Modeling of multicomponent drying of polymer films

✍ Scribed by Sacide Alsoy; J. Larry Duda

• Publisher: American Institute of Chemical Engineers
• Year: 1999
• Tongue: English
• Weight: 167 KB
• Volume: 45
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690450420

✦ Synopsis

The drying of ®olatile sol®ents from a coated film is a complicated process since it in®ol®es simultaneous heat and mass transfer controlled by complex transport and thermodynamic beha®ior of polymer solutions. In this work, a model is de®eloped to describe the drying beha®ior of multicomponent polymer solutions deposited on the impermeable substrate. A key component of the model is incorporation of multicomponent diffusion coefficients that consist of thermodynamic factors and self-diffusi®ities. Vrentas-Duda free-®olume theory was used for predicting concentration and temperature dependency of self-diffusion coefficients. Drying processes in o®ens with different zones in which temperature, ®elocity, andror partial pressure of each sol®ent ®ary from zone to zone are considered. The predictions from the models pro®ide detailed information about the relati®e importance of internal and external resistances to drying, effect of operating conditions, effect of the multiple-zone approach, as well as sensiti®ity of all physical properties on the drying rate. The ®alidity of the model was confirmed by comparing predictions with the drying data a®ailable in the literature and the data collected in our laboratories. The experimental data and the simulation results are in good agreement.