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Purification of Polymers by Supercritical Fluid Extraction in Processing Machines

  • L. A. Kleintjens

Abstract

Many organic (low-molecular) components can be dissolved in a variety of simple fluids under near- or supercritical thermodynamic conditions. The phase behaviour a such mixtures is nowadays well-understood and several extraction procedures based on supercritical dissolution processes are on stream. Laboratory equipment, as well as bench-scale units for such high-pressure research, are commercially available and thermodynamic models have been developed that can direct and correlate the experimental research.

The high diffusion speed of small molecules (even under nearcritical conditions) in comparison with ordinary solvents and the dissolution selectivity of such systems can be used in the extraction of low-molecular organic products out of amorphous polymeric materials. Some results for acrylonitrile containing (co-) polymers/blends and thermoplastic polymers like ethylene-propylene-diene terpolymers are reported.

First extruder experiments show that this technique can be successfully applied to polymers in processing machines.

Keywords

Processing Machine Phase Behaviour Supercritical Fluid Extraction Longe Extraction Time EPDM Rubber 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Elsevier Science Publishers Ltd 1989

Authors and Affiliations

  • L. A. Kleintjens
    • 1
  1. 1.DSM ResearchGeleenThe Netherlands

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