US PATENT SUBCLASS 585 / 812
.~ By cooling of liquid to obtain solid, e.g., crystallization, etc.

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

800  DF  PURIFICATION, SEPARATION, OR RECOVERY {7}
812.~ By cooling of liquid to obtain solid, e.g., crystallization, etc. {4}
813  DF  .~.~> Using specified holding time or specified cooling rate
814  DF  .~.~> With treatment of mother liquor after crystal separation
815  DF  .~.~> With dissolving or plural serial crystallizations
816  DF  .~.~> With addition of extraneous material {1}

DEFINITION

Classification: 585/812

By cooling of liquid to obtain solid, e.g., crystallization, etc.:

(under subclass 800) Subject matter wherein the purification, separation, or recovery process includes lowering the temperature of a liquid mixture, containing a hydrocarbon to be recovered, to cause one or more components of the mixture to solidify.

SEE OR SEARCH CLASS

34, Drying and Gas or Vapor Contact With Solids, for a process of separating liquids from solids or slurries which may result in the formation or recovery of a crystal-line substance.

62, Refrigeration,

532+, for a crystallization process accomplished by chilling which is claimed as being applicable to more than only hydrocarbon separation or purification.

117, Single-Crystal, Oriented-Crystal, and Epitaxy Growth Processes; Non-Coating Apparatus Therefor, for processes for growing therein-defined single-crystal of all types of materials, including inorganic or organic. See the Class 117 definition for guidance in placement of single-crystal related art.

159, Concentrating Evaporators, for a process which may include formation of crystals from a liquid suspension or solution by removal of a solvent liquid.