Fluidized catalyst circulation reactor for paraffin oxydative dehydrogenation

A process for oxidative dehydrogenation of dehydrogenatable hydrocarbons comprising:

• introducing a feed and an oxidative dehydrogenation catalyst into an inlet at a bottom of a fluidized riser reactor at a linear velocity greater than about 1 m/sec, the feed comprising the hydrocarbons, the riser reactor having a plurality of oxygen injection ports located between the bottom and the top of the riser reactor, the plurality of oxygen injection ports dividing the riser reactor into a plurality of segments, wherein the oxidative dehydrogenation catalyst comprises a first component selected from the group consisting of Group VIII metal components and mixtures thereof supported on a support, and wherein the catalyst particles ranges from about 20 μm to about 200 μm;
• contacting the hydrocarbons and the catalyst in the riser reactor under dehydrogenation conditions to dehydrogenate the hydrocarbons to form olefins and hydrogen;
• introducing an oxygen-containing gas into the plurality of injection ports to oxidize a portion of the hydrogen formed from the dehydrogenation reaction in the segment, an amount of oxygen-containing gas being introduced into each injection port being no more than an amount sufficient to oxidize about 60% of the hydrogen formed in the segment;
• separating the olefins from the catalyst;
• and
• recovering the olefins.