DEEMULSIFIER Russian patent published in 2000 - IPC

FIELD: preparation of petroleum for processing. SUBSTANCE: described is preparation of petroleum by dehydration thereof to ensure protection of equipment and pipelines against corrosion. Deemulsifier comprises polyurethane of general formula: wherein m is 43-60, n is 7-40, and x is 1-4, R is , block- copolymer of alkylene oxides of general formula: (1) or (2) HO(C₂H₄O)_b(C₃H₆O)_a(C₂H₄O)_b (1) wherein a is 34-53 and bis 6-35, wherein c is 17-26, d is 6-23 and solvent, ratios of components being as follows, wt %: polyurethane of above-indicated formula, 5-45; block copolymers of general formula 1 or 2, 5-45; and solvent, the balance. Deemulsifier has higher efficiency in separating water-pil emulsions at lower temperatures and has high content of mechanical impurities. EFFECT: improved properties of the deemulsifier. 7 tbl