Patent ID: 6327521
Filing Date: 2001-12-04
Classification: B01J,C08G

Abstract:
A method for controlling the variability of the product polymer properties in a polymerization process, the method comprising at least one means for varying at least one process input parameter and a means for venting the gases generated during the polymerization, thereby forming a vent gas stream, the method comprising:diverting at least a portion of the vent gas stream to a compositional analysis means;analyzing the diverted portion of the vent gas stream to determine the variability in concentration of at least one component of the vent gas stream;ascertaining a degree of variability in the rate of loss of the at least one component of the vent gas stream;determining whether the degree of variability so determined exceeds a predetermined amount; and, if the degree of variablity exceeds the predetermined amount,causing the at least one process input parameter to be varied in a manner which has the effect of reducing the degree of variability in the rate of loss of the at least one component of the vent gas stream so that the degree of variability will not exceed the predetermined amount.