US PATENT SUBCLASS 203 / 80
.~.~ Initial distillation under positive pressure or vacuum

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}
80.~.~ Initial distillation under positive pressure or vacuum

DEFINITION

Classification: 203/80

(under subclass 73) Processes in which the initial distillation is carried out under a pressure greater than atmospheric or under a vacuum.

SEE OR SEARCH THIS CLASS, SUBCLASS:

77, for a process including the step of distilling the initial distillate in which the initial distillation is under a pressure greater or less than atmospheric pressure.