US PATENT SUBCLASS 585 / 250
ADDING HYDROGEN TO UNSATURATED BOND OF HYDROCARBON, I.E., HYDROGENATION

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

250ADDING HYDROGEN TO UNSATURATED BOND OF HYDROCARBON, I.E., HYDROGENATION {10}
251  DF  .~> With subsequent diverse conversion {2}
254  DF  .~> With preliminary diverse conversion {2}
257  DF  .~> By hydrogen transfer from other hydrocarbon
258  DF  .~> Hydrocarbon is contaminant in desired hydrocarbon {1}
263  DF  .~> With temperature or concentration gradient in reactor or specified provision for heating, cooling, or reactor control
264  DF  .~> With preliminary treatment of feed or plural separation procedures
265  DF  .~> Plural hydrogenation stages
266  DF  .~> Hydrocarbon is aromatic {3}
271  DF  .~> Partial {2}
275  DF  .~> Using transition metal-containing catalyst {2}

DEFINITION

Classification: 585/250

ADDING HYDROGEN TO UNSATURATED BOND OF HYDROCARBON, I.E., HYDROGENATION:

(under the class definition) Subject matter where elemental hydrogen is included or produced in a reaction and the hydrogen causes an unsaturated bond of a hydrocarbon to become less unsaturated.

(1) Note. The starting unsaturated bond may be olefinic, acetylenic, or aromatic.

(2) Note. Hydrogen exchange disproportionation is included herein where the more saturated hydrocarbon product is a desired product of the process. See subclass 257.

(3) Note. Since a process classified herein requires the unsaturated bond of a feedstock to become more saturated, the synthesis of a one carbon atom product, e.g., methane or a methylene free radical, is not proper for classification herein.