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Plastic
Recycling using Supercritical Fluids
Idzumi OKAJIMA,
Takeshi SAKO
Shizuoka University
Nippon Gomu Kyokaishi,(2004),77(10),353-358 General Review in Japanese
Abstract
Plastic recycling using
supercritical fluids was investigated to develop promising future
techniques. Supercritical water (Tc=374,
Pc=22.1MPa) and supercritical methanol (Tc=239,
Pc=8.09MPa) were used mainly because they are chemically stable, cheap
and environmentally friendly. Here we introduced the several hopeful
applications: decomposition and recovery of constituent monomers from
polyethylene telephthalate and polyethylene naphtalate using supercritical
methanol, breaking of bridging point and subsequent material recycling
of cross-linked polyethylene using supercritical methanol, separation
and recovery of constituent monomer and plastic from laminate films
composed of polyamide and polyethylene using subcritical water, decomposition
of thermosetting plastic without solid residue using supercritical
water, decomposition of plastics and recovery of fibers in CFRP and
GFRP with supercritical water, decomposition and debromination of
flame-resistant polymer containing bromine atoms by using subcritical
water and gasification and hydrogen production of plastics by use
of supercritical water.
Keywords:
Supercritical water, Subcritical water, Supercritical methanol,
Chemical recycling, Material recycling, Plastic
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