Supercritical carbon dioxide extraction of contaminants from...

B - Operations – Transporting – 01 – J

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B01J 49/00 (2006.01) C08F 6/00 (2006.01)

Patent

CA 2348521

A method for extracting leachable contaminants from ion exchange resins comprises exposing the resin to supercritical carbon dioxide for a sufficient interval of time to allow at least a portion of the leachable contaminant to be solubilized by the supercritical carbon dioxide; followed by removal from the resin of the supercritical carbon dioxide having the leachable contaminant dissolved therein. The method is particularly useful for removing organic contaminants, which may or may not contain sodium or chlorine, from the resin, to thereby provide ion exchange resins which are suitable for critical use applications in the nuclear, electronics, pharmaceutical and food industries.

la présente invention concerne un procédé permettant d'extraire des impuretés lixiviables de résines échangeuses d'ions, qui consiste à exposer la résine à du dioxyde de carbone supercritique durant un intervalle de temps suffisant pour permettre à au moins une partie des impuretés lixiviables d'être solubilisées par ce dioxyde de carbone supercritique. On retire ensuite la résine du dioxyde de carbone supercritique dans lequel les impuretés lixiviables sont dissoutes. Ce procédé convient particulièrement pour retirer de la résine les impuretés organiques, qui peuvent ou non contenir du sodium ou du chlore, produisant ainsi des résines echangeuses d'ions qui conviennent à des applications d'utilisation critique dans les industries nucléaire, pharmaceutique, électronique et alimentaire.

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