Methods for manufacturing olefins from lower alkanes by...

C - Chemistry – Metallurgy – 07 – C

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C07C 11/02 (2006.01) C07C 2/84 (2006.01) C07C 5/48 (2006.01) C07C 7/152 (2006.01)

Patent

CA 2421816

The present invention provides methods for manufacturing olefins such as ethylene and propylene from lower alkanes, that is, methane, ethane and/or propane, by oxidative dehydrogenation at elevated pressure. The olefins are selectively recovered from unconverted lower alkane feed and reaction byproducts by using a complexation separation, such as an absorption separation that uses aqueous silver nitrate as the complexation agent. Catalysts are used that give high selectivity for oxidative dehydrogenation of lower alkanes to olefins at elevated pressure, such as a nonstoichiometric rare earth oxycarbonate catalyst.

L'invention concerne des procédés relatifs à l'élaboration d'oléfines (par exemple, éthylène et propylène) à partir d'alcanes inférieurs, à savoir, méthane, éthane et/ou propane, par déshydrogénation oxydative effectuée dans des conditions de pression élevée. La récupération des oléfines s'effectue de façon sélective à partir d'une charge d'alcanes inférieurs non convertis et de sous-produits de réaction, par le biais d'une séparation en complexation, du type séparation par absorption, en utilisant du nitrate d'argent sous forme aqueuse comme agent complexant. On fait appel à des catalyseurs qui confèrent une sélectivité élevée au processus de déshydrogénation oxydative des alcanes inférieurs en oléfines, dans des conditions de pression élevée (par exemple, catalyseur à base d'oxycarbonate des terres rares de type non stoechiométrique).

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