the components selected from the group consisting of an inert gas, air, phosphoric an acid, aldehyde, an oxygen-containing heterocyclic compound, an alcohol, and a diene hydrocarbon. 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 within the range of 1.5:1 to 5.0:1 if the reaction mixture is treated with a phosphoric acid solution to a pH of from 5.0 to 7.0.

Method of preparing a calcium phosphate catalyst

A method of processing high-boiling byproducts of isoprene production obtained at the first stage of isoprene production by the dioxane method into isoprene, isobutylene and formaldehyde which comprises the catalytic splitting of said products in the vapor phase in the presence of water with a weight ratio therebetween of 1:1/2, respectively, at 250-290.degree. C over aluminum oxide as catalyst. The resulting vapor mixture is catalytically split at 315.degree.-360.degree. C over calcium-phosphate catalyst with the formation of a reaction mixture containing isoprene, isobutylene and formaldehyde.

Method of producing high-boiling byproducts of isoprene production

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Saint-Petersburg, Russia

Oleg E Batalin