Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By contact with solid sorbent
Reexamination Certificate
2005-08-02
2005-08-02
Griffin, Walter D. (Department: 1764)
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By contact with solid sorbent
C585S820000, C585S825000, C585S826000, C585S827000, C585S828000, C585S829000, C585S831000
Reexamination Certificate
active
06924406
ABSTRACT:
A process for separating mixtures of hydrocarbon isomers on molecular sieves, including providing columns which include molecular sieves and function alternatively as secondary adsorption, primary adsorption, and desorption devices, feeding the mixtures of hydrocarbon isomers to a column functioning as the primary adsorption device for adsorbing isomers with greater selectivity towards the molecular sieves, feeding effluent of the mixtures from the column functioning as the primary adsorption device to a column functioning as the secondary adsorption device for adsorbing remaining isomers with greater selectivity, discharging isomers with a lower selectivity from the column functioning as the secondary adsorption device and a desorbing agent therein, feeding a desorbing agent to the column functioning as the desorption device, discharging isomers with a greater selectivity towards the molecular sieves and the desorbing agent in the column functioning as the desorption device.
REFERENCES:
patent: 5863315 (1999-01-01), Jullian et al.
patent: 0 820 972 (1998-01-01), None
patent: 2 773 149 (1999-07-01), None
Bignazzi Renzo
Girardi Gianluca
Paludetto Renato
Pandolfi Gianni
Enichem S.p.A.
Griffin Walter D.
Nguyen Tam M.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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