A method for converting heavy olefins present in a product stream exiting a
first reaction zone into light olefins and carbonaceous deposits on a
catalyst without separation of the heavy olefins from the product stream
exiting the first reaction zone. The method comprises creating the product
stream exiting the first reaction zone, the product stream exiting the
first reaction zone comprising the heavy olefins, moving the product
stream exiting the first reaction zone to a second reaction zone without
separation of the heavy olefins from the product stream exiting the first
reaction zone, and contacting the product stream exiting the first
reaction zone with the catalyst under conditions effective to form the
light olefins, the contacting causing the carbonaceous deposits to form on
at least a portion of the catalyst.
