Other

Anatoly I Lukashov

Izrail M Belgorodsky

Alexandr P Khardin

Vitaly Vasilievich Orlyansky

Boris S Korotkevich

Oleg E Batalin

Jury A Shmuk

Valentin M Belyaev

Vladimir I Nevstruev

Arkady S Dykman

Boris N Gorbunov

Boris Nikolaevich Gorbunov

Izmail Vladimirovich Garmonov

Pavel Y Gokhberg

Albert V Tabakov

Mikhail L Dvoretsky

Nikolai I Svintsov

Vladimir Alexandrovich Krol

Lidia P Shapovalova

Gavril I Vasiliev

Arkady Samuilovich Estrin

Valentina D Kandalova

Evgeny A Malov

Galina Dmitrievna Efremova

Daniil Iosifovich Valdman

Larisa Mikhailovna Davydova

Jury Alexandrovich Lvov

Ljudmila V Shpantseva

Anatoly Vasilievich Gagin

Dzantemir N Tmenov

Lidia Mikhailovna Pospelova

Gennady P Zhestovsky

Nikolai Fedorovich Kovalev

Lidia Vladimirovna Erokhina

Ljubov Petrovna Bataeva

Ljudmila V Golovko

Roman I Polataiko

Vladislav Petrovich Smirnov

Valery P Lukyanenko

Elena Nikolaevna Kropacheva

Valentin Vasilievich Sazykin

Efim Moiseevich Sire

Lev Moiseevich Kogan

Semen Moiseevich Kavun

Basia Moiseevna Bolkhovets

Anatoly Sergeevich Lykin

Oleg A Ostroukhov

Natalya Borisovna Monastyrskaya

Evgeny Maximovich Kukartsev

Ideya Antonovna Churikova

Olga Izrailevna Belgorodskaya

Vladimir L Rudkovsky

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 process for producing unsaturated hydrocarbons which comprises contacting a paraffin, monoolefin and/or alkylaromatic compounds with a catalyst at a temperature within the range of from 400.degree. to 700.degree. C. in the presence of an inert gas and/or steam. The catalyst comprises a carrier having deposited thereonto an oxide of molybdenum in an amount of from 5 to 35% by weight of the catalyst. As the carrier, use is made of a granulated porous crystalline silica modified with magnesia in an amount of from 1 to 20% by weight of the carrier; a granulated magnesium-titanium carrier consisting of 50 to 95% by weight of MgO and 50 to 5% by weight of TiO.sub.2, or a granulated magnesium-aluminum carrier consisting of 70 to 95% by weight of MgO and 5 to 30% by weight of Al.sub.2 O.sub.3. Through the spent catalyst an oxygen-containing gas is passed at a temperature within the range of from 400.degree. to 700.degree. until catalytic activity is restored to the catalyst. The process, according to the present invention, ensures a high selectivity; substantially simplifies temperature control in the reaction zone; avoids the possibility of forming of a hazardous mixture of hydrocarbons with oxygen; and simplifies purification of waste waters.

Process for producing unsaturated hydrocarbons

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

Modified and stabilized synthetic cis-1,4 polyisoprene is a product of chemical interaction between synthetic cis-1,4 polyisoprene containing no less than 95 percent of cis-1,4 units and 0.05 to 1 mass percent of 4-nitrosodiphenylamine. The proposed method of making this product comprises polymerization of isoprene in hydrocarbon solvent in the presence of Ziegler-Natta catalyst, the addition to the polymerization mass of 0.05 to 1 mass percent of, and degassing and drying of the rubber thus produced. The product possesses improved properties, including good stability in the course of storage and machining. Unvulcanized rubber mixed on the basis of this product are marked by a high adhesion strength, whereas the vulcanizates have splendid elastic hysteresis and fatigue characteristics. The quality of the novel product is in no way inferior to that of natural rubber.

Modified and stabilized synthetic cis-1,4 polyisoprene and method for

The method of preparing 4,4-dimethyldioxane-1,3 consists in the interaction of isobutylene and formaldehyde in an aqueous medium at from 90.degree. to 115.degree. C in the presence of a catalyst, the capacity of which such inorganic salts of mineral acids may be used with the pH value of the aqueous solutions whereof being within 2.2 to 4.5, resulting in the formation of an organic and an aqueous phase containing the end product, followed by the separation of said phases, washing the organic phase with water, and isolation of the end product. When a catalyst of such salts is used, the acidity of the aqueous solutions of which is either invariable or decreases with an increase in the salt concentration, it is expedient that the aqueous phase and the wash water be evaporated to a level of from 85 to 90 percent to form a fraction containing the unreacted formaldehyde, and a distillation residue which is in fact an oil bed and a salt bed with the latter, after having been separated, being returned to the stage of interaction of the starting reagents.

Method of preparing 4,4-dimethyldioxane-1,3

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Moscow, Russia

Anatoly I Lukashov