Recycling of poly(ethylene terephthalate) waste through methanolic pyrolysis in a microwave reactor

Mohammad Nahid Siddiqui; Halim Hamid Redhwi; Dimitris S. Achilias

doi:10.1016/j.jaap.2012.09.007

Recycling of poly(ethylene terephthalate) waste through methanolic pyrolysis in a microwave reactor

Mohammad Nahid Siddiqui^*
, Halim Hamid Redhwi
, Dimitris S. Achilias

^*Corresponding author for this work

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

86 Scopus citations

Abstract

In this study, the methanolic pyrolysis (methanolysis) of poly(ethylene terephthalate) (PET) taken from waste soft-drink bottles, under microwave irradiation, is proposed as a recycling method with substantial energy saving. The reaction was carried out with methanol with and without the use of zinc acetate as catalyst in a sealed microwave reactor in which the pressure and temperature were controlled and recorded. Experiments under constant temperature or microwave power were carried out at several time intervals. The main product dimethyl-terephthalate was analyzed and identified by FTIR and DSC measurements. It was found that PET depolymerization, is favored by increasing temperature, time and microwave power. High degrees of depolymerization were measured at temperatures near 180°C and at microwave power higher than 150 W. Most of the degradation was found to occur during the initial 5-10 min. Compared to conventional pyrolysis methods, microwave irradiation during methanolic pyrolysis of PET certainly results in shorter reaction times supporting thus the conclusion that this method is a very beneficial one for the recycling of PET wastes.

Original language	English
Pages (from-to)	214-220
Number of pages	7
Journal	Journal of Analytical and Applied Pyrolysis
Volume	98
DOIs	https://doi.org/10.1016/j.jaap.2012.09.007
State	Published - Nov 2012

Bibliographical note

Funding Information:
The financial support provided by King Abdulaziz City for Science and Technology (KACST), Riyadh, Saudi Arabia through Project No. AR-27-101 for this work is gratefully acknowledged. The support from King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia and Laboratory of Organic Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, Greece is sincerely appreciated.

UN SDGs

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

SDG 12 Responsible Consumption and Production

Keywords

Methanolic pyrolysis
Microwave irradiation
PET
Recycling

ASJC Scopus subject areas

Analytical Chemistry
Fuel Technology

Access to Document

10.1016/j.jaap.2012.09.007

Cite this

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title = "Recycling of poly(ethylene terephthalate) waste through methanolic pyrolysis in a microwave reactor",

abstract = "In this study, the methanolic pyrolysis (methanolysis) of poly(ethylene terephthalate) (PET) taken from waste soft-drink bottles, under microwave irradiation, is proposed as a recycling method with substantial energy saving. The reaction was carried out with methanol with and without the use of zinc acetate as catalyst in a sealed microwave reactor in which the pressure and temperature were controlled and recorded. Experiments under constant temperature or microwave power were carried out at several time intervals. The main product dimethyl-terephthalate was analyzed and identified by FTIR and DSC measurements. It was found that PET depolymerization, is favored by increasing temperature, time and microwave power. High degrees of depolymerization were measured at temperatures near 180°C and at microwave power higher than 150 W. Most of the degradation was found to occur during the initial 5-10 min. Compared to conventional pyrolysis methods, microwave irradiation during methanolic pyrolysis of PET certainly results in shorter reaction times supporting thus the conclusion that this method is a very beneficial one for the recycling of PET wastes.",

keywords = "Methanolic pyrolysis, Microwave irradiation, PET, Recycling",

author = "Siddiqui, \{Mohammad Nahid\} and Redhwi, \{Halim Hamid\} and Achilias, \{Dimitris S.\}",

note = "Funding Information: The financial support provided by King Abdulaziz City for Science and Technology (KACST), Riyadh, Saudi Arabia through Project No. AR-27-101 for this work is gratefully acknowledged. The support from King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia and Laboratory of Organic Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, Greece is sincerely appreciated.",

year = "2012",

month = nov,

doi = "10.1016/j.jaap.2012.09.007",

language = "English",

volume = "98",

pages = "214--220",

journal = "Journal of Analytical and Applied Pyrolysis",

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AU - Siddiqui, Mohammad Nahid

AU - Redhwi, Halim Hamid

AU - Achilias, Dimitris S.

N1 - Funding Information: The financial support provided by King Abdulaziz City for Science and Technology (KACST), Riyadh, Saudi Arabia through Project No. AR-27-101 for this work is gratefully acknowledged. The support from King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia and Laboratory of Organic Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, Greece is sincerely appreciated.

PY - 2012/11

Y1 - 2012/11

N2 - In this study, the methanolic pyrolysis (methanolysis) of poly(ethylene terephthalate) (PET) taken from waste soft-drink bottles, under microwave irradiation, is proposed as a recycling method with substantial energy saving. The reaction was carried out with methanol with and without the use of zinc acetate as catalyst in a sealed microwave reactor in which the pressure and temperature were controlled and recorded. Experiments under constant temperature or microwave power were carried out at several time intervals. The main product dimethyl-terephthalate was analyzed and identified by FTIR and DSC measurements. It was found that PET depolymerization, is favored by increasing temperature, time and microwave power. High degrees of depolymerization were measured at temperatures near 180°C and at microwave power higher than 150 W. Most of the degradation was found to occur during the initial 5-10 min. Compared to conventional pyrolysis methods, microwave irradiation during methanolic pyrolysis of PET certainly results in shorter reaction times supporting thus the conclusion that this method is a very beneficial one for the recycling of PET wastes.

AB - In this study, the methanolic pyrolysis (methanolysis) of poly(ethylene terephthalate) (PET) taken from waste soft-drink bottles, under microwave irradiation, is proposed as a recycling method with substantial energy saving. The reaction was carried out with methanol with and without the use of zinc acetate as catalyst in a sealed microwave reactor in which the pressure and temperature were controlled and recorded. Experiments under constant temperature or microwave power were carried out at several time intervals. The main product dimethyl-terephthalate was analyzed and identified by FTIR and DSC measurements. It was found that PET depolymerization, is favored by increasing temperature, time and microwave power. High degrees of depolymerization were measured at temperatures near 180°C and at microwave power higher than 150 W. Most of the degradation was found to occur during the initial 5-10 min. Compared to conventional pyrolysis methods, microwave irradiation during methanolic pyrolysis of PET certainly results in shorter reaction times supporting thus the conclusion that this method is a very beneficial one for the recycling of PET wastes.

KW - Methanolic pyrolysis

KW - Microwave irradiation

KW - PET

KW - Recycling

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DO - 10.1016/j.jaap.2012.09.007

M3 - Article

AN - SCOPUS:84868339804

SN - 0165-2370

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JO - Journal of Analytical and Applied Pyrolysis

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ER -

Recycling of poly(ethylene terephthalate) waste through methanolic pyrolysis in a microwave reactor

Abstract

Bibliographical note

UN SDGs

Keywords

ASJC Scopus subject areas

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