Raffinate line flush in simulated continuous moving bed adsorpti

Details Raffinate line flush in simulated continuous moving bed adsorpti Raffinate line flush in simulated continuous moving bed adsorpti

1998-02-09

1999-06-15

Griffin, Walter D.

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By contact with solid sorbent

585821, 585822, 585823, 585824, 585826, 585827, 585828, 585829, C07C 712

Patent

active

059123958

ABSTRACT:
The capacity of a simulated moving bed adsorptive separation process is increased by flushing the contents of the transfer line just previously used to remove the raffinate stream from the adsorbent chamber back into the adsorbent chamber. This step is performed immediately upstream of the point of raffinate withdrawal. Preferably the feed stream to the process is used as the flushing liquid. This flush step eliminates the passage of a quantity of the raffinate material into the adsorbent chamber when the process conduit is subsequently used to charge the feed stream to the adsorbent chamber.

REFERENCES:
patent: 3201491 (1965-08-01), Stine et al.
patent: 3686342 (1972-08-01), Neuzil
patent: 4029717 (1977-06-01), Healy et al.
patent: 4031156 (1977-06-01), Geissler et al.
Broughton, D.B., R.W. Neuzil, J.M. Pharis, and C.S. Brearley, "The Parex Process for Recovering Paraxylene," Chemical Engineering Progress (vol. 66, No. 9) Sep. 1970, pp. 70-75.
Broughton, D.B. and S.A. Gembicki, "Adsorptive Separations by Simulated Moving Bed Technology: The Sorbex Process," presented at the International Conference on Fundamental of Adsorption, Schloss Elmau, Upper Bavaria, West Germany, May 6-11, 1983.

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