Evaluation of Pyrolysis Wax as a Solvent in Polyolefin Pyrolysis Processing
Document Type
Article
Publication Date
7-20-2022
Department
Department of Chemical Engineering
Abstract
A lack of recycling-process technologies has led to plastic pollution becoming one of the world's greatest environmental crises. Plastic fast pyrolysis is a recycling technology that may enable the conversion of waste plastic into virgin-quality plastic resin, thereby contributing to a circular economy for plastics. In this study, pyrolysis wax, a byproduct of the plastic pyrolysis process, was evaluated for its use as a solvent for plastic waste in preparation for pyrolysis. The viscosity of a 1:1 ratio mixture of pyrolysis wax with HDPE and PP at 220, 240, and 260 °C was measured. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were performed at three different weight percentages of the samples (25, 50, and 75 wt %) to determine the solubility and characterize the thermal behavior of HDPE/pyrolysis wax, LDPE/pyrolysis wax, and PP/pyrolysis wax mixtures. A unique semibatch pyrolysis pilot plant, including a dissolution tank and a tubular pyrolysis reactor, was used to convert pyrolysis wax/plastic feed at 600 °C. The reaction exhibited a complete conversion with a residence time of approximately 2 s, while GC-MS analysis demonstrated pyrolysis of both the wax and HDPE in the feed. Plastic waste and pyrolysis wax are soluble at 240 °C for up to 75 wt % of plastic. The pilot plant experiment, with its semibatch system involving a dissolution tank, verifies the feasibility of using pyrolysis wax as a viscosity-reducing strategy prior to pyrolysis.
Publication Title
Industrial and Engineering Chemistry Research
Recommended Citation
Zolghadr, A.,
Kulas, D. G.,
&
Shonnard, D.
(2022).
Evaluation of Pyrolysis Wax as a Solvent in Polyolefin Pyrolysis Processing.
Industrial and Engineering Chemistry Research,
61(30), 11080-11088.
http://doi.org/10.1021/acs.iecr.2c01493
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/16329