US PATENT SUBCLASS 208 / 266
.~.~ Sulfuric acid

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.~.~ Sulfuric acid {7}
267  DF  .~.~.~> With fluid rotation or agitation
268  DF  .~.~.~> White oil making
269  DF  .~.~.~> Split treatment
270  DF  .~.~.~> Plural stages of acid treatment
271  DF  .~.~.~> With preliminary treatment of the oil {1}
273  DF  .~.~.~> With subsequent treatment of the oil {2}
276  DF  .~.~.~> With nonwater additive {2}

DEFINITION

Classification: 208/266

(under subclass 265) Processes wherein sulfuric acid is employed.

(1) Note. Sulfuric acid treatment of mineral oils results in oils of improved odor, color, color stability, stability to heat and oxidation and resistance to sludge formation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

224, for processes of desulfurizing mineral oil with sulfuric acid.