Other

Boris S Korotkevich

Jury A Shmuk

Alexandr G Liakumovich

Genrikh A Tolstikov

Valery P Juriev

Elena Yakovlevna Mandelshtam

Jury Ivanovich Michurov

Valerian Mikhailovich Sobolev

Boris Izrailevich Pantukh

Anatoly I Lukashov

Grigory I Rutman

Valentin Pavlovich Shatalov

Vasily P Popov

Sagid R Rafikov

Leonid Vasillevich Kovtunenko

Ulchar Ashraf Mamedov

Albert V Tabakov

Viktor Georgievich Minaev

Mikhail L Dvoretsky

Lidia P Shapovalova

Roman I Polataiko

Sergei Timofeevich Petukhov

Gavril I Vasiliev

Valentina D Kandalova

Naum Mikhailovich Starominsky

Evgeny A Malov

Usein M Dzhemilev

Dzantemir N Tmenov

Izmail Mikhailovich Basiev

Gennady P Zhestovsky

Alexandr Julievich Shteinbok

Nikolai I Svintsov

Alexei Semenovich Strukov

Sergei Mikhailovich Krasilnikov

Nikolai Alexandrovich Juzhakov

Svetlana Mikhailovna Lashova

Vladimir Alexandrovich Volnakov

Stanislav S Shavanov

Valery P Lukyanenko

Ilya Yakovlevich Poznyak

Nikolai Pavlovich Shmarovoz

Gennady Mikhailovich Tolstopyatov

Sofia A Egoricheva

Elena Y Mandelshtamm

Tatyana Alexeevna Kornilova

Jury B Monakov

Gennady Nikolaevich Petrov

Boris I Pantukh

Alexandr Fedorovich Zinoviev

Mengzda K Sultanova

A method of preparing trans-, trans-, trans-1,5,9-cyclododecatriene which comprises cyclotrimerization of butadiene at a temperature within the range of from 50.degree. to 150.degree. C. in the presence of a catalytic system consisting of a compound of bivalent nickel, an organo-aluminium compound of the formula (1) or (2):

Method of preparing trans-, trans-, trans-1,5,9-cyclododecatriene

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

A process for preparing cis-polyisoprene which comprises polymerization of isoprene in a medium of a non-polar hydrocarbon solvent at a temperature ranging from 0.degree. to 60.degree. C in the presence of a catalyst comprising a reaction product of titanium tetrachloride and an intracyclic organo-aluminium compound having the formula: ##STR1## wherein R, the same or different, are H, CH.sub.3 ; taken in a molar ratio of 1:1.05-1.1 respectively; weight ratio of isoprene to said catalyst being equal to 100:0.2-0.7. The present invention makes it possible to improve the quality of the thus-obtained cis-polyisoprene and to increase the catalyst capacity by two times due to modification of its properties.

Process for preparing cis-polyisoprene

A method of preparing copolymers of conjugated diene monomers and monovinylaromatic monomers having a random distribution of monomer units in the presence of a catalyst, metallic lithium in granules, and a modifying additive soluble in a reaction medium and consisting of reaction products of potassium or sodium carbonate, acetate or hydroxide with organoaluminum compound of the general formula:

Method for preparing copolymers from conjugated dienes and

A method of isolating rubber-like polymers from hydrocarbon solutions comprises at least three steps of steaming and a device for realization of this method in which the hydrocarbon solution is delivered into the upper section of the vertical column of the device, which is the first steaming step at which the temperature is maintained within the range from 80.degree. to 180.degree.C. At the first steaming step, the hydrocarbon solution is processed by steam which is delivered into the sections of the device through the steam intake. During this process the main bulk of the solvent is evaporated and the polymer is isolated in the form of granules. The solvent vapor, together with steam, are delivered to the condensation step. The isolated granules of the polymer are mixed with water to prepare an aqueous suspension by mechanical stirring means which are provided in each separate section of the column. The suspension is continually delivered along the means for the passage of the suspension into the lower sections of the column, which are the next steps of the steaming process. At these steps the suspension is also treated with steam, mixed, and the vapors are withdrawn. The temperature at all subsequent steps of the steaming process, (except the last step, which is accomplished in the lower section) is maintained in the range from 115.degree. to 180.degree.C. The lower section is provided with a means for decreasing pressure of the aqueous suspension delivered into it from the previous section. Owing to this fact, the temperature at the last step of the steaming process also decreases and is maintained in the range from 90.degree. to 110.degree.C. Vapors that are formed in the lower section (as the pressure decreases) are withdrawn from it through a connection located in the upper part of the section. The suspension is withdrawn from the lower section, the polymer granules are separated from water, and finally dried.

Method of and device for isolation of rubber-like polymers from

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Moscow, Russia

Boris S Korotkevich