.~ And returning distillation product to a previous distillation zone
DEFINITION
Classification: 203/84
(under subclass 71) Processes which includes returning a product from a later distillation operation to a distillation zone prior to the distillation zone in which the product was produced.
SEE OR SEARCH THIS CLASS, SUBCLASS:
43, for a separatory distillation process in which the initial residue is extracted with a liquid.
75, 78, 82, for other plural distillation processes in which at least a portion of a product of a second or subsequent distillation step is returned to a distillation zone prior to the one in which the product was produced and subclass 98, in which a separated product of a single separatory distillation operation is returned to the distillation zone.
SEE OR SEARCH CLASS
196, Mineral Oils: Apparatus,
99, for mineral oil distilling apparatus including the combination of a vaporizing and condensing means with means for returning a part or all of the condensate to the vaporizer. 208, Mineral Oils: Processes and Products,
355, for processes in which mineral oil is subjected to at least two distillation operations in which either vapors, condensate, and/or residue from a later distillation zone is returned to an earlier distillation zone.
