Patent ID: 9663705
Date: 2017-05-30
CPC Classifications: B01D,C09K,C10G

Claim:
1. A method of demulsifying a produced emulsion from an enhanced oil recovery flood to give clean water with less than about 300 ppm residual oil and dry oil with less than about 1% total sediment, the method comprising: adding an effective amount of a composition to the produced emulsion, the composition comprising at least one water soluble quaternary adduct of a tertiary amine and a polyepihalohydrin, said adduct being greater than 99% quaternized and having a weight average molecular weight of from about 500 to about 2,500 Daltons; a solvent comprising an organic solvent, water, or a combination thereof, wherein the produced emulsion comprises water and oil, and the quaternary adduct has the general formula: wherein each R is independently methyl or ethyl, X − is a halide selected from the group consisting of fluoride, chloride, bromide, iodide, astadide, or a combination thereof, and z ranges from about 4 to about 22.