On-line determination of polymer properties in a continuous
polymerization reactor
    3.
    发明授权
    On-line determination of polymer properties in a continuous polymerization reactor 失效
    在连续聚合反应器中聚合物性质的在线测定

    公开(公告)号:US5065336A

    公开(公告)日:1991-11-12

    申请号:US353690

    申请日:1989-05-18

    Inventor: Alberto Buchelli

    CPC classification number: C08F2/00 B01J19/0006 C08F10/00 C08F2400/02

    Abstract: The molecular weights (Mw and Mn) and polydispersity (Mw/Mn) of a polymer have significant impact on the final product properties and processability of materials made out of it. This invention provides a method for on-line prediction of polymer properties. In a continuous polymerization reactor in which an irreversible polymerization reaction occurs, sensors provide axial temperature and pressure profile in the reactor as well as monomer flow rates and concentration for determining Mw, Mn and polydispersity. Based on a non-Newtonian fluid mechanics analysis, differential influx analysis of a side stream incorporation and determination of the moments of the molecular weight distribution via a Newton-Raphson algorithm, the model calculates an axial polymer properties profile.On-line real time "analytical measurement" of polymer properties is used to alert the operator of unusual reactor problems, to optimize reactor operation during shut-down and start-up or rate changes. This allows correlation of polymer properties to product performance in downstream processes.

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