The present disclosure, according to some embodiments, apparatus, systems, and / or, for example, one or more isocyanates, relates to a method for fractionating a light component, feed mixture comprising a solvent and / or heavy component. In some embodiments, fractionating an isocyanate feed mixture, prior to fractionation zone and / or the tower and rectification section, a non-adiabatic dividing including the main area and / or the tower comprises lateral zones, and stripping section It may include distilling the feed mixture in the distillation apparatus in. For example, isocyanates, light component (s) can be separated from the solvent (s) and / or heavy component (s). Fractionator can, in some embodiments, constructed and arranged as a dividing wall column. According to some embodiments of the present disclosure, apparatus, systems, and / or methods may have can be, and / or a wide operating range that is energy efficient.
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