US PATENT SUBCLASS 208 / 272
.~.~.~.~ Fractionation

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

177  DF  REFINING {23}
265  DF  .~ With acids {4}
266  DF  .~.~ Sulfuric acid {7}
271  DF  .~.~.~ With preliminary treatment of the oil {1}
272.~.~.~.~ Fractionation

DEFINITION

Classification: 208/272

(under subclass 271) Processes wherein the mineral oil is subjected to a fractionation prior to sulfuric acid refining.

(1) Note. The fractionation may be carried out by distillation, solvent extraction, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

269, for processes including preliminary fractionation combined with reblending, known as "split feed" treatments.