Process for the regeneration of used silica gel

Details Process for the regeneration of used silica gel Process for the regeneration of used silica gel

C - Chemistry, Metallurgy

01

B

C01B 33/12 (2006.01) B01D 15/20 (2006.01) B01J 21/20 (2006.01) B01J 38/02 (2006.01) B01J 38/50 (2006.01) B01J 38/60 (2006.01) B01J 38/70 (2006.01)

Patent

CA 2369409

The present invention is concerned a process for the regeneration of the spent silica gel used in chromatography and for any other kind of silica. The process comprises 5 main steps, namely: washing with an extractant of organic compounds and removing volatile organic materials remaining thereafter; oxidation to oxidize organic compounds remaining and, preferably, bleach the material; washing with an acid to remove soluble inorganic matter; heating to dry the material and combust any remaining organic compounds present; and recovering the regenerated material. Various optional steps can be added to the process.

L'invention concerne un procédé de recyclage de gel de silice usagé utilisé en chromatographie, applicable à tout autre type de silice, qui comprend les cinq étapes principales suivantes: lavage des composés organiques avec un agent d'extraction et élimination des matériaux organiques volatils subsistants; oxydation visant à oxyder les composés organiques restants et, de préférence, blanchiment du matériau; lavage avec un acide pour éliminer les matières inorganiques solubles; chauffage pour sécher le matériau et brûler tout composé organique restant; et enfin récupération du matériau recyclé. On peut ajouter différentes étapes facultatives au procédé.

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