Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By contact with solid sorbent
Patent
1995-09-20
1998-04-28
Caldarola, Glenn
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By contact with solid sorbent
585804, 585805, 585448, 585518, 585717, 208254R, 208299, 208300, 4232392, C07C 712, C07C 700, C25D 334
Patent
active
057446865
ABSTRACT:
This invention relates to a process for the removal of nitrogen compounds from an aromatic hydrocarbon stream comprising the nitrogen compounds by contacting the hydrocarbon stream with a selective adsorbent having an average pore size less than. about 5.5 Angstroms. The selective adsorbent is a molecular sieve selected from the group consisting of pore closed zeolite 4A, zeolite 4A, zeolite 5A, silicalite, F-silicalite, ZSM-5 and mixtures thereof. In one embodiment, the present invention comprises a combination of a fractionation zone and an adsorption zone wherein the feedstream is passed to the fractionation zone to provide a dry bottoms product stream essentially free of the nitrogen compounds and an overhead stream. The overhead stream is condensed to provide an aqueous stream and a hydrocarbon stream. The hydrocarbon stream is passed to an adsorption zone and a treated effluent recovered therefrom is returned to the fractionation zone. The invention provides significant cost advantages when the feedstream is subject to slugs or surges in levels of nitrogen compounds which can be detrimental to downstream catalyst as found in aromatic conversion reactions.
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Bullock In Suk
Caldarola Glenn
McBride Thomas K.
Silverman Richard P.
Tolomei John G.
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