Removal of organic impurities from polymer pellets

An investigation into the behavior of removing low molecular organics from polymer pellets in a countercurrent extraction column is presented. A mathe matical model is developed, describing it in terms of intraparticle diffusi on, adsorption. interphase equilibrium, convection and dispersion. The corr esponding parameters are determined using nonlinear regression. The resulti ng partial differential equations are solved using a numerical method. The validity of the model is verified by means of experimental data.