| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 155743 | Chemical Engineering Science | 2012 | 8 Pages |
The breakup of crude oil emulsions to produce clean oil and water phases is an important task in crude oil processing. We have investigated the demulsification kinetics of a model oil-in-water emulsion in a centrifugal field to mimic the forces acting on emulsion droplets in oil/water separators such as hydrocyclones. The rate of growth of separated oil phase and the change in mean droplet diameter of the emulsion layer was measured as a function of surfactant concentration, centrifugal acceleration and time. Demulsification is enhanced with increasing centrifugal acceleration and time and decreasing surfactant concentration. A kinetic analysis was performed that allows to estimate the characteristic coalescence times between droplets in the emulsion and between a droplet and the separated oil interface. The experimental procedure presented in this work can serve as a simple, but useful test to predict the separation efficiency of emulsions in separators with swirling flow fields.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (63 K)Download as PowerPoint slideHighlights► We present a simple method to assess the stability of emulsions in centrifugal flow fields. ► The change in drop size and growth of pure oil phase in an O/W emulsion was measured. ► A kinetic model is presented that allows calculation of characteristic coalescence times. ► The procedure may be of help for the petroleum industry in choosing a separator for a given produced fluid.
