Abstract
Oil-in-water emulsions stabilized by asphaltene-treated kaolinite clay particles were demulsified by the addition of fresh oil. It was found that when both the oil droplet diameter and the initial clay concentration in the water were kept constant, the demulsification rate exhibited a minimum at a clay contact angle of about 90°. However, when the clay concentration at the oil droplet surface was kept constant for different clay contact angles, the demulsification rate increased monotonically with an increase in the contact angle. Having a larger oil droplet, a high volume fraction of oil in the concentrated emulsion and a large amount of fresh oil addition gave a higher demulsification rate. Raising the clay concentration at the oil droplet surface led to a slower demulsification rate. The viscosities of both the fresh oil and the oil in the primary emulsion had little influence on the demulsification rate.
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