FIELD: petroleum processing. SUBSTANCE: process includes washing fraction by aqua-ammonia solution with subsequent reagent regeneration, while simultaneously isolating crude petroleum acids and producing petroleum product that reliably meets corresponding standard requirements. Treatment of petroleum fraction by aqua-ammonia solution and subsequent washing by aqueous phase separated from liquid petroleum acid-containing mixture followed by deoiling alkaline waste with light hydrocarbon solvent are carried out in countercurrent multi-step columns whereas concentrated aqua-ammonia solution produced upon alkaline waste destruction and exhausted wash water are introduced into reagent tank. EFFECT: simplified technology (one circulation line) and stabilized quality of product. 1 dwg, 2 tbl
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