The Pyrolysis And Gasification Of
High Density Polyethylene In A Batch Reactor
Author(s)
O. Klein-Bendavid, Y. Peled, D. Tavor, T. Ohaion, P. Elias
& G. Bar-Nes
Abstract
Solid organic waste contaminated with radionuclides is a challenging wasteform
in its raw state. NRCN, as the national repository for radioactive waste in Israel,
accepts all such waste from industry, hospitals, universities and from the Israeli
nuclear research centers. Organic waste is characterized by its high volume to
weight ratio, together with the hazard of its radiolysis and consequently, the
generation of combustible and explosive gases (e.g. H2 and light hydrocarbons).
Thus, minimizing waste volumes together with stabilizing the wasteform are of
high significance in the treatment of contaminated polymers. In this study, the
thermal decomposition process is aimed at maximizing the room temperature gas
yield, and minimizing the oil and wax fraction that will be harder to entrain in a
large scale system.
High density polyethylene (HDPE) is a thermoplastic polyolefin characterized
by its high strength and diverse utilities. In the current research, we investigated
the thermal decomposition of HDPE using thermogravimetric analysis (TGA) at
the milligram scale; whereas a laboratory scale thermal decomposition system
was utilized for experiments at the gram scale. The TGA method enables the
study of the thermal decomposition parameters, whereas the macro-scale
experimental system enables the study of the decomposition products (e.g. char,
wax, oil and gas).
Polymer decomposition was studied under variable atmospheres, ranging
from pure pyrolysis, under a nitrogen atmosphere, to gasification under 88%
nitrogen and 12% oxygen atmosphere in the macro-scale system (with a similar
total gas flow rate). Only pyrolytic conditions were applied in the TGA
Keywords
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