(under subclass 14) Processes directed to indirectly heating the carbonaceous charge, at least in part, by the burning of at least a part of a product of the thermolytic distillation operation.
(1) Note. When the cracking of a vapor product is for the production of heat to assist the thermolytic process and not primarily to produce a mineral oil, the process is classified in Class 201 instead of Class 208.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids,
513, for a process including conserving heat by burning the discharged vapors and using the evolved heat.
202, Distillation: Apparatus, 111, 122, 123, 130, 132, 140, 141+, 146, and 148 for retort system heated by the heat carried off by the products of combustion.
