US PATENT SUBCLASS 203 / 74
.~.~ Distillation of initial distillate

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

71  DF  PLURAL DISTILLATIONS PERFORMED ON SAME MATERIAL {5}
73  DF  .~ One a distillation under positive pressure or vacuum {4}
74.~.~ Distillation of initial distillate {3}
75  DF  .~.~.~> And return of distillation product to a previous distillation zone
76  DF  .~.~.~> Including the addition of water or steam
77  DF  .~.~.~> Initial distillation under positive pressure or vacuum

DEFINITION

Classification: 203/74

(under subclass 73) Processes, in which at least a portion of the distillate from the initial distillation operation is subjected to at least one subsequent distillation operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

45, and 46, for a process of separatory distillation including extracting a distillate with an immiscible liquid.