What causes emulsion formation in liquid-liquid extraction and how is it addressed?

Emulsions form when one liquid disperses into stable droplets in another, stabilized by surfactants, fine solids, or asphaltenes at the interface. Causes: excessive mixing energy, presence of surface-active contaminants, pH extremes affecting interfacial tension. Solutions: chemical demulsifiers (destabilize interfacial film), electrostatic coalescers (for conductive systems), centrifuges (mechanical separation), heat treatment (reduce viscosity, weaken film), pH adjustment, settling time extension, coalescing media, and reducing mixing intensity while maintaining mass transfer.