US PATENT SUBCLASS 208 / 35
.~.~.~ With chilling by evaporation of solvent

Current as of: June, 1999
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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

24  DF  PARAFFIN WAX; TREATMENT OR RECOVERY {4}
28  DF  .~ Separation of paraffin from oil (e.g., dewaxing) {4}
33  DF  .~.~ Solvent dewaxing {3}
35.~.~.~ With chilling by evaporation of solvent

DEFINITION

Classification: 208/35

(under subclass 33) Processes wherein the material is cooled or chilled by the evaporation of the solvent usually causing a precipitation of the separated paraffin wax.

(1) Note. This subclass includes, for example, solvent dewaxing processes wherein the normally gaseous solvents which are used in liquid form are vaporized thereby causing a reduction in temperature and precipitation of paraffin wax.