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Fluidized bed reactor

  • US 4,003,712 A
  • Filed: 03/14/1975
  • Issued: 01/18/1977
  • Est. Priority Date: 07/29/1970
  • Status: Expired due to Term
First Claim
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1. A fluid bed reactor system in which olefin monomers may be catalytically polymerized continuously in a fluid bed under gas medium fluidized conditions, and comprisinga vertical reactor having a cylindrical lower section and an upper section have a cross section greater than that of said lower section, said lower section being adapted to house a polymerization zone in which the catalyzed polymerization reaction may be conducted under gas medium fluidized fluid bed conditions, and said upper section being adapted to function as a velocity reduction zone for the recovery of particles entrained in fluidizing medium entering said upper section from said lower section, fluidizing medium permeable distribution plate means within and towards the base of said lower section, said distribution plate means being adapted to diffuse fluidizing medium up through the fluidized bed in said lower section and to support said bed thereon when said bed is quiescent,fluidizing medium supply line means in gas communication with, and adapted to supply fluidizing medium and make up gas to, the lower section of said reactor and below said distribution plate means,catalyst injection means in catalyst supply communication with, and adapted to supply particulate olefin polymerization catalyst to, the side of the fluidized bed in the polymerization zone in said lower section,polymer product recovery means in polymer product recovery communication with, and adapted to recover polymer product from, the base of said polymerization zone and above said distribution plate means,said polymer product recovery means comprising a valved chamber which is adapted to recover polymer product from said reactor at a rate equal to the rate of polymer product formation with the aid of a pressure differential between the pressure within said reactor and the pressure within said chamber,fluidizing medium recycle line means in gas communication with said reactor and adapted to recover fluidizing medium from the upper section of said reactor and to recycle the thus recovered fluidizing medium to the lower section of said reactor at a point below said distribution plate means,heat exchange means within said recycle line means adapted to remove heat of reaction from the recycled fluidizing medium,gas analyzer means in gas communication with said velocity reduction zone and adapted to analyze gas component deficiency in the fluidizing medium in sad velocity reduction zone, andsaid fluidizing medium supply line means being in gas communication with said recycle line means and in gas supply activating response communication with said gas analyzer means and adapted to supply deficient components of the fluidizable medium to said recycle line means in response to gas supply activating communication from said gas analyzer means.

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