Thermo-catalytic pyrolysis of waste polyethylene bottles in a packed bed reactor with different bed materials and catalysts

Farah Obeid, Joseph Zeaiter, Ala'A H. Al-Muhtaseb, Kamal Bouhadir

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Plastic waste is an increasing economic and environmental problem as such there is a great need to process this waste and reduce its environmental impact. In this work, the pyrolysis of high density polyethylene (HDPE) waste products was investigated using both thermal and catalytic cracking techniques. The experimental work was carried out using packed bed reactor operating under an inert atmosphere at 450 °C. Different reactor bed materials, including sand, cement and white clay were used to enhance the thermal cracking of HDPE. In addition, the catalytic effect of sodium hydroxide, HUSY and HBeta zeolite catalysts on the degradation of HDPE waste was also investigated. The reactor beds were found to significantly alter the yield as well as the product composition. Products such as paraffins (≤C44), olefins (≤C22), aromatics (≤C14) and alcohols (C 16 and C17) were obtained at varying rates. The highest yield of liquid (82%) was obtained over a cement powder bed with a paraffin yield of 58%. The yield of paraffins and olefins followed separate paths, for paraffins it was found to increase in the order or Cement > White clay > Silica Sand, whereas for the olefins it was in the reverse order Silica Sand > White clay > Cement. The results obtained in this work exhibited a higher P/O ratio than expected, where the amount of generated paraffins was greater than 60% in most cases. Less olefin was generated as a consequence. This indicates that the product generated is more suited to be used as a fuel rather than as a chemical feedstock. The carbon chain length was narrowed to C 10-C28 when the zeolitic catalysts were employed, as well as a significant yield of aromatics was obtained mainly naphthalene and d-limonene as an indication that the products obtained are fuel-like products.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalEnergy Conversion and Management
Volume85
DOIs
Publication statusPublished - 2014

Fingerprint

Bottles
Packed beds
Paraffins
Polyethylenes
Pyrolysis
Olefins
Kaolin
Cements
High density polyethylenes
Catalysts
Silica sand
Catalytic cracking
Naphthalene
Chain length
Feedstocks
Environmental impact
Alcohols
Sand
Sodium
Plastics

Keywords

  • Acidic zeolites
  • Catalytic pyrolysis
  • Packed bed reactor
  • Paraffin
  • Waste plastics

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Nuclear Energy and Engineering
  • Renewable Energy, Sustainability and the Environment

Cite this

Thermo-catalytic pyrolysis of waste polyethylene bottles in a packed bed reactor with different bed materials and catalysts. / Obeid, Farah; Zeaiter, Joseph; Al-Muhtaseb, Ala'A H.; Bouhadir, Kamal.

In: Energy Conversion and Management, Vol. 85, 2014, p. 1-6.

Research output: Contribution to journalArticle

@article{b213f4646b0f47cd991394897e0a6566,
title = "Thermo-catalytic pyrolysis of waste polyethylene bottles in a packed bed reactor with different bed materials and catalysts",
abstract = "Plastic waste is an increasing economic and environmental problem as such there is a great need to process this waste and reduce its environmental impact. In this work, the pyrolysis of high density polyethylene (HDPE) waste products was investigated using both thermal and catalytic cracking techniques. The experimental work was carried out using packed bed reactor operating under an inert atmosphere at 450 °C. Different reactor bed materials, including sand, cement and white clay were used to enhance the thermal cracking of HDPE. In addition, the catalytic effect of sodium hydroxide, HUSY and HBeta zeolite catalysts on the degradation of HDPE waste was also investigated. The reactor beds were found to significantly alter the yield as well as the product composition. Products such as paraffins (≤C44), olefins (≤C22), aromatics (≤C14) and alcohols (C 16 and C17) were obtained at varying rates. The highest yield of liquid (82{\%}) was obtained over a cement powder bed with a paraffin yield of 58{\%}. The yield of paraffins and olefins followed separate paths, for paraffins it was found to increase in the order or Cement > White clay > Silica Sand, whereas for the olefins it was in the reverse order Silica Sand > White clay > Cement. The results obtained in this work exhibited a higher P/O ratio than expected, where the amount of generated paraffins was greater than 60{\%} in most cases. Less olefin was generated as a consequence. This indicates that the product generated is more suited to be used as a fuel rather than as a chemical feedstock. The carbon chain length was narrowed to C 10-C28 when the zeolitic catalysts were employed, as well as a significant yield of aromatics was obtained mainly naphthalene and d-limonene as an indication that the products obtained are fuel-like products.",
keywords = "Acidic zeolites, Catalytic pyrolysis, Packed bed reactor, Paraffin, Waste plastics",
author = "Farah Obeid and Joseph Zeaiter and Al-Muhtaseb, {Ala'A H.} and Kamal Bouhadir",
year = "2014",
doi = "10.1016/j.enconman.2014.05.075",
language = "English",
volume = "85",
pages = "1--6",
journal = "Energy Conversion and Management",
issn = "0196-8904",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Thermo-catalytic pyrolysis of waste polyethylene bottles in a packed bed reactor with different bed materials and catalysts

