Desalination of aqueous sulphonamide solutions

Details Desalination of aqueous sulphonamide solutions Desalination of aqueous sulphonamide solutions

1998-10-14

2000-03-14

Phasge, Arwn S.

Chemistry: electrical and wave energy

Processes and products

Electrophoresis or electro-osmosis processes and electrolyte...

204530, 204541, B01D 6144

Patent

active

060368306

ABSTRACT:
In order to remove the salts (in particular NH.sub.4 Cl) present in an aqueous sulphonamide solution (in particular CH.sub.3 SO.sub.2 NH.sub.2), the solution is subjected to a two-compartment electrodialysis. By maintaining the pH at a value below 7, the formation of ammonia is avoided. The demineralized solution can be concentrated in order to receover after crystallization, the sulphonamide.

REFERENCES:
patent: 5145569 (1992-09-01), Schneider et al.
patent: 5282939 (1994-02-01), Voss
patent: 5597466 (1997-01-01), Bauer et al.
French Search Report dated Jul. 6, 1998.

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