US PATENT SUBCLASS 203 / 71
PLURAL DISTILLATIONS PERFORMED ON SAME MATERIAL

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

71PLURAL DISTILLATIONS PERFORMED ON SAME MATERIAL {5}
72  DF  .~> One a filming distillation
73  DF  .~> One a distillation under positive pressure or vacuum {4}
81  DF  .~> Distillation of initial distillate {2}
84  DF  .~> And returning distillation product to a previous distillation zone
85  DF  .~> Including the addition of water or steam

DEFINITION

Classification: 203/71

(under the class definition) Processes directed to utilizing at least two distilling operations to separate components present in the original mixture.

(1) Note. The second distilling operation may be performed on all or a part of a distillate, a side stream or a residue from the initial distilling operation.

(2) Note. For purposes of this and indented subclasses an operation is considered to be a plural operation if (a) a part of a distilland is removed by distillation and the residue in the still is further distilled under a different pressure or with the addition or absence of water or steam and (b) two or more distillation systems are used regardless as to whether there is an intermediate condensation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

21+, for a plural distillation process in which useful heat is recovered by indirect heat exchange.

43, for a plural distillation process in which a residue of a distillation operation is extracted with a liquid.

44+, for a plural distillation process in which a distillate of a distillation operation is extracted with a liquid. SEE OR SEARCH CLASS

23, Chemistry: Physical Processes,

306, for a process of concentrating a solution of a liquid in a liquid not otherwise provided for.

159, Concentrating Evaporators,

47.1+, for a process of concentrating a liquid, and see "SEARCH CLASS" thereunder for related fields of search.

196, Mineral Oils: Apparatus,

105+, for a plurality of interconnected mineral oil

vaporizers.

202, Distillation: Apparatus,

154, and 155 for separatory distillation apparatus having plural columns and/or plural stills and subclass 173 for a plurality of stills so connected that either the vapor or the residue of one flows into the other.

208, Mineral Oils: Processes and Products,

354+, and 364+ for a process of distilling mineral oil wherein the vaporization is carried out in a plurality of separate and distinct operations.