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Bagadur K Zeinalov

Vagab S Aliev

Jury N Bocharov

Vladimir D Lugovskoi

Akop A Miramanian

Arif A Akhundov

A method for preparing naphthenic acids consists in that a petroleum fraction is oxidized at a temperature of 135.degree.-140.degree. C. in the presence of catalyst consisting of manganese naphthenate and potassium naphthenate; the obtained mixture of organic oxygen-containing compounds containing naphthenic and hydroxynaphthenic acids is diluted with an organic solvent, and the hydroxynaphthenic acids are precipitated and separated; the solution of the organic oxygen-containing compounds freed from hydroxynaphthenic acids in said organic solvent is treated with an aqueous solution of sodium hydroxide; thus obtained aqueous solution of sodium naphthenates is separated; said aqueous solution of sodium naphthenates is treated with diethyl sulphate at a temperature of 90.degree.-95.degree. C. to isolate ethyl naphthenates from which a fraction of ethyl naphthenate boiling out in a temperature range of 75.degree.-170.degree. C. is separated by rectification in vacuum of 3 mm Hg; the isolated fraction of ethyl naphthenates is treated with an aqueous solution of sodium hydroxide and the end product is isolated by the action of mineral acids.

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Bagadur K Zeinalov