US PATENT SUBCLASS 208 / 210
.~.~.~ Plural stage treatments with hydrogen

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}
209  DF  .~.~ With hydrogen {4}
210.~.~.~ Plural stage treatments with hydrogen

DEFINITION

Classification: 208/210

(under subclass 209) Processes which include desulfurization of mineral oil in the presence of hydrogen in each of a plurality of steps or stages.