Process for co-production of paraxylene, metaxylene and/or...

Details Process for co-production of paraxylene, metaxylene and/or... Process for co-production of paraxylene, metaxylene and/or...

2005-01-11

2005-01-11

Dang, Thuan Dinh (Department: 1764)

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By contact with solid sorbent

C585S822000, C585S825000, C585S812000

Reexamination Certificate

active

06841714

ABSTRACT:
A process for co-production of paraxylene, metaxylene and/or orthoxylene from a hydrocarbon feedstock (1) that comprises [1] a separation stage of the feedstock in a simulated moving bed in a chromatographic column (9) that contains a number of beds of an adsorbent, interconnected in a loop, is described, whereby said column comprises an injection (3) of the feedstock, a draw-off (10) of an extract that consists of paraxylene and desorbent, an intermediate fraction (11) (extract or raffinate) that contains ethylbenzene, and a raffinate (12) that contains a mixture of metaxylene and orthoxylene that is virtually free of ethylbenzene and paraxylene and [2] a crystallization stage (27) of the metaxylene and/or orthoxylene fraction. Upstream from the adsorption zone and/or upstream from the crystallization zone, it is possible to distill the entering mixture to produce an orthoxylene-enriched fraction at the bottom and a metaxylene-enriched fraction at the top.

REFERENCES:
patent: 5284992 (1994-02-01), Hotier et al.
patent: 99 64381 (1999-12-01), None

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