US PATENT SUBCLASS 208 / 313
.~.~ Extractive distillation

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

308  DF  FRACTIONATION {5}
311  DF  .~ Liquid extraction with solvents {11}
313.~.~ Extractive distillation

DEFINITION

Classification: 208/313

(under subclass 311) Processes wherein mineral oil is distilled in the presence of a solvent.

SEE OR SEARCH CLASS

203, Distillation: Processes, Separatory,

50+, for a separatory distillation process including adding a material to alter the relative volatility of the components of a mixture.