Fluid catalyst cracking (fcc) catalyst and additive loading and control system

Abstract From the Canadian patent

The disclosed method and apparatus provides for providing piecewise continuous addition of microspheroidal ("MS") Fluid Catalytic Cracking ("FCC") catalyst additives and/or bulk catalyst to an in situ circulating, active catalyst inventory of a fluid catalytic cracking unit at programmed rates precisely controlled to sustain effective additive concentration while damping excessive performance fluctuations. In a preferred version of this invention, each of a series of such apparatus comprising one such device for each catalyst additive, is operated on a basic cycle time length during a portion of which the unit is engaged in active addition while in the remainder of the time it is passive, …