1989 Volume 15 Issue 3 Pages 673-675
Supercritical carbon dioxide was used to remove methylene chloride from granular polycarbonate. Supercritical CO2 was continuously passed through a fixed bed of 400 mg of PC involving methylene chloride. It was confirmed that removal of the solvent was possible even below the glass transition temperature (Tg=155°C) of polycarbonate. In addition, Fick's model was employed to yield the diffusion coefficient of the removal process. Calculated concentration curves using the value of the diffusion coefficients agreed well with the experimental ones.
