DIFFUSION CHARACTERISTICS OF VINYL-CHLORIDE FROM PVC IN SLURRY PHASE

The porous nature of poly(vinyl chloride) (PVC) brings along the probl em of residual vinyl chloride in the final product. Stripping techniqu es are developed to eliminate vinyl chloride to the desired levels. Af ter a certain extent of monomer removal, the stripping rate of vinyl c hloride is limited by diffusion. Therefore, the diffusion characterist ics of vinyl chloride from PVC slurries was investigated. Stripping wa s carried out at the boiling point of water where the generated steam was used as a carrier substance. The boiling point of water was change d by elevating the pressures. The dependence of diffusion on concentra tion is put forward and the activation energy of diffusion was calcula ted.