US PATENT SUBCLASS 208 / 227
.~.~.~ Plural stages of sulfur removal

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}
227.~.~.~ Plural stages of sulfur removal

DEFINITION

Classification: 208/227

(under subclass 226) Processes which include desulfurization of mineral oil in plural stages at least one of which is in the presence of an added alkali or alkaline earth metal compound.