US PATENT SUBCLASS 202 / 158
.~.~.~ Column

Current as of: June, 1999
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202 /   HD   DISTILLATION: APPARATUS

81  DF  APPARATUS {4}
82  DF  .~ Systems {6}
152  DF  .~.~ Separatory {3}
158.~.~.~ Column {4}
159  DF  .~.~.~.~> With preheater
160  DF  .~.~.~.~> Automatic temperature and/or pressure control
161  DF  .~.~.~.~> Partial reflux condenser
162  DF  .~.~.~.~> Vapor-element by-pass

DEFINITION

Classification: 202/158

A system of separatory distillation apparatus comprising a device arranged to conduct a liquid and a vapor derived therefrom by distillation in counter-current direct contact. At any plane in the column the liquid has a greater concentration of low-boiling substances and the vapor of high-boiling ones than that necessary to maintain equilibrium as to these substances between the vapor and liquid passing that plane, whereby the liquid becomes progressively richer as to high-boiling substances and the vapor as to low-boiling ones. The column, per se, is a gas and liquid contact apparatus and is only classed herein when heating and/or cooling elements are recited in the claims.

SEE OR SEARCH CLASS

196, Mineral Oils: Apparatus,

100, 105 and 139.

261, Gas and Liquid Contact Apparatus,

75+, for specific contact elements or structures, and subclass 148 for columns with heating or cooling means for the trays.