Emulsion of viscous hydrocarbon in aqueous buffer solution...

B - Operations – Transporting – 01 – J

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B01J 13/00 (2006.01) C10L 1/20 (2006.01) C10L 1/32 (2006.01)

Patent

CA 2111942

ABSTRACT A method for forming a stable emulsion of a viscous hydrocarbon in an aqueous buffer solution includes the steps of: providing a viscous hydrocarbon containing an inactive natural surfactant and having a salt content by weight of less than or equal to about 15ppm and having a water content by weight of less than or equal to about 0.1%; forming a solution of a buffer additive in an aqueous solution to provide a basic aqueous buffer solution, the buffer additive being operative to extract and activate the inactive natural surfactant from the viscous hydrocarbon; and mixing the viscous hydrocarbon with the aqueous buffer solution at a rate sufficient to provide an emulsion of the viscous hydrocarbon in the aqueous buffer solution, whereby the buffer additive extracts the inactive natural surfactant from the viscous hydrocarbon into the aqueous buffer solution and activates the inactive natural surfactant so as to stabilize the emulsion. According to the invention, the buffer additive is a water soluble amine. The inactive natural surfactant contained in the viscous hydrocarbon includes carboxylic acids, phenols, esters, and mixtures thereof. Bimodal emulsions, having two distinct droplet size distributions, are also formed according to the method of the present invention and have improved viscosity characteristics. 34

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