Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By contact with solid sorbent
Patent
1988-09-26
1990-07-10
Caldarola, Glenn
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By contact with solid sorbent
208310Z, C07C 712
Patent
active
049408305
ABSTRACT:
A process for the separation of the para-isomer from a hydrocarbon feed mixture comprising at least two bi-alkyl substituted monocyclic aromatic isomers, including the para-isomer, said isomers having from 8 to about 18 carbon atoms per molecule which process employs an adsorbent comprising a sodium Y zeolite or a sodium Y zeolite which has been at least partially cation exchanged, at appropriate conditions, with an element chosen from Groups IB or VIII of the Periodic Table, such as nickel or copper, to preferentially adsorb the bi-alkyl substituted monocyclic aromatic isomers, in preference to the para-isomer. The para-isomer thereafter is removed from the process via the raffinate stream and the adsorbed isomers are removed from the adsorbent by contact with a desorbent material and are recovered as a product stream. In a preferred embodiment the process uses a simulated moving-bed countercurrent flow system and a paradiethylbenzene desorbent. The preferred application of the present invention would be in the recovery of high purity para-xylene from a feed mixture having a relatively high para-xylene content.
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Fergin Richard L.
Zinnen Hermann A.
Caldarola Glenn
Hall Jack H.
McBride Thomas K.
Spears Jr. John F.
UOP
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