US PATENT SUBCLASS 208 / 209
.~.~ 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.~.~ With hydrogen {4}
210  DF  .~.~.~> Plural stage treatments with hydrogen
211  DF  .~.~.~> With preliminary treatment of feed
212  DF  .~.~.~> With subsequent treatment of product
213  DF  .~.~.~> With solid catalyst or absorbent {4}

DEFINITION

Classification: 208/209

(under subclass 208) Processes wherein the mineral oil is desulfurized in the presence of added hydrogen.

(1) Note. The hydrogen may be added as a free gas or a hydrogen rich material may be used under such conditions as to generate or liberate hydrogen (hydrogen donor processes).

SEE OR SEARCH THIS CLASS, SUBCLASS:

58+, and 107+, for hydrocracking processes wherein sulfur may also be removed. Thus, if the hydrodesulfurization is carried out under conditions which will promote chemical conversion of the oil, the process will be classified as a chemical conversion rather than as a refining treatment.

89, for processes of refining mineral oils with added hydrogen combined with a subsequent chemical conversion of the refined oil.