Patent ID: 7957947

Claim:
A non-transitory computer readable medium comprising a model for simulating the volatile organic content (VOC) of a polyolefin product stream discharging from a purge column of a polyolefin polymerization system, the model comprising: an interface component configured to provide for input to the model and for output from the model; and an iterative calculation component based on at least mass transfer theory and configured to represent removal of volatile organic components from a polyolefin stream flowing through the purge column, and to provide a calculated value of the VOC in a polyolefin product stream discharging from the purge column; wherein the iterative calculation component comprises instructions for calculating the value of the VOC in the polyolefin product stream based on a flow rate of the polyolefin stream flowing through the purge column and a flow rate of a purge gas flowing through the purge column, the purge gas flowing counter current to the polyolefin stream.