APPARATUS AND METHOD FOR THE SEPARATION AND STRIPPING OF FLUID CATALYST CRACKING PARTICLES FROM GASEOUS HYDROCARBONS

1. Integrated disengager and stripper (2) for separating solid particles suspended in vapour and for stripping adsorbed and entrained residue from the solid particles comprising: (a) a disengager vessel (3) having a primary fiuidized-bed zone (10) adapted to contain fiuidized solid particles, and a primary means (12) for injecting into the primary fiuidized-bed zone (10) a gas for fluidizing or stripping solid particles; (b) a vertical primary cyclone (6) contained inside the disengager vessel (3), which primary cyclone (5) has a cylindrical side wall (15) and is closed at its upper end by means of a cover (17) provided with an outlet opening (19) and open at its lower end, which primary cyclone (6) is further provided with at least one inlet (24) for receiving a suspension of solid particles and vapour; and (c) a first outlet conduit (30) for providing a flow path from the outlet opening (19) of the primary cyclone, which has an end connected to the outlet opening (19) of the primary cyclone (6), characterized in that the open lower end of the primary cyclone (6) projects downwardly into the primary fiuidized-bed zone (10) so as to form a secondary fiuidized-bed zone (35) within the lower open end (32) of the primary cyclone (6). 2. Integrated disengager and stripper (2) as claimed in Claim 1, further comprising secondary means (41) for injecting into the secondary fiuidized-bed zone (35) a gas for fluidizing or stripping solid particles. 3. Integrated disengager and stripper (2) as claimed in Claim 1 or 2, characterized in that the inlet (24) of the primary cyclone (6) is a tangential inlet (42) arranged in the side wail (15) near the closed end of the primary cyclone (6). 4. Integrated disengager and stripper (2) as claimed in any one of the Claims 1-3, characterized in that part (44) of the first outlet conduit (30) extends into the primary cyclone (6). 5. Integrated disengager and stripper (2) as claimed in any one of the Claims 1-4, characterized in that the primary cyclone (6) further comprises a primary vortex stabilizer (46) coaxially mounted in the middle part of the primary cyclone (6), the outer diameter of the primary vortex stabilizer (46) being equal to or larger than the diameter of the first outlet conduit (30), which primary vortex stabilizer (46) is positioned below the inlet opening (49) of the first outlet conduit (30) at a distance which is equal to or larger than the diameter of the first outlet conduit (30). 6. Integrated disengager