Patents Examined by Arwn S. Phasge
  • Desalination of aqueous sulphonamide solutions
    Patent number: 6036830
    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.
    Type: Grant
    Filed: October 14, 1998
    Date of Patent: March 14, 2000
    Assignee: Elf Atochem S.A.
    Inventors: Christian Gancet, Didier Lauranson, Frederic Perie