US PATENT SUBCLASS 208 / 403
.~ Chemical modification of solids before 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}
403.~ Chemical modification of solids before hydrogenation


DEFINITION

Classification: 208/403

Chemical modification of solids before hydrogenation:

(under subclass 400) Subject matter including a hydrogenation step and a step, upstream of the hydrogenation, in which a solid feed to the process undergoes a partial chemical reaction, which does not change the essential nature of the feed; e.g., coal may be deoxgenated or desulfurized, but it is not solublized or converted to coke.

(1) Note. A step of hydrogenation is any chemical conversion step specified as being performed in the presence of free hydrogen or a compound specified as being a hydrogen donor.

(2) Note. Mere removal of chemically nonbound water is not

considered to be a chemical modification for this subclass.

SEE OR SEARCH CLASS

44, Fuel and Related Compositions,

620+, for chemical modification of coal, per se, without liquefaction.