US PATENT SUBCLASS 208 / 221
.~.~.~ With preliminary treatment of feed

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  DF  .~.~ With acids {4}
221.~.~.~ With preliminary treatment of feed

DEFINITION

Classification: 208/221

(under subclass 219) Processes combined with a nonconversion treatment of the mineral oil prior to the acid desulfurization.

SEE OR SEARCH THIS CLASS, SUBCLASS:

220, for processes involving removal of sulfur from oil in plural stages, at least one of which is acid desulfurization.