Patent ID: 7838605
Filing Date: 2010-11-23
Classification: B01J,C08F

Abstract:
1. A method of olefin polymerization, the method comprising: (a) determining a flow ratio to a polymerization reactor, FR (b) obtaining a leading indicator function, LI, defined by: where GR where FR where FR where FR where td is the delay time for recycle gas analysis; where β=1−exp(−T/(comonomer residence time) =1−exp(−-Δt/τ); where Δt =the time step chosen to update the LI calculation; where τ=the residence time in the reactor of the comonomer that is used to calculate the LI with the proviso that the comonomer dissolved in the polymerized olefin is included in said comonomer used to calculate the LI; (c) comparing the LI to a target value; (d) adjusting at least one reactor parameter in response to a deviation between the LI and the target value; and (e) controlling a polymer product property.