Characteristics of LDPE pyrolysis |
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Authors: | Jong Jin Park Kwinam Park Jin-Won Park Dong Chan Kim |
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Affiliation: | (1) Dept. of Chemical Engineering, Yonsei University, 120-749 Seoul, Korea;(2) Department of Energy and Environmental Research, Korea Institute of Energy Research, 305-343 Daejeon, Korea |
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Abstract: | Pyrolysis of low-density polyethylene (LDPE) was studied in order to relieve environmental pollution and recover the monomer
or fuel. LDPE was thermally decomposed with and without catalyst. First, efficiency of oil production was analyzed according
to the variation of reaction conditions such as reaction temperature, types of additives and catalyst, and contacting method.
In non-catalytic LDPE pyrolysis, isothermal reaction was almost similar to non-isothermal reaction. Light oil was produced
with low reaction temperature (430 °C) in the isothermal reaction, but low heating rate caused light oil production in the
non-isothermal reaction. When pyrolyzed polyethylene (PE oil) was applied as an additive, no significant effect showed in
the isothermal reaction. In catalytic LDPE pyrolysis (10%NiO/S-A) with additives, efficiency greatly increased especially
with polystyrene (PS) addition. It was also found that the molecular weight distribution of product oil could be controlled
by applying different additives. When a catalytic reactor was used, the amount of the low molecular weight compound increased
as flow rate of thermally decomposed gas was lowered.
This paper is dedicated to Professor Wha Young Lee on the occasion of his retirement from Seoul National University. |
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Keywords: | Low Density Polyethylene (LDPE) Pyrolysis Catalysts Additives Catalytic Reactor |
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