US PATENT SUBCLASS 208 / 228
.~.~.~ 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}
226  DF  .~.~ With alkali or alkali earth metal compound (except clays) {4}
228.~.~.~ With preliminary treatment of feed

DEFINITION

Classification: 208/228

(under subclass 226) Processes combined with a nonconversion treatment of the mineral oil prior to the desulfurization with the alkali or alkaline earth metal compound.

SEE OR SEARCH THIS CLASS, SUBCLASS:

227, for processes including removal of sulfur from oil in a plurality of stages, alkali or alkaline earth metal being employed in one stage.