US PATENT SUBCLASS 208 / 355
.~.~.~.~ With product recycle between distillation zones

Current as of: June, 1999
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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

308  DF  FRACTIONATION {5}
347  DF  .~ Distillation {12}
350  DF  .~.~ Rectification {7}
354  DF  .~.~.~ Plural or combined with additional distillation {1}
355.~.~.~.~ With product recycle between distillation zones

DEFINITION

Classification: 208/355

(under subclass 354) Processes wherein either the vapors, condensate and/or residue from a later distillation zone is returned to an earlier distillation zone.

(1) Note. In the processes classified herein, condensate may be recycled as a diluent or a condensing medium; heated residue may be recycled to effect reboiling of distilland in the earlier stage; or vapor may be recycled to assist in vaporizing and stripping of the lower boiling constituents from the higher boiling constituents.

SEE OR SEARCH CLASS

203, Distillation: Processes, Separatory,

75, 78, 82, and 84, for a distillation process including the step of returning a vapor, condensate and/or residue from a later distillation zone to an earlier distillation zone.