Abstract
Rates of coalescence of oil droplets in aqueous surfactant solutions were investigated with the help of an inclined spinning drop tensiometer. Petroleum sulfonate and petroleum sulfonate in admixture with crude lignosulfonates were used as surfactants, with iso-octane and light crude oil representing the oil phase. Of the four lignosulfonates tested, the magnesium-based one gave the fastest coalescence rate. Addition of divalent cations (Mg 2+, Ca 2+) to sodium-based petroleum sulfonate-lignosulfonate solutions exerted a strong influence on the coalescence behavior of oil droplets. The interfaces were found to shift from mobile to rigid with increasing ionic strength.
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