.~ And returning product of distillation step to distillation zone
DEFINITION
Classification: 203/97
(under subclass 95) Processes in which a product of the distillation operation is returned to the distillation zone.
(1) Note. To be considered a product of distillation for purposes of this subclass an overhead vapor or side stream must be condensed to a liquid before being returned to the distillation zone. In other words to be considered a "product" the substance must be isolated outside the distillation zone.
SEE OR SEARCH CLASS
196, Mineral Oils: Apparatus,
99, for mineral oil distilling apparatus including the combination of vaporizing and condensing means with means for returning a part or all of the condensate to the vaporizer.
208, Mineral Oils: Processes and Products,
358, for a mineral oil distillation process in which condensate or residue is returned to the rectification zone after having been removed therefrom to assist in the vaporization process.
