Device for crystallization by isentropic expansion and its use

Details Device for crystallization by isentropic expansion and its use Device for crystallization by isentropic expansion and its use

1998-06-16

2000-12-19

Kunemund, Robert

Chemistry: physical processes

Physical processes

Crystallization

23307, 4222451, C30B 708

Patent

active

061622621

ABSTRACT:
Device and process for crystallizing a component, e.g. paraxylene, from a mixture that comprises a chamber (1) that has in its upper part means (46) for supplying the mixture, collecting means (20), and in its lower part, crystals of the component in suspension in a mother liquor, connected to means (C) for separation and purification of the crystals that are obtained, means (9) for supplying a cold gaseous fluid and means (22) for drawing off the so-called hot gaseous fluid that results from the direct heat exchange, whereby said device also comprises means for shaping a descending flow of the mixture onto tubes such that the cold gaseous fluid that circulates upward exchanges cold directly with the mixture, whereby means (22) for drawing off the hot gaseous fluid are connected to at least one fluid recompression means (24b), whose output is connected to at least one heat exchanger (27), whereby the heat exchanger is connected to a turbo-expander (30), which is connected to means (31) for supplying cold gaseous fluid.

REFERENCES:
patent: 4124688 (1978-11-01), Shibazaki et al.
patent: 4245998 (1981-01-01), Okouchi et al.
patent: 5401476 (1995-03-01), Hotier et al.
patent: 5435155 (1995-07-01), Paradis
patent: 5558678 (1996-09-01), Weger
patent: 5593496 (1997-01-01), Schranz
patent: 5662870 (1997-09-01), Walsh

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