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OwnerOleg E. Batalin, Arkady S. Dykman +5inventors
InventorsOleg E. Batalin, Arkady S. Dykman, Izrail M. Belgorodsky, Oleg A. Ostroukhov, Ljudmila V. Golovko, Vladimir I. Nevstruev, Anatoly I. Lukashov
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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.
A method of preparing a calcium phosphate catalyst, comprising reacting a water-soluble calcium salt with a water-soluble phosphoric acid salt in aqueous ammonia to form a precipitate, separating said precipitate from the reaction mixture, shaping said precipitate, drying said precipitate, and subjecting said precipitate to heat treatment within a temperature range of 450.degree. to 600.degree. C. in the presence of steam mixed with phosphoric acid, or an organic compound, or phosphoric acid and an inert gas, or phosphoric acid and air, or an organic compound and an inert gas, said organic compound being selected from the group consisting of an aldehyde, an oxygen-containing heterocyclic compound, an alcohol, and a diene hydrocarbon.
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