Low energy so2 scrubbing process

B - Operations – Transporting – 01 – D

Patent

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B01D 53/50 (2006.01) B01D 53/14 (2006.01)

Patent

CA 2534879

Sulphur dioxide is removed from gas streams by contacting the gas stream with an absorbing medium containing an amine capable of forming an amine salt, heat stable salt and sulfite. The level of heat stable salt is selected such that during the regeneration process of the sulphur dioxide rich amine, the pH of the absorbing medium is at a selected level or below when the level of sulfite in the absorbing medium has been reduced to a specified value. The amine that absorbs the sulphur dioxide has a pKa less than that of sulfite. If the absorbent includes a diamine, then the spent absorbing medium is regenerated under conditions such that at least one amine group remains in salt form.

Selon l'invention, du dioxyde de soufre est éliminé de flux gazeux par mise en contact du flux de gaz avec un milieu absorbant contenant une amine pouvant former un sel d'amine, un sel thermostable et du sulfite. Le niveau de sel thermostable est sélectionné de telle sorte qu'au cours du procédé de régénération de l'amine riche en dioxyde de soufre, le pH du milieu absorbant soit égal ou inférieur à un niveau sélectionné lorsque le niveau de sulfite dans le milieu absorbant a été réduit à une valeur spécifiée. L'amine qui absorbe le dioxyde de soufre présente un pKa inférieur à celui du sulfite. Si l'absorbant comprend une diamine, alors le milieu absorbant épuisé est régénéré dans des conditions telles qu'au moins un groupe amine reste sous forme de sel.

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