US PATENT SUBCLASS 585 / 265
.~ Plural hydrogenation stages

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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

250  DF  ADDING HYDROGEN TO UNSATURATED BOND OF HYDROCARBON, I.E., HYDROGENATION {10}
265.~ Plural hydrogenation stages

DEFINITION

Classification: 585/265

Plural hydrogenation stages:

(under subclass 250) Subject matter wherein an effluent material from a hydrogenation reaction is hydrogenated, e.g., passage of the feed through a stage having a certain catalyst activity, and a subsequent state having a different activity, etc.