Method and system for monitoring liquid-liquid extraction

A system comprising:

• a light source configured to emit light;
• a transparent container configured to flow a liquid mixture from one end of the transparent container to another end of the transparent container in a liquid-liquid extraction system, wherein the liquid mixture comprises a first liquid and a second liquid that are different from one another, and wherein a flow rate of the liquid mixture is adjusted based on dynamic viscosity of the liquid mixture, interfacial tensions, density of the liquid mixture, capillary number, Reynolds number, and a shape of the transparent container to ensure phase entrainment appear as one or more droplets in a squeezing and non-turbulent form within the liquid mixture as the liquid mixture flows within the transparent container and from the one end to the another end of the transparent container;
• a sensor configured to measure a plurality of light intensities associated with the transparent container being illuminated by the light source, wherein a light intensity associated with a portion of the liquid mixture that includes the one or more droplets is different from a light intensity associated with another portion of the liquid mixture that does not include the one or more droplets;
• and
• a processor coupled to the detector and configured to process the measured plurality of light intensities to determine phase entrainment metrics associated with the liquid mixture, wherein the phase entrainment metrics include one or more of number of phase entrainments, bulk phase presence, and concentration associated with the first liquid and the second liquid,
• wherein the processor is configured to determine a ratio of a light intensity associated with the one or more droplets to a light intensity associated with liquid in absence of the one or more droplets, wherein the ratio is associated with the bulk phase presence.