Process for recovering onium hydroxides from solutions...

C - Chemistry – Metallurgy – 07 – C

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C07C 209/84 (2006.01) C02F 1/42 (2006.01) B01J 39/04 (2006.01) B01J 49/00 (2006.01) C07C 211/63 (2006.01) G03F 7/004 (2006.01) G03F 7/30 (2006.01)

Patent

CA 2424110

In one embodiment the present invention is a process for recovering an onium hydroxide from a cation exchange material having onium cations adsorbed thereto which comprises (A) contacting said cation exchange material with an aqueous solution of a base selected from alkali metal hydroxides and ammonium hydroxide to form an onium hydroxide, and (B) recovering an aqueous solution of the onium hydroxide. In another embodiment, the present invention relates to a process for recovering an onium hydroxide from a solution containing an onium compound such as an onium hydroxide and/or onium salt, including contacting the solution with a cation exchange material so that at least a portion of onium cations from the onium compound are adsorbed by the cation exchange material; contacting the cation exchange material having the onium cations adsorbed thereto with an aqueous solution of an inorganic base to form an onium hydroxide; and recovering the onium hydroxide solution. The onium hydroxides that can be recovered in this manner include quaternary ammonium hydroxides, quaternary phosphonium hydroxides, and tertiary sulfonium hydroxides.

Selon un mode de réalisation de la présente invention, un procédé de récupération d'hydroxyde d'onium à partir d'un matériau d'échange cationique possédant des cations onium adsorbés dedans qui comprend (A) la mise en contact dudit matériau d'échange cationique avec une solution aqueuse d'une base sélectionnée parmi les hydroxydes alcalinométalliques et l'hydroxyde d'ammonium afin de former un hydroxyde d'onium et (B) récupérer une solution aqueuse de l'hydroxyde d'onium. Selon un autre mode de réalisation de la présente invention, un procédé permet de récupérer un hydroxyde d'onium provenant d'une solution contenant un composant onium comme un hydroxyde d'onium et/ou un sel d'onium, incluant la mise en contact de la solution avec un matériau d'échange cationique, de manière à ce que, au moins, une partie des cations onium provenant du composant onium soient adsorbés par le matériau d'échange cationique, la mise en contact du matériau d'échange cationique présentant les cations onium adsorbés dedans avec une solution aqueuse de base inorganique afin de former un hydroxyde d'onium et de récupérer la solution d'hydroxyde d'onium. Les hydroxydes d'onium pouvant être récupérés ainsi comprennent des hydroxydes d'ammonium quaternaires, des hydroxydes de phosphonium quaternaires et enfin des hydroxydes de sulfonium tertiaires.

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