Process for co-producing para-xylene and metaxylene,...

Details Process for co-producing para-xylene and metaxylene,... Process for co-producing para-xylene and metaxylene,...

2005-01-04

2005-01-04

Dang, Thuan Dinh (Department: 1764)

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By contact with solid sorbent

C585S822000, C585S825000, C585S812000

Reexamination Certificate

active

06838588

ABSTRACT:
A process is described for co-producing metaxylene and paraxylene from a hydrocarbon feed comprising two separation steps. The first step of the process is a counter-current simulated moving bed system in a chromatographic column containing at least five zones, comprising injecting the feed and injecting a desorbent and delivering an extract, a raffinate and an intermediate raffinate either continuously or discontinuously. The extract is distilled to obtain a paraxylene with a purity of at least 99.7%. The raffinate, which is richer in metaxylene, is distilled to extract the desorbent and injected into a counter-current simulated moving bed continuously delivering an extract and a raffinate. One of these two streams is enriched in metaxylene. The most metaxylene-rich stream is distilled to obtain metaxylene with a purity of more than 99%.

REFERENCES:
patent: 5284992 (1994-02-01), Hotier et al.
patent: 2782714 (2000-03-01), None

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