Thermolytic processes as provided for in this class in which the carbonaceous material is subjected to at least two distinctly different temperature stages.
SEE OR SEARCH CLASS
202, Distillation: Apparatus,
150, 159 and 177+ for distillation apparatus including a
preheating device.
203, Distillation: Processes, Separatory,
71+, for plural separatory distillation steps.
208, Mineral Oils: Processes and Products,
49+, 354+ and 364+ for a process directed to heating mineral oil at distinct temperature stages.
