PARTICLE MOTION AND DEFLUIDISATION BY SINTERING IN THE FLUIDISED BED POLYETHYLENE PROCESS

摘要

Positron Emission Particle Tracking (PEPT) has been used for the first time to monitor the motion of polyethylene particles in a scaled polymer reactor of diameter 0.15 m, at pressures up to 17.5 bars and temperatures up to 100℃. The circulation frequency increases strongly with increase in pressure, linked to a change in bubbling behaviour. The sintering kinetics have been investigated, enabling a safe operating window to be determined.