Supercritical Water Cracking and Washing of Used Polymer.

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  • Tennoh T.
    Nishikawa Rubber Co., Ltd.,
  • Enomot H.
    Department of Geoseience and Technology, Faculty of Engineering, Tohoku University
  • Wakai C.
    Institute for Chemical Research, Kyoto University
  • Nakahar M.
    Institute for Chemical Research, Kyoto University

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  • Supercritical Water Cracking and Washin

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Abstract

A rubber polymer (EPDM, ethylene-propylene-diene-terpolymer) and its vulcanized rubber were cracked to paraffin oil (PO) in NaOH-containing supercrtitical water (SCW) at 420°C and 30 MPa. PO recovered as a hexane-soluble cracking component could be recycled as the rubber softener because sulfurs added to the rubber for the elasticity were washed out in SCW. The SCW polymer cracking is not oxidative but reductive. The 13C-NMR analysis of PO obtained by SCW D2O cracking demonstrates that the terminal methyl carbons are deuterated as a clear indication of hydrogen supply by SCW.

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