Process and device for separation with variable-length

Details Process and device for separation with variable-length Process and device for separation with variable-length

1998-12-10

2000-10-24

Therkorn, Ernest G.

Liquid purification or separation

Processes

Chromatography

2101982, B01D 1508

Patent

active

061361984

ABSTRACT:
A process for separating at least one component of a mixture in a set of closed-loop chromatographic columns is described, whereby the loop comprises at least one feedstock injection point, a raffinate draw-off point, an eluant injection point, and an extract draw-off point, in which a determination is made between an injection point and a draw-off point or vice-versa a chromatographic zone, and at the end of a given period of time, all of the injection and draw-off points are shifted by one column or column section in a given direction that is defined relative to that of the flow of a main fluid that circulates through the loop. During the period, the shifting of different injection and draw-off points of a column or column section is done at different times in such a way that the lengths of the zones that are defined by said different points are variable. The process is useful for the seperation particularly of stereoisumers for pharmaceuticals.

REFERENCES:
patent: 4498991 (1985-02-01), Oroskar
patent: 5093004 (1992-03-01), Hotier
patent: 5578215 (1996-11-01), Hotier et al.
Nicoud et al., "Choice and Optimization of Operating Mode in Industrial Chromatography", Proceedings of the 9th International Symposium on Preparative and Industrial Chromatography PREP '92--Apr. 1992--Nancy. pp. 205-221.
Charton et al., "Complete design of a simulated moving bed", J. Chromatogr. A 702, (1995) pp. 97-112.

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