Closed reactor fcc system with provisions for surge capacity

Abstract From the Canadian patent

The present invention involves a fluid catalytic cracking (FCC) apparatus and process comprising a reactor riser zone a primary and a, secondary cyclones, connected in series to the riser zone and a, stripping zone. The riser zone, the primary and the secondary cyclones and the stripping zone, are placed within a single reactor vessel. The primary cyclone is connected to the reactor riser zone by an enclosed conduit which prevents random post-riser thermal cracking of the hydrocarbons after they exit the reactor riser zone. The conduit contains a trickle valve, or other means to accommodate sudden increased, surges of flow of the hydrocarbons and catalyst mixture.