US PATENT SUBCLASS 585 / 439-- .~.~ By C removal, e.g., cracking, etc.

US PATENT SUBCLASS 585 / 439
.~.~ By C removal, e.g., cracking, etc.

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

400	DF	AROMATIC COMPOUND SYNTHESIS {15}
435	DF	.~ Having alkenyl moiety, e.g., styrene, etc. {4}
439		.~.~ By C removal, e.g., cracking, etc.

DEFINITION

Classification: 585/439

By C removal, e.g., cracking, etc.:

(under subclass 435) Subject matter in which carbon atoms are removed from a feedstock compound.

(1) Note. The removed carbon atoms are not thereupon joined to a second hydrocarbyl moiety to increase the carbon content of the second moiety.

SEE OR SEARCH THIS CLASS, SUBCLASS:

241, for depolymerization of aromatic-containing synthetic resin waste.

435, for production of an alkenyl aromatic by disproportionation, i.e., transalkylation.

476, and 483+, for similar processes wherein the aromatic product does not have an unsaturated nonring moiety.