Patent ID: 6461573
Filing Date: 2002-10-08
Classification: B01J,C08F,Y10S

Abstract:
A fluidized bed polymerization apparatus comprising:(a) a fluidized bed polymerization vessel having a fluidized bed for polymerization of olefin as solids catalytic ingredient and polymer are fluidized by introducing olefin-containing fluid gas; (b) a gas-circulating equipment for returning unreacted olefin-containing gas, which is streaming out from the top of said fluidized bed polymerization vessel, to the same polymerization vessel as well as controlling a circulating speed of said unreacted olefin-containing gas; (c) a raw-material-feeding equipment for feeding fresh olefin to said fluidized bed polymerization vessel as well as controlling the feed of olefin; (d) a catalyst-feeding equipment for feeding said solid catalyst into said fluidized bed polymerization vessel as well as controlling the feed of the catalyst; (e) temperature measuring devices for measuring temperature, or temperature distribution, which are installed on the external wall surface of said fluidized bed polymerization vessel and arranged at plural different positions away from each other longitudinally and laterally, wherein at least one of the temperature measuring devices is installed on the external wall surface of said fluidizing bed polymerization vessel and formed on the polymerization vessel to produce no protrusion on the inner wall surface of the vessel; and (f) a controlling means for controlling polymerization conditions depending on the measurement by using the temperature measuring device.