Removal of nitrogen oxides from gases

Details Removal of nitrogen oxides from gases Removal of nitrogen oxides from gases

B - Operations, Transporting

01

D

B01D 53/04 (2006.01) B01D 53/56 (2006.01) C07C 7/12 (2006.01) C07C 7/148 (2006.01) C10G 70/04 (2006.01)

Patent

CA 2205739

For selectively removing nitrogen oxides from a carrier gas that contains hydrocarbons, the nitrogen oxides are removed by chemisorption on metal oxides, without the occurrence of undesirable secondary reactions. The metal oxides are preferably formed from metals of the 6th to 8th subgroups, whereby manganese dioxide (MnO2) is especially preferred as a metal oxide. The process can be conducted with one or more reactor beds, which preferably operate at 10 to 40°C and are regenerated with nitrogen at a temperature of 130 to 170°C. By removing nitrogen oxides from an olefin-rich gas, for example from the waste gas of an FCC unit, the resultant gas can then be fed to a cryogenic olefin extraction stage without danger of explosion. Such a waste gas contains unsaturated hydrocarbons, hydrogen, carbon monoxide, and oxygen, the oxygen having a concentration preferably between 100 and 5000 mol ppm.

Pour retirer l'oxyde d'azote d'un gaz porteur contenant des hydrocarbures, on procède par sorption chimique à la surface d'oxydes métalliques, sans causer de réactions secondaires indésirables. Les oxydes métalliques se forment en général à partir de métaux des sixième et huitième sous-groupes, le dioxyde de manganèse (MnO2) étant l'oxyde métallique le plus fréquent. On peut recourir à un ou plusieurs bancs de réaction, de préférence entre 10 et 40 C, régénérés au moyen d'azote à la température de 130 à 170 C. L'élimination des oxydes d'azote d'un gaz à forte teneur en oléfines, comme le gaz résiduaire d'une unité de craquage catalytique fluide (FCC), permet de soumettre le gaz obtenu à l'extraction cryogénique des oléfines sans risque d'explosion. Ce genre de gaz résiduaire contient des hydrocarbures insaturés, de l'hydrogène, du monoxyde de carbone ainsi que de l'oxygène, de préférence selon une concentration de 100 à 5000 mol mg/l.

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