Method and system for light olefin generation with high yields and selectivity

A system for forming an olefin from a hydrocarbon feed stream, the system comprising:

• a reactor configured to receive the hydrocarbon feed stream under reaction conditions with a dehydrogenation catalyst, wherein the reaction conditions generate a high temperature dehydrogenated product, the high temperature dehydrogenated product including at least a portion of the dehydrogenation catalyst;
• a plurality of separation devices configured to separate at least a portion of the dehydrogenation catalyst from the high temperature dehydrogenated product, the plurality of separation devices including a primary separation device and a secondary separation device downstream of and in fluid communication with the primary separation device;
• a quench system configured to combine the high temperature dehydrogenation product with a quench stream to cool the high temperature dehydrogenation product and form an intermediate temperature dehydrogenation product, wherein the quench stream includes a hydrocarbon, and wherein the quench system is configured to combine the high temperature dehydrogenation product with the quench stream within a plenum section of the reactor;
• and
• a heat transfer system configured to cool the intermediate temperature dehydrogenation product to form a cooled dehydrogenation product.