PROCEDURE FOR DECOMPOSITION OF WATER-OIL EMULSIONS Russian patent published in 2017 - IPC C10G33/04 B01D17/05 

FIELD: oil and gas industry.

SUBSTANCE: procedure for decomposition of water-oil emulsions is carried out by bringing into contact with the water-oil emulsion of a demulsifying composition containing bottoms of alcohol production, a nonionogenic surfactant and a solvent using as bottoms of alcohol production the production bottoms of butyl alcohols, oil aldehydes, 2-ethylhexanol, 2-ethylhexanoic acid, ethylene-propylene and ethylbenzene, having the following chemical composition, wt %: diester (2-ethylhexyl) 4.60-4.98; 2.4-diethyl-1.3-octanediol 6.80-8.50; isobutyric aldehyde 0.17-0.58; N-butyraldehyde 5.48-6.13; 2-ethylhexanoic acid 6.08-6.87; 2.2.4-trimethyl-1.3-pentanediol 3.31-3.72; butyl-2-ethylhexanoate 13.98-15.03; 2-ethylhexyl-2-ethylhexanoate 2.57-2.81; butyl butyrate 1.20-1.46; 2-ethylhexyl butyrate 1.71-1.87; 2.2.4-trimethyl-1.3-pentadiol-diisobutyrate 0.45-0.53; 2-ethylhexanoic acid anhydride 1.79-1.93; 2-ethylhexanol 0.16-0.19; 2,4-dipropyl-5-ethyl-1.3-dioxane 0.28-0.56; Σ unidentified high-boiling components up to 100. The nonionogenic surfactant is selected from the group of block copolymers of alkylene oxides, or from a number of modified block copolymers of alkylene oxides, or from a series of oxyethylated phenolic or phenol formaldehyde resins, and as a solvent, low molecular weight alcohols or aromatic hydrocarbons in a mixture with isopropyl alcohol in a volume ratio of (5 -7):1, respectively, with the following component ratio, vol. %: the indicated bottoms 5-12, the specified nonionogenic surfactant 38-45, the solvent is the rest. The total amount of the noted bottoms and nonionogenic surfactant is 50 vol. %.

EFFECT: increased efficiency of water-oil emulsions separation at a reduced temperature, while ensuring the high quality of the separated water, by reducing the content of oil and particulate matter in it, including manifold and mixed water-oil emulsions, as well as for water-oil emulsions with increased content of paraffin, at the same time ensuring deep dehydration of oil.

3 cl, 4 tbl