Patent ID: 6096839
Filing Date: 2000-08-01
Classification: B01J,B05B,C08F

Abstract:
A continuous gas fluidized bed process for the polymerization of an olefin monomer selected from the group consisting of (a) ethylene, (b) propylene, (c) mixtures of ethylene and propylene and (d) one or more other alpha-olefins mixed with (a), (b) or (c), in a fluidized bed reactor comprising passing a gaseous stream containing said olefin monomer through a fluidized bed in a reactor in the presence of a polymerization catalyst under reactive conditions to polymerize at least a portion of said olefin monomer, withdrawing a gaseous stream containing at least some unreacted monomer from said reactor, cooling at least part of the said gaseous stream withdrawn from said reactor to a temperature at which liquid condenses out of the stream, separating at least part of the condensed liquid from the cooled gaseous stream, continuously recycling separated, cooled gas back to the reactor and introducing at least part of the separated liquid directly into the fluidized bed by:(a) pressurizing the liquid;(b) feeding the pressurized liquid to a liquid inlet of an atomizing chamber of a nozzle;(c) preatomizing the liquid using a mechanical device positioned within the liquid inlet;(d) feeding assisting atomizing gas to a gas inlet of the atomizing chamber;(e) atomizing the preatomized liquid in the atomizing chamber using the assisting atomizing gas; and(f) discharging the atomized liquid as a spray directly into the fluidized bed through at least one outlet of the atomizing chamber of the nozzle.