2170 kpa abs total the precharge of granular polymer in the polymerizer was stirred mechanically at 200 rpm the polymerizer gases were recirculated gently through the cooling loop so that only fines were carried over into the cyclone gas flow and granular polymer circulation were next established in the seed generator 35 the atmosphere in the seed generator was controlled by pumping in a mix 20 mole percent of tetrafluoroethylene and 80 mole percent of nitrogen at 30 4 cc hr measured at 1015 psia 6990 kpa abs and 25 u00b0 c via port 8 see fig polymer was circulated through the seed generator using a single screw feeder performing the functions of conveyor screws 23 and 25 to pull polymer from the base of the polymerizer via stripping section 21 and return the polymer to the gas recycle loop via initiation section 26 freon u00ae 113 was introduced at 5 to 8 cc hr at the top of the polymerizer via port 4 see fig the introduction of freon u00ae 113 was found helpful in maintaining a granular product finally 0 3 m perfluoropropionyl peroxide in freon u00ae 113 was injected into the seed generator via port 9 at 1 0 cc hr as the mix was fed to the initiator section an exotherm was observed in initiation section 26 this exotherm was controlled by adjusting the turning rate of the screw feeder reaction was continued for a total of 49 5 minutes additional tetrafluoroethylene was added as needed to maintain total pressure from 285 psia 1960 kpa abs to 318 psia 2190 kpa abs temperatures within the polymerizer were kept between 54 and.