Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By contact with solid sorbent
Reexamination Certificate
2008-06-30
2010-06-01
Nguyen, Tam M (Department: 1797)
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By contact with solid sorbent
C585S820000, C585S827000
Reexamination Certificate
active
07728187
ABSTRACT:
Adsorbents and methods for the adsorptive separation of meta-xylene from a mixture containing at least one other C8aromatic hydrocarbon (e.g., a mixture of ortho-xylene, meta-xylene, para-xylene, and ethylbenzene) are described. Suitable adsorbents comprise sodium zeolite Y having an average crystallite size from about 50 to about 700 nanometers. The adsorbents provide improved separation efficiency, which may be associated with a higher meta-xylene mass transfer rate and/or other beneficial effects. Exemplary desorbents for use in the process may comprise toluene, benzene, or indan.
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Frey Stanley J.
Knight Lisa M.
Kulprathipanja Santi
Willis Richard R
Nguyen Tam M
Piasecki David J
UOP LLC
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