Process for purifying high-temperature reducing gases

B - Operations – Transporting – 01 – D

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Details

B01D 53/14 (2006.01) B01D 53/48 (2006.01) B01D 53/52 (2006.01) C01B 17/04 (2006.01) C01B 17/50 (2006.01) C10K 1/20 (2006.01)

Patent

CA 2052856

A process for purifying high-temperature reducing gases containing sulfureous contaminants including hydrogen sulfide and carbonyl sulfide with an absorbent, said process characterized in that at least three reactor towers which are filled with an absorbent are used, and said process comprises the three steps of absorption, regeneration, and reduction, and during in a part of operation two reactor towers are connected in series so as to carry out regeneration, and O2 concentration can be controlled separately for each regenerating reactor tower in the regeneration step, and steam can be supplied so as to prevent excessive reduction of the absorbent from occurring in the reduction step. The life of the absorbent can be extended and operational costs may be reduced.

Procédé pour purifier des gaz réducteurs à haute température, renfermant des contaminants sulfureux, notamment le sulfure d'hydrogène et le sulfure de carbonyle, avec un absorbant; le procédé utilise au moins trois colonnes de réaction chargées d'un absorbant, et comprend les trois étapes d'absorption, de régénération et de réduction; pendant une partie de l'opération, deux tours de réaction sont connectées en série pour la régénération; la concentration de O2 peut être contrôlée séparément pour chaque réacteur dans l'étape de régénération; la vapeur peut être injectée de façon à empêcher une réduction excessive d'absorbant dans l'étape de réduction. La durée de vie de l'absorbant peut être prolongée et les coûts d'exploitation peuvent être réduits.

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