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Konstantin N Bildinov

Lev Moiseevich Yagupolsky

Valerian Mikhailovich Sobolev

Valery Y Semeny

Ninel G Feschenko

Alexandr V Kirsanov

Leonid K Eratov

Oleg P Yablonsky

Alexei P Kharchenko

Jury V Orlov

Petr V Serebrov

Olga V Bogdanova

Rimma G Kuzovleva

Boris A Plechev

Ariadna B Kirnos

Stanislav J Pavlov

Tatyana G Dorofeeva

Boris E Ivanov

Sergei G Kuznetsov

Mikhail A Korshunov

Svetlana B Boikova

Valentina A Stepanova

Alevtina A Goncharenko

Gennady A Stepanov

Vladimir N Zavatsky

Mikhail I Lyapunov

Alexandr N Bushin

A method of separating proximate boiling-point hydrocarbons using solutions of monovalent copper salts in solvents, said solvents being alkyl-substituted amides and alkyl esters of phosphorus-containing acids having a P.dbd.O group, N-alkyl-substituted amides of carboxylic acids, N-alkyl-substituted lactams, dialkyl sulphoxides, alkoxynitriles and N-alkyl-substituted aminonitriles. The method can be used for separating hydrocarbons from small quantities of acetylene compounds and cyclopentadiene. Large quantities of acetylene compounds are separated from the mixture of proximate boiling-point hydrocarbons by contacting the mixture with said solvents containing no salts of monovalent copper.

Separating unequally saturated hydrocarbons with monovalent copper salt

Novel compounds, viz., tris(perfluoroalkyl)phosphine oxides have the following general formula ##STR1## where R.sub.F is a perfluoroalkyl of normal and iso-structure, having from 2 to 8 carbon atoms. The method of preparing said compounds consists in that trialkylphosphine oxide having the general formula R.sub.3 PO, where R = C.sub.8 -C.sub.8, is fluorinated electrochemically in a medium of anhydrous hydrogen fluoride; whenever trialkylphosphine oxides having the general formula R.sub.3 PO, where R = C.sub.5 - C.sub.8, are used as the starting material, they are first brominated in a medium of anhydrous hydrogen fluoride, with subsequent isolation of the end product. The proposed novel compounds can be used as solvents for salts of rare earth elements and as complexing agents in the separation of valuable metals.

Method of tris(perfluoroalkyl)phosphine oxides

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Konstantin N Bildinov