(under subclass 28) Processes in which the product which is recycled is a volatile.
SEE OR SEARCH CLASS
196, Mineral Oils: Apparatus,
99, for mineral oil distilling apparatus including the combination of a vaporizer, condensing means with means for returning a part or all of the condensate to the vaporizer.
202, Distillation: Apparatus,
109, for apparatus for moving the volatile matter distilled off in a closed circuit through the retort.
