Method and absorbent composition for recovering a gaseous...

B - Operations – Transporting – 01 – D

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B01D 53/14 (2006.01) B01D 53/62 (2006.01) B01D 53/96 (2006.01)

Patent

CA 2685923

A method and apparatus for recovering a gaseous component from an incoming gas stream is described. The incoming gas stream is contacted with a lean aqueous absorbing medium to absorb at least a portion of the gaseous component from the incoming gas stream to form a lean treated gas stream and a rich aqueous absorbing medium. At least a portion of the gaseous component is desorbed from the rich aqueous absorbing medium at a temperature to form an overhead gas stream and a regenerated aqueous absorbing medium. At least a portion of the overhead gas stream is treated to recover a condensate stream. At least a portion of the condensate stream is used to form a heated stream. At least a portion of the heated stream is recycled back to the desorbing step. Novel absorbing medium compositions to recover carbon dioxide and/or hydrogen sulfide are also described.

L'invention concerne un procédé et un appareil pour récupérer un composant gazeux à partir d'un courant de gaz entrant. Le flux de gaz entrant est mis en contact avec un milieu absorbant aqueux pauvre pour absorber au moins une partie du composant gazeux provenant du courant de gaz entrant pour former un courant de gaz traité pauvre et un milieu absorbant aqueux riche. Au moins une partie du composant gazeux est désorbée du milieu absorbant aqueux riche à une température pour former un courant de gaz de tête et un milieu absorbant aqueux régénéré. Au moins une partie du courant de gaz de tête est traitée pour récupérer un courant de condensat. Au moins une partie du courant de condensat est utilisée pour former un courant chauffé. Au moins une partie du courant chauffé est recyclée en retour à l'étape de désorption. L'invention concerne également de nouvelles compositions de milieu absorbant pour récupérer le dioxyde de carbone et/ou le sulfure d'hydrogène.

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