Production of para-xylene from an effluent from paraselective to

Details Production of para-xylene from an effluent from paraselective to Production of para-xylene from an effluent from paraselective to

1996-09-27

1999-02-02

Caldarola, Glenn

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By alkyl or aryl transfer between molecules, e.g.,...

585805, 585815, 585814, 585828, C07C 713, C07C 714, C07C 522

Patent

active

058667407

ABSTRACT:
Para-xylene is produced from a paraselective toluene disproportionation reactor, effluent is distilled to eliminate toluene and benzene in at least 2 distillation columns, and the xylenes are crystallized at least once at between +10.degree. C. and -30.degree. C. The separated mother liquor is adsorbed on a zeolitic sieve in the presence of toluene in a simulated moving bed. This latter produces a raffinate containing toluene which is depleted in para-xylene which is distilled in a distillation column, and an extract which is enriched in para-xylene and contains toluene, which is recycled. The para-xylene crystals are purified by washing with toluene and distillation or by partial melting followed by washing with molten high purity para-xylene.

REFERENCES:
patent: 3699181 (1972-10-01), Kmecak et al.
patent: 5329060 (1994-07-01), Swift

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