A CLCLONE SEPARATOR AND A PROCESS TO SEPARATE CATALYST PARTICLES FROM A GASEOUS PRODUCT LEAYING A FLUID CATALYST CRACKING RISER REACTOR IN A CYCLONE SEPARATOR

摘要

A cyclone separator and a process to separate catalyst particles from a gaseous product leaving a fluid catalyst cracking riser reactor in a cyclone separator The present invention relates to a cyclone separator comprising a vertical housing open at its lower end and provided with a cover at its upper end having a central opening an inlet duct for tangential entry of a mixture of gas and catalyst particles from the outlet of a riser reactor of a fluid-bed catalytic cracking plant, a particles discharge duct communicating with the open lower end of the vertical housing, and a gas outlet duct having a vertical section which extends through the central opening in the cover, which cyclone separator further comprises an open-ended pipe arranged in the central opening so as to define an annular gas inlet conduit between the outer surface of at least part of the vertical section of the gas outlet duct and the inner surface of the open-ended pipe, the cyclone separator being characterized in that it comprises swirl imparting means arranged in the annular gas inlet conduit. The present invention also relates to a process to separate catalyst particles from a gaseous product.