US PATENT SUBCLASS 208 / 419
.~ Using specifically added catalyst during hydrogenation

Current as of: June, 1999
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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

400  DF  BY TREATMENT OF SOLID MINERAL, E.G., COAL LIQUEFACTION, ETC. {13}
419.~ Using specifically added catalyst during hydrogenation {3}
420  DF  .~.~> Dissolved or suspended-thermally-decomposable catalyst, component or precursor
421  DF  .~.~> Containing Group VI transition metal {1}
423  DF  .~.~> Containing Group VIII metal

DEFINITION

Classification: 208/419

Using specifically added catalyst during hydrogenation:

(under subclass 400) Subject matter in which the process conditions for hydrogenation include the presence of a material claimed as a catalyst, added to the hydrogenation zone from a source other than the solid feed material.

(1) Note. The presence in the hydrogenation zone of feed-stock derived material such as sand from tar sand, char from pyrolysis, etc., does not indicate classification in this subclass, even when such material is described as having catalytic activity.

SEE OR SEARCH THIS CLASS, SUBCLASS:

405, for a process which uses a molten catalyst.