US PATENT SUBCLASS 585 / 808
.~.~.~.~ Agent contains N, carbonyl, or dihydroxy moiety

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

800  DF  PURIFICATION, SEPARATION, OR RECOVERY {7}
802  DF  .~ By plural serial diverse separations {3}
804  DF  .~.~ To recover aromatic {3}
807  DF  .~.~.~ Including steps of distillation and agent addition {1}
808.~.~.~.~ Agent contains N, carbonyl, or dihydroxy moiety

DEFINITION

Classification: 585/808

Agent contains N, carbonyl, or dihydroxy moiety:

(under subclass 807) Subject matter in which the agent added in a purification step contains nitrogen or the keto -C--C moiety or the aldehyde -C=O moiety or has two hydroxyl groups.