US PATENT SUBCLASS 208 / 219
.~.~ With acids

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

177  DF  REFINING {23}
208 R  DF  .~ Sulfur removal (free or combined sulfur) {17}
219.~.~ With acids {4}
220  DF  .~.~.~> Plural stages of sulfur removal
221  DF  .~.~.~> With preliminary treatment of feed
222  DF  .~.~.~> With subsequent treatment of product
223  DF  .~.~.~> Inorganic acid {2}

DEFINITION

Classification: 208/219

(under subclass 208) Processes wherein sulfur is removed from mineral oil by the use of an acid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

90, for processes including acid refining of mineral oils combined with chemical conversion of the refined oil.

98, for processes of converting mineral oils followed by refining the converted products with acid.

252, for processes of removing metal contaminants from mineral oils with acids.

256, for processes of removing gums or gum formers from mineral oils with acids.

265+, for other processes of refining of mineral oils with acids.