A method for recovering water soluble surfactants

B - Operations – Transporting – 01 – D

Patent

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B01D 11/04 (2006.01) C09K 8/52 (2006.01) E21B 37/06 (2006.01) C09K 8/584 (2006.01)

Patent

CA 2391447

Disclosed is a method for recovering and re-employing ionic surfactants from aqueous solutions and dispersions/emulsions of water and liquid hydrocarbons by the addition of a second polar phase as well as an inorganic salt which causes the preferred partitioning of the surfactant by providing a preferred ionic strength phase for the surfactant. More specifically, the method applies to recovering hydrate growth inhibitor/modifying compounds, comprising cationic surfactant, such as, for example, ammonium, phosphonium, and sulphonium alkylated compounds, which have been added to a fluid effluent of a hydrocarbon production well, the effluent including water, hydrate inhibitor compound, at least one additional polar solvent, and inorganic salt, by a method comprising adding sufficient additional ions of inorganic salt and, if necessary, an alcohol/glycol to the effluent to form a second polar phase, less polar than the aqueous phase, into which the hydrate inhibitor can then dissolve and be separated from the brine.

L'invention concerne un procédé servant à la récupération et à la réutilisation de composés tensio-actifs ioniques dans des solutions aqueuses et des dispersions/émulsions d'hydrocarbures aqueuses et liquides par addition d'une seconde phase polaire et d'un sel inorganique. De cette manière, en conférant une phase à force ionique préférée au composé tensio-actif, on peut obtenir une séparation préférée de celui-ci. Plus précisément, le procédé concerne la récupération de composés inhibiteurs/modificateurs de croissance hydratés, comprenant des composés tensio-actifs cationiques tels que, par exemple, des composés alkylés d'ammonium, de phosphonium et de sulfonium, ajoutés à un effluent fluidique d'un puits de production d'hydrocarbures, l'effluent contenant de l'eau, un composé inhibiteur hydraté, au moins un solvant polaire supplémentaire et un sel inorganique, selon un procédé consistant à ajouter suffisamment d'ions supplémentaires de sel inorganique et, si nécessaire, un alcool/glycol à l'effluent pour former une seconde phase polaire, moins polaire que la phase aqueuse, dans laquelle l'inhibiteur hydraté peut alors se dissoudre et être séparé de la saumure.

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