scholarly journals Study of pyrolysis of high density polyethylene in the open system and estimation of its capability for co-pyrolysis with lignite

2018 ◽  
Vol 83 (7-8) ◽  
pp. 923-940
Author(s):  
Ivan Kojic ◽  
Achim Bechtel ◽  
Friedrich Kittinger ◽  
Nikola Stevanovic ◽  
Marko Obradovic ◽  
...  
Keyword(s):  
Open System ◽  
High Density Polyethylene ◽  
Synergetic Effect ◽  
Polar Compounds ◽  
High Density ◽  
Feed Stream ◽  
Gaseous Products ◽  
Liquid Products ◽  
Plastic Bag ◽  
Pre Treatment

Pyrolysis of high density polyethylene (HDPE) in the open system was studied. A plastic bag for food packing was used as a source of HDPE. Pyrolysis was performed at temperatures of 400, 450 and 500?C, which were chosen based on thermogravimetric analysis. The HDPE pyrolysis yielded liquid, gaseous and solid products. Temperature rise resulted in the increase of conversion of HDPE into liquid and gaseous products. The main constituents of liquid pyrolysates are 1-n-alkenes, n-alkanes and terminal n-dienes. The composition of liquid products indicates that the performed pyrolysis of HDPE could not serve as a standalone operation for the production of gasoline or diesel, but preferably as a pre-treatment to yield a product to be blended into a refinery or petrochemical feed stream. The advantage of a liquid pyrolysate in comparison to crude oil is the extremely low content of aromatic hydrocarbons and the absence of polar compounds. The gaseous products have desirable composition and consist mainly of methane and ethene. The solid residues do not produce ash by combustion and have high calorific values. Co-pyrolysis of HDPE with mineral-rich lignite indicated positive synergetic effect at 450 and 500?C, which is reflected through the increased experimental yields of liquid and gaseous products in comparison to theoretical ones.

Production of Briquettes from a Blend of HDPE (High Density Polyethylene) Plastic Wastes and Teak (Tectona grandis Linn. f) Sawdust Using Different Natural Adhesives as the Binder

2021 ◽  
Vol 882 ◽  
pp. 273-279
Author(s):  
R.M. Faisal ◽  
Alvin Ardian ◽  
Via Khoiriyah ◽  
Achmad Chafidz
Keyword(s):  
High Density Polyethylene ◽  
Tectona Grandis ◽  
Rice Flour ◽  
Volatile Matter ◽  
Plastic Waste ◽  
High Density ◽  
Heating Value ◽  
High Heating Value ◽  
High Heating ◽  
Plastic Bag

HDPE (High Density Polyethylene) is one type of plastics that has been used in many various applications. We frequently used it in our daily life, such as plastic bag, dairy products packaging, etc., which often end up being waste, which is non-biodegradable. This plastic waste has good potential to be used in production of briquettes because it has a high heating value. Teak sawdust is also considered waste and usually not properly utilized. Nevertheless, it has a high heating value and sufficiently low level of volatile matter. Therefore, mixing HDPE plastic waste with biomass charcoal such as teak sawdust to make briquettes as an alternative domestic fuel is an interesting idea. The objective of this research was to make briquettes by mixing HDPE plastic waste and teak sawdust. The effects of two different natural adhesives (i.e. rice flour and corn flour) and the ratio of plastic waste and teak sawdust were investigated. The results of the experiment show that the best ratio of plastic waste and teak sawdust that produce the best quality of briquettes in this study was 50% : 50% and by using rice flour adhesive. The following are the results for this sample, the duration of fire starts to ignite was about 2.3 minutes; the duration of fire boils 125 mL of water was 12.8 minutes; and the duration of the briquettes burn to ashes was about 62 minutes.

scholarly journals Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 759
Author(s):  
Ivan Kojić ◽  
Achim Bechtel ◽  
Nikoleta Aleksić ◽  
Dragana Životić ◽  
Snežana Trifunović ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
Plastic Material ◽  
Isotope Analysis ◽  
Synergetic Effect ◽  
High Density ◽  
Low Rank ◽  
Gas Chromatography Mass Spectrometry ◽  
Low Rank Coal ◽  
Simultaneous Treatment ◽  
Pyrolysis Products

