US PATENT SUBCLASS 585 / 483
.~ By dealkylation


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

400  DF  AROMATIC COMPOUND SYNTHESIS {15}
483.~ By dealkylation {2}
484  DF  .~.~> Polycyclic {1}
486  DF  .~.~> Using extraneous agent in reaction zone, e.g., catalyst, etc. {2}


DEFINITION

Classification: 585/483

By dealkylation:

(under subclass 400) Subject matter wherein a side-chain is wholly or partially removed from the ring of an aromatic, e.g., the demethylation of ethylbenzene or xylene to form toluene and/or benzene, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

404+, for a process wherein a ring component at the end of the process has more carbons in the ring or less carbons in the ring than at the start of the process.

470, for a process wherein an alkyl group removed from one hydrocarbon molecule is attached to another molecule, i.e., dealkylation using a hydrocarbon acceptor for the removed alkyl moiety.

476+, for a process wherein a ring of a polycyclic aromatic is opened with or without partial or complete removal of carbon atoms from the resulting side-chain.

800+, for a process wherein an aromatic compound feedstock is purified by cracking the nonaromatic impurities.