(under subclass 104) Mineral-oil vaporizers having means for preheating the incoming oil by the heat of the vapors or the unvaporized residue of distillation.
SEE OR SEARCH CLASS
159, Concentrating Evaporators,
24.1, and 46.
165, Heat Exchange,
66, for apparatus for exchanging heat between the supply and exhaust lines of a heated or cooled vessel.
201, Distillation: Processes, Thermolytic, 14, for heating the carbonaceous material by indirect heat exchange with a conversion product of the carbonization step.
202, Distillation: Apparatus,
150, 159 and 177, for distillation apparatus combined with a preheater.
203, Distillation: Processes, Separatory, in which the feed is indirectly heated by recovered heat.