AU - Obeid, Farah

AU - Zeaiter, Joseph

AU - Al-Muhtaseb, Ala'A H.

AU - Bouhadir, Kamal

PY - 2014

Y1 - 2014

N2 - Plastic waste is an increasing economic and environmental problem as such there is a great need to process this waste and reduce its environmental impact. In this work, the pyrolysis of high density polyethylene (HDPE) waste products was investigated using both thermal and catalytic cracking techniques. The experimental work was carried out using packed bed reactor operating under an inert atmosphere at 450 °C. Different reactor bed materials, including sand, cement and white clay were used to enhance the thermal cracking of HDPE. In addition, the catalytic effect of sodium hydroxide, HUSY and HBeta zeolite catalysts on the degradation of HDPE waste was also investigated. The reactor beds were found to significantly alter the yield as well as the product composition. Products such as paraffins (≤C44), olefins (≤C22), aromatics (≤C14) and alcohols (C 16 and C17) were obtained at varying rates. The highest yield of liquid (82%) was obtained over a cement powder bed with a paraffin yield of 58%. The yield of paraffins and olefins followed separate paths, for paraffins it was found to increase in the order or Cement > White clay > Silica Sand, whereas for the olefins it was in the reverse order Silica Sand > White clay > Cement. The results obtained in this work exhibited a higher P/O ratio than expected, where the amount of generated paraffins was greater than 60% in most cases. Less olefin was generated as a consequence. This indicates that the product generated is more suited to be used as a fuel rather than as a chemical feedstock. The carbon chain length was narrowed to C 10-C28 when the zeolitic catalysts were employed, as well as a significant yield of aromatics was obtained mainly naphthalene and d-limonene as an indication that the products obtained are fuel-like products.

AB - Plastic waste is an increasing economic and environmental problem as such there is a great need to process this waste and reduce its environmental impact. In this work, the pyrolysis of high density polyethylene (HDPE) waste products was investigated using both thermal and catalytic cracking techniques. The experimental work was carried out using packed bed reactor operating under an inert atmosphere at 450 °C. Different reactor bed materials, including sand, cement and white clay were used to enhance the thermal cracking of HDPE. In addition, the catalytic effect of sodium hydroxide, HUSY and HBeta zeolite catalysts on the degradation of HDPE waste was also investigated. The reactor beds were found to significantly alter the yield as well as the product composition. Products such as paraffins (≤C44), olefins (≤C22), aromatics (≤C14) and alcohols (C 16 and C17) were obtained at varying rates. The highest yield of liquid (82%) was obtained over a cement powder bed with a paraffin yield of 58%. The yield of paraffins and olefins followed separate paths, for paraffins it was found to increase in the order or Cement > White clay > Silica Sand, whereas for the olefins it was in the reverse order Silica Sand > White clay > Cement. The results obtained in this work exhibited a higher P/O ratio than expected, where the amount of generated paraffins was greater than 60% in most cases. Less olefin was generated as a consequence. This indicates that the product generated is more suited to be used as a fuel rather than as a chemical feedstock. The carbon chain length was narrowed to C 10-C28 when the zeolitic catalysts were employed, as well as a significant yield of aromatics was obtained mainly naphthalene and d-limonene as an indication that the products obtained are fuel-like products.

KW - Acidic zeolites

KW - Catalytic pyrolysis

KW - Packed bed reactor

KW - Paraffin

KW - Waste plastics

UR - http://www.scopus.com/inward/record.url?scp=84902376079&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84902376079&partnerID=8YFLogxK

U2 - 10.1016/j.enconman.2014.05.075

DO - 10.1016/j.enconman.2014.05.075

M3 - Article

AN - SCOPUS:84902376079

VL - 85

SP - 1

EP - 6

JO - Energy Conversion and Management

JF - Energy Conversion and Management

SN - 0196-8904

ER -