PROCESS OF PREPARING DEEMULSIFIER FOR DE-WATERING AND SALTING-OUT OF HYDROCARBON OILS Russian patent published in 1994 - IPC

FIELD: refining of hydrocarbon oils. SUBSTANCE: nonionic demulsifier which is block-copolymer of ethylene and propylene oxides or hydroxyethylated condensate of isononyl phenol and high-boiling residues of 4.4-dimethyl-1.3-dioxane synthesis from formaldehyde and isobutylene is reacted with phosphorilating agent selected from the group consisting of dimethyl or diethyl phosphite, phosphoric anhydride, a phosphoric or phosphorous acid, phosphorus oxychloride, with molar ratio of nonionic deemulsifier to phosphorylating agent being of 1: 0.5-3. The resulting deemulsifier preferably is dissolved in methanol-water mixture, 3: 1. The emulsifier-solvent ratio of the resulting solution, % by weight, is as follows: deemulsifier 45-55; solvent to the balance. EFFECT: increased efficiency. 2 cl, 2 tbl