| CPC C07C 5/325 (2013.01) [C07C 7/005 (2013.01); C07C 2521/02 (2013.01); C07C 2521/04 (2013.01); C07C 2523/42 (2013.01); C07C 2523/89 (2013.01)] | 20 Claims |
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1. A method for producing olefins using a circulating fluidized bed process, the method comprising:
a step (a) of supplying a propane-containing hydrocarbon mixture and a dehydrogenation catalyst into a riser, which is a fast fluidization regime, to cause a dehydrogenation reaction;
a step (b) of separating, from a propylene mixture, the catalyst which is a product of the dehydrogenation reaction;
a stripping step (c) of removing unseparated hydrocarbon compounds remaining in the catalyst separated in the step (b);
a step (d) of continuously regenerating the catalyst by mixing the catalyst stripped in the step (c) with a gas containing oxygen;
a step (e) of circulating the catalyst regenerated in the step (d) to the step (a) and resupplying it into the riser; and
a step (f) of preparing propylene by cooling, compressing, and separating the propylene mixture which is a reaction product separated in the step (b),
wherein the dehydrogenation catalyst is one in which active metals including cobalt and platinum are supported on an alumina support modified with boron, and
the fast fluidization regime is a steady state in which the catalyst continuously flows into the riser in a fixed amount while maintaining the gas flow rate within the riser to be higher than the turbulent fluidization regime and lower than the lean phase fluidization with pneumatic transport regime, and is a fluidization regime in which a dense region in the bottom of the riser and a dilute region in the top of the riser are present.
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