Gas Flow Measurement within Polypropylene Production Polypropylene is eiher produced in gas phase processes (fluidized bed or stirred reactor) or liquid phase processes (slurry or solution). One of the liquid phase processes is the so called “Spheripol / Spherizone" process. Gas flow measurements of propylene (but also ethylene and hydrogen) are crucial on many points within this process, but especially at the MZCR (Multi Zone Circulating Reactor), the GPR (Gas Phase Reactor) and the dryer blower discharge lines. Conventionally used differential pressure gas flow meters often face accuracy problems due fouling (as of the presences of fines in the gas streams) at such measurement points. Thus, major process licensors are strongly recommending the use of ultrasonic clamp-on gas flow meters a

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