US PATENT SUBCLASS 208 / 354
.~.~.~ Plural or combined with additional distillation

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.~.~.~ Plural or combined with additional distillation {1}
355  DF  .~.~.~.~> With product recycle between distillation zones

DEFINITION

Classification: 208/354

(under subclass 350) Processes wherein there are either two or more distinct rectification zones or at least one rectification zone combined with at least one nonrectification distillation zone.

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364+, for plural stages of non rectification distillation processes.

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203, Distillation: Processes, Separatory,

71+, for a distillation process including two or more distinct distillation steps.