US PATENT SUBCLASS 203 / 82
.~.~ And returning distillation product to a previous distillation zone

Current as of: June, 1999
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203 /   HD   DISTILLATION: PROCESSES, SEPARATORY

71  DF  PLURAL DISTILLATIONS PERFORMED ON SAME MATERIAL {5}
81  DF  .~ Distillation of initial distillate {2}
82.~.~ And returning distillation product to a previous distillation zone

DEFINITION

Classification: 203/82

(under subclass 81) Processes including returning a product from a second or subsequent distillation operation in a series to an earlier distillation in the series.

SEE OR SEARCH CLASS

196, Mineral Oils: Apparatus,

99, for mineral oil distilling apparatus including the combination of a vaporizer, condensing means with means for returning a part or all of the condensate to the vaporizer.

208, Mineral Oils: Processes and Products,

355, for a process of subjecting mineral oils to at least two distillation operations including returning vapor, condensate, and/or residue from a later distillation to an earlier distillation zone.