US PATENT SUBCLASS 208 / 211
.~.~.~ 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}
209  DF  .~.~ With hydrogen {4}
211.~.~.~ With preliminary treatment of feed

DEFINITION

Classification: 208/211

(under subclass 209) Processes combined with a nonconversion treatment of the mineral oil prior to the hydrodesulfurization treatment.

(1) Note. The preliminary treatment may, for example, include removal of sulfur (other than by using hydrogen) or other type of refining.