(under the class definition) Processes directed to passing through the material being distilled a normally gaseous substance.
(1) Note. A substance to be considered "normally gaseous" must have a boiling point below - 10oC at atmospheric pressure. Air, ammonia, carbon dioxide, dimethyl ether and propane are some examples of "normally gaseous" substances.
SEE OR SEARCH CLASS
23, Chemistry: Physical Processes,
307, for a process of concentrating a solution of a liquid in a liquid in which the liquid being concentrated is directly contacted with the concentrating medium (e.g., hot gases).
95, Gas Separation: Processes,
263+, for degasification of a liquid by stripping with a gas. 202, Distillation: Apparatus,
134, for a retort having provision for injecting a fluid for convective separation of the distillate.
208, Mineral Oils: Processes and Products,
356, and 362 for a process of distilling mineral oil in the presence of an added gas or vapor, and subclass 43 for a process of contacting tar with high temperature gas during distillation.
261, Gas and Liquid Contact Apparatus, appropriate subclasses for apparatus adapted to produce an intimate contact between gases and liquids, particularly
121+, for devices for discharging gases beneath the surface of a liquid.
