Stills heated by fluids carried in or through or around them, in coils, pipes, or jackets, or in superficial contact, the fluids being held from contact with the distilland.
SEE OR SEARCH CLASS
201, Distillation: Processes, Thermolytic,
14+, for a process directed to thermolytic distillation in which a conversion product is used as an indirect source of heat.
203, Distillation: Processes, Separatory,
25+, and 27 for a process in which the vaporization zone is indirectly heated by a product of the process.
