چكيده به لاتين
In this study, the demulsification of water in crude oil was investigated under various
conditions in bench scale by AC current using SDS demulsifier. The effect of various
parameters including temperature, voltage, salinity, and electrode configuration on the
separation efficiency were studied. To prepare a stable emulsion, Maroon 224 crude oil was used. A W/O emulsion, in which the volume fraction of water was 25%, was produced. To eliminate the effect of asphalten and resin a 30wt% aqueous solution of SDS was used. After employing a voltage of 20 kV to a cylinderical cell for 7 minutes, at 22 ˚C, 90% of the suspended water droplets were separated from the emulsion. Further continuing of the process resulted in a more effective separation, i.e. after 11 minutes, the separation efficiency gained 98%. In another phase of the study, effects of temperature, salinity, time, and electrode configuration on separation in both cuboidal and cylinderical cells were investigated. Increasing the temperature up to 55 °C increased efficiency of separation up to about 96%, in the condition that the applied voltage was 6 kV.Further increase in temperature made the efficiency decreased. It was concluded that the relation between temperature and the efficiency of separation is not monotonic. It was deduced that the saltier the emulsion, the less efficient the separation. On the other hand, the results of experiments revealed that there is a direct relationship between the time length of the operation and the separation efficiency. At the end, electrocoelescence of two droplets was simulated by means of Comsol software, and its results were compared to other studies. It was shown that the accuracy of phase field model is more
than volume of fluid model.
