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Vladimir Avgustovich Yanshevsky

Jury Ivanovich Michurov

Yakov Abramovich Gurvich

Alexandr G Liakumovich

Igor Jurievich Logutov

Rufina Alexandrovna Filippova

Valerian Mikhailovich Sobolev

Izrail M Belgorodsky

Evgeny L Styskin

Simona T Kumok

Olga Fedorovna Starikova

Alexandr Afroimovich Grinberg

Viktor Karlovich Tsyskovsky

Sofya Alexandrovna Egoricheva

Sergei Gerasimovich Vyborov

Nokhum Davidovich Gilchenok

Grigory Iosifich Rutman

Jury Nikolaevich Juriev

Ljudmila Vasilievna Berezova

Alexei S Polenov

Engel R Adigamov

Evgeny Semenovich Zelikman

Jury Leonidovich Moskovich

Dmitry Vasilievich Mushenko

Vladimir Leonidovich Klimenko

Method of removing aluminum-containing catalyst from phenol alkylation products comprises treating phenol alkylation products with water at a temperature of 165.degree.-250.degree. C., with water being in molar excess to aluminum in a range of 3-20. The resulting residue of meta-aluminate is easily separated by filtration. The present invention allows eliminating constant control of aluminum content in alkylation products, easily removing the catalyst therefrom and eliminating the loss of phenol alkylation products.

Method of removing aluminum-containing catalyst from phenol alkylation

A method for preparing 2,6-ditert.butylphenol which comprises alkylation of phenol in the presence of monotert.-butylphenol and a catalyst, viz. aluminium dissolved in phenol with gradually lowering the process temperature from 120.degree. to 50.degree. C and reducing the concentration of isobutylene in the mixture of isomeric butenes from 80 to 1.5 mol.%, followed by isolation of the desired product. The method according to the present invention makes it possible to achieve a high degree of conversion of isobutylene without impairing quality of the desired product. The amount of by-products formed in the process is 2-3 times as less as in the prior art methods.

Method for preparing 2,6-ditert.butylphenol

A method of producing 2,2'-methylenebis(4,6-dialkylphenols) residing in that 2,4-dialkylphenols interact with acetals in the presence of an acid catalyst at a temperature from 30.degree. C to 140.degree. C with the formation of a reaction mixture containing the desired product and with subsequent separation of the desired product from said mixture, the starting reagents being taken in amounts of 1 mole of 2,4-dialkylphenol per 1-10 moles of acetal. The method is technologically simple and accomplished without the formation of waste water.

Method of producing 2,2 '-methylenebis(4,6-dialkylphenols)

A method for preparing dicarboxylic acids by subjecting cycloolefins to ozonolysis in a medium of lower monocarboxylic acids so as to form an ozonalyzate; treating the ozonalyzate with a solution of hydrogen peroxide; passing the thus obtained mixture through a solid acid catalyst, such as an Amberlite IR-120 cation-exchange resin; and subjecting the thus obtained catalyzed product first to thermal treatment at a temperature of from 50.degree. to 80.degree.C and then to thermal decomposition at a temperature of from 90.degree. to 110.degree.C to form desired dicarboxylic acids such as succinic, suberic or 1,10-decanedicarboxy acids, depending on the starting cycloolefin, in a yield 98 per cent of the theoretical value and of 99.5 per cent purity.

Method for preparing dicarboxylic acids

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Novokuibyshevsk, undefined

Vladimir Avgustovich Yanshevsky