(under subclass 28) Processes including a step of lowering the temperature of the material treated, usually by refrigeration.
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33+, for processes of separating wax from a mineral oil by means of a solvent which include a chilling step.
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62, Refrigeration, particularly
123+, for processes and apparatus for cooling or chilling paraffin wax-mineral oil mixtures by refrigeration, even though combined with a separation of solidified constituents (wax). Such processes combined with other treatments of the mixture or separated wax or oil, for example, solvent extraction, or distillation are classified in this class (208).
210, Liquid Purification or Separation, 175+, 737, 766, and 774+ for processes and apparatus for liquid separation combined with heating or cooling there provided for.
