(under the class definition) Processes directed to condensing the vapor evolved during the distillation step in a plurality of fractions.
(1) Note. To come within the purview of this subclass a mixed vapor must be produced which is separated into parts by cooling the vapor in a plurality of distinct stages.
SEE OR SEARCH CLASS
201, Distillation: Processes, Thermolytic,
30, for a thermolytic distillation process in which the evolved vapors are condensed in a plurality of distinct stages.
202, Distillation: Apparatus,
199, for apparatus in which vapor is passed through a condensate from itself to surrender high boiling constituents. 208, Mineral Oils: Processes and Products,
342, for a process including fractionally condensing a mineral oil containing vapor mixture.
