.~> And returning product of distillation step to distillation zone
DEFINITION
Classification: 203/91
(under the class definition) Processes in which distillation is carried out under a pressure greater than atmospheric or under a vacuum.
(1) Note. The use of pressure varying from atmospheric changes the relative volatility of the components of the distilland thereby altering the composition of the vapor evolved.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids,
402+, for a process of drying a solid involving the
application of a vacuum.
196, Mineral Oils: Apparatus, 114, for mineral oil vaporizing apparatus operated under vacuum.
201, Distillation: Processes, Thermolytic,
35, for a process of applying differential pneumatic pressure to the thermolytic conversion zone.
202, Distillation: Apparatus,
205, for separatory distillation apparatus provided with means for producing a vacuum therein and see "SEARCH CLASS" thereunder for related fields of search.
208, Mineral Oils: Processes and Products,
357, and 366 for a process of distilling mineral oil in which the vaporization zone is under a pressure greater or less than atmospheric pressure and see "SEARCH CLASS" under subclass 357 for related fields of search.
588, Hazardous or Toxic Waste Destruction or Containment, appropriate subclasses for the use of heat or vacuum in the destruction of hazardous or toxic waste.
