US PATENT SUBCLASS 203 / 21
AND RECOVERING HEAT BY INDIRECT HEAT EXCHANGE

Current as of: June, 1999
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203 /   HD   DISTILLATION: PROCESSES, SEPARATORY

21AND RECOVERING HEAT BY INDIRECT HEAT EXCHANGE {3}
22  DF  .~> Utilizing recovered heat for heating feed {2}
25  DF  .~> Utilizing recovered heat for heating the distillation zone {1}
27  DF  .~> Utilizing recovered heat in subsequent step in process

DEFINITION

Classification: 203/21

(under the class definition) Processes directed to recovering waste heat by indirect heat exchange with (1) a disparate source or (2) a product of a distillation step.

(1) Note. Heat generated by an engine which runs a compressor used in the process is a disparate source of "waste heat" within the scope of this and indented subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

100, for a digest of distillation processes directed to specific type of heating.

SEE OR SEARCH CLASS

34, Drying and Gas or Vapor Contact With Solids,

427, and 513 for a process including conserving heat by indirect heat exchange. 62, Refrigeration,

96, for a process in which heat from a gas being cooled is transferred to a heat absorber by indirect heat exchange, and subclass 113 for a process of refrigeration in which one function is in heat exchange relation with a second function.

165, Heat Exchange, appropriate subclasses for heat exchange apparatus and note Search Class under Class definition for related fields of search.

196, Mineral Oils: Apparatus,

134, for apparatus for vaporizing mineral oils including means for heat recovery from the vapor or residuum.

202, Distillation: Apparatus,

146, for a horizontal retort with flues wherein the air and/or gas for combustion is heated by the waste products of combustion by means of a single-surface heater and subclass 150 for a similar apparatus using a double-surface heater.

208, Mineral Oils: Processes and Products,

365, for a process wherein the mineral oil distilland is heated by indirect contact with a heated product of the distillation.

237, Heating Systems, appropriate subclass for a heating system which may use the heat rejecting portion of a refrigeration system with additional heating means.

261, Gas and Liquid Contact Apparatus, 158+, for apparatus for indirect interchange of heat between contact fluids.