US PATENT SUBCLASS 208 / 271
.~.~.~ With preliminary treatment of the oil

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.~.~.~ With preliminary treatment of the oil {1}
272  DF  .~.~.~.~> Fractionation

DEFINITION

Classification: 208/271

(under subclass 266) Processes combined with a nonconversion treatment of the mineral oil prior to the sulfuric acid refining.

SEE OR SEARCH THIS CLASS, SUBCLASS:

221, for processes of acid desulfurizing a mineral oil combined with a treatment of the oil prior to desulfurizing.

269, for processes of fractionating the oil, sulfuric acid refining at least one fraction and then reblending the fractions ("split treatment").