Pyrolysis of mixed plastics for the recovery of useful products

Mohammad Nahid Siddiqui; Halim Hamid Redhwi

doi:10.1016/j.fuproc.2009.01.003

Pyrolysis of mixed plastics for the recovery of useful products

Mohammad Nahid Siddiqui^*, Halim Hamid Redhwi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

172 Scopus citations

Abstract

Thermal and catalytic pyrolysis of polystyrene (PS) with low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), poly-ethylene terephthalate (PET) plastics were carried out in a 25 cm³ stainless steel micro reactor at around 430-440 °C under 5.5-6.0 MPa of N₂ gas pressure for 1 h. Three reactions of each plastic with PS were conducted in the ratio of 1:1, 1:2 and 1:3. The amount of PS was varied to explore its role and reactivity. In all coprocessing reactions, ratio 1:1 afforded the best yields in the form pyrolytic oils. SIM distillation of hexane soluble portion showed that the low boiling fractions were not found and fractions were obtained only after 96 °C + boiling point. It could be due to the vaporization of high volatile components. In most of the binary pyrolysis, light cycle oil (LCO) fractions have low recovery than heavy cycle oil (HCO). GC identified some very important chemical compounds present in the liquid products obtained from the pyrolysis of mixed plastics. The results obtained from this study have shown usefulness and feasibility of the pyrolysis process of the mixed plastics as an alternative approach to feedstock recycling.

Original language	English
Pages (from-to)	545-552
Number of pages	8
Journal	Fuel Processing Technology
Volume	90
Issue number	4
DOIs	https://doi.org/10.1016/j.fuproc.2009.01.003
State	Published - Apr 2009

Bibliographical note

Funding Information:
The authors would like to express their sincere thanks and appreciation and also gratefully acknowledge the support received from King Fahd University of Petroleum & Minerals, Dhahran and SABIC, Riyadh, for successfully completing this project under SABIC Grants (Project # 2006-25).

Keywords

Coprocessing
Mixed plastics
Plastics waste management
Pyrolysis
Recycling

ASJC Scopus subject areas

General Chemical Engineering
Fuel Technology
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.fuproc.2009.01.003

Cite this

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title = "Pyrolysis of mixed plastics for the recovery of useful products",

abstract = "Thermal and catalytic pyrolysis of polystyrene (PS) with low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), poly-ethylene terephthalate (PET) plastics were carried out in a 25 cm3 stainless steel micro reactor at around 430-440 °C under 5.5-6.0 MPa of N2 gas pressure for 1 h. Three reactions of each plastic with PS were conducted in the ratio of 1:1, 1:2 and 1:3. The amount of PS was varied to explore its role and reactivity. In all coprocessing reactions, ratio 1:1 afforded the best yields in the form pyrolytic oils. SIM distillation of hexane soluble portion showed that the low boiling fractions were not found and fractions were obtained only after 96 °C + boiling point. It could be due to the vaporization of high volatile components. In most of the binary pyrolysis, light cycle oil (LCO) fractions have low recovery than heavy cycle oil (HCO). GC identified some very important chemical compounds present in the liquid products obtained from the pyrolysis of mixed plastics. The results obtained from this study have shown usefulness and feasibility of the pyrolysis process of the mixed plastics as an alternative approach to feedstock recycling.",

keywords = "Coprocessing, Mixed plastics, Plastics waste management, Pyrolysis, Recycling",

author = "Siddiqui, \{Mohammad Nahid\} and Redhwi, \{Halim Hamid\}",

note = "Funding Information: The authors would like to express their sincere thanks and appreciation and also gratefully acknowledge the support received from King Fahd University of Petroleum \& Minerals, Dhahran and SABIC, Riyadh, for successfully completing this project under SABIC Grants (Project \# 2006-25).",

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doi = "10.1016/j.fuproc.2009.01.003",

language = "English",

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pages = "545--552",

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AU - Siddiqui, Mohammad Nahid

AU - Redhwi, Halim Hamid

N1 - Funding Information: The authors would like to express their sincere thanks and appreciation and also gratefully acknowledge the support received from King Fahd University of Petroleum & Minerals, Dhahran and SABIC, Riyadh, for successfully completing this project under SABIC Grants (Project # 2006-25).

PY - 2009/4

Y1 - 2009/4

N2 - Thermal and catalytic pyrolysis of polystyrene (PS) with low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), poly-ethylene terephthalate (PET) plastics were carried out in a 25 cm3 stainless steel micro reactor at around 430-440 °C under 5.5-6.0 MPa of N2 gas pressure for 1 h. Three reactions of each plastic with PS were conducted in the ratio of 1:1, 1:2 and 1:3. The amount of PS was varied to explore its role and reactivity. In all coprocessing reactions, ratio 1:1 afforded the best yields in the form pyrolytic oils. SIM distillation of hexane soluble portion showed that the low boiling fractions were not found and fractions were obtained only after 96 °C + boiling point. It could be due to the vaporization of high volatile components. In most of the binary pyrolysis, light cycle oil (LCO) fractions have low recovery than heavy cycle oil (HCO). GC identified some very important chemical compounds present in the liquid products obtained from the pyrolysis of mixed plastics. The results obtained from this study have shown usefulness and feasibility of the pyrolysis process of the mixed plastics as an alternative approach to feedstock recycling.

AB - Thermal and catalytic pyrolysis of polystyrene (PS) with low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), poly-ethylene terephthalate (PET) plastics were carried out in a 25 cm3 stainless steel micro reactor at around 430-440 °C under 5.5-6.0 MPa of N2 gas pressure for 1 h. Three reactions of each plastic with PS were conducted in the ratio of 1:1, 1:2 and 1:3. The amount of PS was varied to explore its role and reactivity. In all coprocessing reactions, ratio 1:1 afforded the best yields in the form pyrolytic oils. SIM distillation of hexane soluble portion showed that the low boiling fractions were not found and fractions were obtained only after 96 °C + boiling point. It could be due to the vaporization of high volatile components. In most of the binary pyrolysis, light cycle oil (LCO) fractions have low recovery than heavy cycle oil (HCO). GC identified some very important chemical compounds present in the liquid products obtained from the pyrolysis of mixed plastics. The results obtained from this study have shown usefulness and feasibility of the pyrolysis process of the mixed plastics as an alternative approach to feedstock recycling.

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KW - Mixed plastics

KW - Plastics waste management

KW - Pyrolysis

KW - Recycling

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DO - 10.1016/j.fuproc.2009.01.003

M3 - Article

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SN - 0378-3820

VL - 90

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JF - Fuel Processing Technology

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ER -

Pyrolysis of mixed plastics for the recovery of useful products

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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