What are the main types of liquid-liquid extraction equipment?

Major equipment types include: Mixer-settlers (simple, high efficiency, large footprint), Spray columns (simplest, lowest efficiency), Packed columns (improved contact, moderate efficiency), Sieve tray columns (discrete stages, good turndown), Rotating disc contactors (mechanical agitation, high efficiency), Pulsed columns (improved mixing, no moving parts in contact zone), and Centrifugal extractors (compact, short residence time, handles emulsion-forming systems).