Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By cooling of liquid to obtain solid – e.g. – crystallization,...
Patent
1998-08-12
2000-05-09
Griffin, Walter D.
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By cooling of liquid to obtain solid, e.g., crystallization,...
585828, 585812, 585805, 585470, C07C 700, C07C 714, C07C 712, C07C 522
Patent
active
060606347
ABSTRACT:
Para-xylene is produced from a paraselective toluene disproportionation reactor, effluent (3) is distilled to eliminate toluene and benzene in at least 2 distillation columns (C1), (C2), and the xylenes (8) are crystallized at least once (10) at between +10.degree. C. and -30.degree. C. The separated mother liquor (14) is adsorbed on a zeolitic sieve in the presence of toluene in a simulated moving bed (15). This latter produces a raffinate (16) containing toluene which is depleted in para-xylene which is distilled in a distillation column (C4), and an extract which is enriched in para-xylene and contains toluene, which is recycled to columns (C1, C2). The para-xylene crystals are purified by washing with toluene and distillation or by partial melting (30) followed by washing with molten high purity para-xylene.
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Hotier Gerard
Mikitenko Paul
Dang Thuan D.
Griffin Walter D.
Institut Francais du Pe'trole
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