The mutual impact of low-quality lignite and high-density polyethylene (HDPE) during open system pyrolysis was investigated, aiming to improve utilization of lignite with simultaneous treatment of HDPE waste. Pyrolysis of lignite, HDPE, and their mixture (mass ratio, 1:1) was performed at temperatures 400, 450, 500, 550, and 600 °C. Initial substrates and pyrolysis products were characterized by thermogravimetric analysis (TGA), gas chromatography–mass spectrometry (GC–MS), specific carbon isotope analysis of individual hydrocarbons (δ13C), Rock-Eval pyrolysis, and elemental analysis. The positive synergetic effect during co-pyrolysis of lignite/HDPE mixture was observed at temperatures ≥450 °C, with the greatest being at 500 °C. The highest yield of liquid co-pyrolysis products with a similar composition to that of crude oils is also noticed at 500 °C. The yields of liquid and gaseous products and quality of pyrolytic products obtained by co-pyrolysis of lignite/HDPE mixture are notably improved compared with pyrolysis of lignite alone. On the other hand, data obtained from pyrolysis of HDPE alone indicate that it cannot be concurrent to well-developed catalytic thermal processes for polymer recycling. However, concerning the huge amount of produced HDPE, at least part of this plastic material can be reused for advanced thermal treatment of lignite, particularly in countries where this low-rank coal represents the main source of energy.

Study of the Kinetics of Thermal Destruction of Crossed Polyethylene

2019 ◽  
Vol 5 (12) ◽  
pp. 37-46
Author(s):  
K. Chalov ◽  
Yu. Lugovoy ◽  
Yu. Kosivtsov ◽  
E. Sulman
Keyword(s):  
Total Yield ◽  
Calorific Value ◽  
High Heat ◽  
Process Temperature ◽  
Optimum Process ◽  
Quantitative Composition ◽  
Pyrolysis Gas ◽  
Gaseous Products ◽  
Liquid Products ◽  
Kinetics Of

This paper presents a study of the process of thermal degradation of crosslinked polyethylene. The kinetics of polymer decomposition was studied by thermogravimetry. Crosslinked polyethylene showed high heat resistance to temperatures of 400 °C. The temperature range of 430–500 °C was determined for the loss of the bulk of the sample. According to thermogravimetric data, the decomposition process proceeds in a single stage and includes a large number of fracture, cyclization, dehydrogenation, and other reactions. The process of pyrolysis of a crosslinked polymer in a stationary-bed metal reactor was investigated. The influence of the process temperature on the yield of solid, liquid, and gaseous pyrolysis products was investigated. The optimum process temperature was 500 °C. At this temperature, the yield of liquid and gaseous products was 85.0 and 12.5% (mass.), Respectively. Samples of crosslinked polyester decomposed almost completely. The amount of carbon–containing residue was 3.5% by weight of the feedstock. With increasing temperature, the yield of liquid products decreased slightly and the yield of gaseous products increased, but their total yield did not increase. For gaseous products, a qualitative and quantitative composition was determined. The main components of the pyrolysis gas were hydrocarbons C1–C4. The calorific value of pyrolysis gas obtained at a temperature of 500 °C was 17 MJ/m3. Thus, the pyrolysis process can be used to process crosslinked polyethylene wastes to produce liquid hydrocarbons and combustible gases.

Composition and Surface Topography Effects on Apatite-Forming Ability of Ceramic-Polymer Composites

2003 ◽  
Vol 774 ◽  
Author(s):  
Susan M. Rea ◽  
Serena M. Best ◽  
William Bonfield
Keyword(s):  
Surface Topography ◽  
High Density Polyethylene ◽  
High Density ◽  
Apatite Layer ◽  
Biologically Active ◽  
Human Blood Plasma ◽  
Apatite Formation ◽  
Polyethylene Matrix ◽  
Composite Surface ◽  
X Ray

AbstractHAPEXTM (40 vol% hydroxyapatite in a high-density polyethylene matrix) and AWPEX (40 vol% apatite-wollastonite glass ceramic in a high density polyethylene matrix) are composites designed to provide bioactivity and to match the mechanical properties of human cortical bone. HAPEXTM has had clinical success in middle ear and orbital implants, and there is great potential for further orthopaedic applications of these materials. However, more detailed in vitro investigations must be performed to better understand the biological interactions of the composites and so the bioactivity of each material was assessed in this study. Specifically, the effects of controlled surface topography and ceramic filler composition on apatite layer formation in acellular simulated body fluid (SBF) with ion concentration similar to those of human blood plasma were examined. Samples were prepared as 1 cm × 1 cm × 1 mm tiles with polished, roughened, or parallel-grooved surface finishes, and were incubated in 20 ml of SBF at 36.5 °C for 1, 3, 7, or 14 days. The formation of a biologically active apatite layer on the composite surface after immersion was demonstrated by thin-film x-ray diffraction (TF-XRD), environmental scanning electron microscopy (ESEM) imaging and energy dispersive x-ray (EDX) analysis. Variations in sample weight and solution pH over the period of incubation were also recorded. Significant differences were found between the two materials tested, with greater bioactivity in AWPEX than HAPEXTM overall. Results also indicate that within each material the surface topography is highly important, with rougher samples correlated to earlier apatite formation.

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