METHOD OF PREPARING DEMULSIFIER FOR DESTRUCTING AQUEOUS CRUDE OIL EMULSIONS Russian patent published in 2002 - IPC

FIELD: chemical industry. SUBSTANCE: method comprises condensing alkylphenol or dialkylphenol wherein C₄-C₃₀, alkyl and formaldehyde in the presence of acid catalyst during heating operation at alkylated phenol to formaldehyde molar ratio of 1: (0.8-1.2) and subsequently oxyethylating condensation product to attain content of oxyethyl groups of 30-70 wt % in the resulting product. Formaldehyde is solution in methanol or formalin or paraform. EFFECT: preparation of efficient deimulsifier having inhibitory effect from asphalt-resin-paraffin deposits. 2 cl, 61 ex, 2 tbl