Mass transfer (diffusion) processes are most common in oil refining. They are carried out in column devices, which, according to their purpose, are divided into rectification, adsorption, absorption and extraction.
Distillation columns serve for a clear separation of components as a result of mass transfer between the liquid and vapor phases.
Adsorbers and absorbers are used to extract the desired components from a mixture using solid and liquid absorbers.
Extractors serve to separate the desired components from the mixture as a result of mass transfer between liquid phases.
