Recovery of carbon fibres and production of high quality fuel gas from the chemical recycling of carbon fibre reinforced plastic wastes

Eyup Yildirir, Jude Onwudili, Paul T Williams

Research output: Contribution to journalArticle

Abstract

A solvolysis process to depolymerize the resin fraction of carbon fibre reinforced plastic waste to recover carbon fibre, followed by hydrothermal gasification of the liquid residual product to produce fuel gas was investigated using batch reactors. The depolymerisation reactions were carried out in ethylene glycol and ethylene glycol/water mixtures at near-critical conditions of the two solvents. With ethylene glycol alone the highest resin removal of 92.1% was achieved at 400 °C. The addition of water to ethylene glycol led to higher resin removals compared to ethylene glycol alone. With an ethylene glycol/water ratio of 5, at 400 °C, resin removal was 97.6%, whereas it was 95.2% when this ratio was 3, at the same temperature. The mechanical properties of the recovered carbon fibre were tested and showed minimal difference in strength compared to the virgin carbon fibre. The product liquid, containing organic resin degradation products was then subjected to catalytic supercritical water gasification at 500 °C and 24 MPa in the presence of NaOH and Ru/Al2O3 as catalysts, respectively. Up to 60 mol.% of H2 gas was produced with NaOH as catalyst, and 53.7 mol.% CH4 gas was produced in the presence of Ru/Al2O3.
Original languageEnglish
Pages (from-to)107-114
Number of pages8
JournalJournal of Supercritical Fluids
Volume92
DOIs
Publication statusPublished - 31 Aug 2015

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carbon fiber reinforced plastics
Ethylene Glycol
Gas fuels
Carbon fiber reinforced plastics
carbon fibers
recycling
Ethylene glycol
Carbon fibers
Recycling
glycols
ethylene
resins
recovery
Resins
Recovery
gases
gasification
Water
Gasification
water

Bibliographical note

© 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Cite this

Yildirir, Eyup ; Onwudili, Jude ; Williams, Paul T . / Recovery of carbon fibres and production of high quality fuel gas from the chemical recycling of carbon fibre reinforced plastic wastes. In: Journal of Supercritical Fluids. 2015 ; Vol. 92. pp. 107-114.
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abstract = "A solvolysis process to depolymerize the resin fraction of carbon fibre reinforced plastic waste to recover carbon fibre, followed by hydrothermal gasification of the liquid residual product to produce fuel gas was investigated using batch reactors. The depolymerisation reactions were carried out in ethylene glycol and ethylene glycol/water mixtures at near-critical conditions of the two solvents. With ethylene glycol alone the highest resin removal of 92.1{\%} was achieved at 400 °C. The addition of water to ethylene glycol led to higher resin removals compared to ethylene glycol alone. With an ethylene glycol/water ratio of 5, at 400 °C, resin removal was 97.6{\%}, whereas it was 95.2{\%} when this ratio was 3, at the same temperature. The mechanical properties of the recovered carbon fibre were tested and showed minimal difference in strength compared to the virgin carbon fibre. The product liquid, containing organic resin degradation products was then subjected to catalytic supercritical water gasification at 500 °C and 24 MPa in the presence of NaOH and Ru/Al2O3 as catalysts, respectively. Up to 60 mol.{\%} of H2 gas was produced with NaOH as catalyst, and 53.7 mol.{\%} CH4 gas was produced in the presence of Ru/Al2O3.",
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Recovery of carbon fibres and production of high quality fuel gas from the chemical recycling of carbon fibre reinforced plastic wastes. / Yildirir, Eyup; Onwudili, Jude; Williams, Paul T .

In: Journal of Supercritical Fluids, Vol. 92, 31.08.2015, p. 107-114.

Research output: Contribution to journalArticle

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T1 - Recovery of carbon fibres and production of high quality fuel gas from the chemical recycling of carbon fibre reinforced plastic wastes

AU - Yildirir, Eyup

AU - Onwudili, Jude

AU - Williams, Paul T

N1 - © 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

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Y1 - 2015/8/31

N2 - A solvolysis process to depolymerize the resin fraction of carbon fibre reinforced plastic waste to recover carbon fibre, followed by hydrothermal gasification of the liquid residual product to produce fuel gas was investigated using batch reactors. The depolymerisation reactions were carried out in ethylene glycol and ethylene glycol/water mixtures at near-critical conditions of the two solvents. With ethylene glycol alone the highest resin removal of 92.1% was achieved at 400 °C. The addition of water to ethylene glycol led to higher resin removals compared to ethylene glycol alone. With an ethylene glycol/water ratio of 5, at 400 °C, resin removal was 97.6%, whereas it was 95.2% when this ratio was 3, at the same temperature. The mechanical properties of the recovered carbon fibre were tested and showed minimal difference in strength compared to the virgin carbon fibre. The product liquid, containing organic resin degradation products was then subjected to catalytic supercritical water gasification at 500 °C and 24 MPa in the presence of NaOH and Ru/Al2O3 as catalysts, respectively. Up to 60 mol.% of H2 gas was produced with NaOH as catalyst, and 53.7 mol.% CH4 gas was produced in the presence of Ru/Al2O3.

AB - A solvolysis process to depolymerize the resin fraction of carbon fibre reinforced plastic waste to recover carbon fibre, followed by hydrothermal gasification of the liquid residual product to produce fuel gas was investigated using batch reactors. The depolymerisation reactions were carried out in ethylene glycol and ethylene glycol/water mixtures at near-critical conditions of the two solvents. With ethylene glycol alone the highest resin removal of 92.1% was achieved at 400 °C. The addition of water to ethylene glycol led to higher resin removals compared to ethylene glycol alone. With an ethylene glycol/water ratio of 5, at 400 °C, resin removal was 97.6%, whereas it was 95.2% when this ratio was 3, at the same temperature. The mechanical properties of the recovered carbon fibre were tested and showed minimal difference in strength compared to the virgin carbon fibre. The product liquid, containing organic resin degradation products was then subjected to catalytic supercritical water gasification at 500 °C and 24 MPa in the presence of NaOH and Ru/Al2O3 as catalysts, respectively. Up to 60 mol.% of H2 gas was produced with NaOH as catalyst, and 53.7 mol.% CH4 gas was produced in the presence of Ru/Al2O3.

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