Supercritical Water Cracking and Washing of Used Polymer
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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 <SUP>13</SUP>C-NMR analysis of PO obtained by SCW D<SUB>2</SUB>O cracking demonstrates that the terminal methyl carbons are deuterated as a clear indication of hydrogen supply by SCW.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 1429-1431, 1998
The Japan Society of High Pressure Science and Technology