Reactor for dehydrogenation of C3-C5 paraffins

The invention relates to the field of petrochemistry, and specifically to paraffin dehydrogenation reactors. A reactor for the dehydrogenation of C3-C5 paraffins with a boiling layer of a fine-grainedcatalyst includes: a vertical cylindrical container; a raw material vapor inlet communicated with a raw material distributor at the bottom of the reactor container; a contact gas outlet; ports for inputting and outputting a circulating catalyst; partitioning grates which have a free cross-section which increases with the height of the reactor and which separate the boiling layer of the catalyst into sections. The reactor is characterized in that a calming grate is installed between a lower partitioning grate and the raw material distributor, the calming grate has a free cross-section which islarger than the free cross-section of the lower partitioning grate and which comprises more than 25% and less than 90% of the cross-section of the container, and the distance from the calming grate to the lower partitioning g