| DefinitionThis class relates to apparatus and processes, which are not more specifically provided for elsewhere, peculiar to the concentration of solids held in solution or suspension, by evaporation of the liquid containing them in solution or suspension, and the recovery of the concentrate. The concentration may be carried to the point of crystallization or to dryness. | Notes (1) Note. Processes involving significant chemical changes are excluded. (2) Note. Machines, processes, and treatments of a specialized character (e.g., heat treatments) directed to the preparation or purification of a particular substance, which are not simply a mode or means of concentrating by evaporation, of general application are excluded. However, processes and apparatus solely for concentrating by evaporation are here even though the particular material concentrated is specified. (3) Note. Evaporating apparatus involving the recovery or treatment of the vapors evolved either as vapors or condensate (e.g., stills) is excluded. This does not exclude the recovery of heat in the vapors. | Lines with other classes and within this class This class is superior to Class 165, Heat Exchange, in that means for the transfer of heat for the specific purpose of concentration by evaporation is found here. This class is superior to Class 122, Liquid Heaters and Vaporizers, in that means for vaporizing liquid for the specific purpose of concentration of attendant solids is found here. This class is superior to Class 261, Gas and Liquid Contact Apparatus, in that means for contacting gas and liquid for the specific purpose of concentration by evaporation is found here. This class is differentiated from Class 34, Drying and Gas or Vapor Contact With Solids, in that the substance under treatment is initially in a liquid or fluent condition. |
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