METHOD OF PREPARING DEMULSIFIER TO DEHYDRATE AND DESALT WATER-OIL EMULSIONS Russian patent published in 1999 - IPC

FIELD: crude oil treatment. SUBSTANCE: invention is designed for treating high-viscosity stable tar oil stock emulsions with simultaneous protection of oil-field equipment. Two versions of demulsifier preparation are provided involving interaction of polyether with a functional groups-containing compound at heating. According to the first version, interaction of 1 mol of polyether with 1-2 mol of functional compound such as orthophosphoric acid, phosphoric anhydride, dimethyl phosphite, and p-toluenediisocyanate is followed by reaction of resulting intermediate product with 1 mol of carbohydrate. According to the second version, all reaction components interact simultaneously in the same proportions. Resultant demulsifier is then dissolved in organic solvent. EFFECT: improved dehydrating and desalting properties. 3 cl, 3 tbl, 5 ex