FIELD: crude oil treatment.
SUBSTANCE: invention is directed to treatment of crude oil before processing by destroying persistent oil-water emulsions, dehydration thereof, and desalting with various-purpose demulsifier. Preparation of the latter involves preliminary oxypropylenation of nitrogen-containing compound (etylenediamine, tetramethylenediamine, hexametylenediamine, or polyethylene-polyamine) on heating. Resulting mixture is subjected to further oxypropylenation and then oxyethylenation in presence of alkali catalyst on heating. Thus obtained demulsifier is finally dissolved in solvent at weight ratio (45-55):(55-45).
EFFECT: increased efficiency in destruction of oil-water emulsion and in removal of petroleum products from waste waters accompanied by good corrosion protection and anti-deposits effect.
2 cl, 3 tbl, 20 ex
