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High-Temperature Chemistry of Polypr...

Sidhu, Nathan Arjun Singh.

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High-Temperature Chemistry of Polypropylene Pyrolysis: Millisecond Reaction Kinetics and Visualization.

Record Type:	Electronic resources : Monograph/item
Title/Author:	High-Temperature Chemistry of Polypropylene Pyrolysis: Millisecond Reaction Kinetics and Visualization./
Author:	Sidhu, Nathan Arjun Singh.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	188 p.
Notes:	Source: Dissertations Abstracts International, Volume: 85-02, Section: B.
Contained By:	Dissertations Abstracts International85-02B.
Subject:	Chemical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30527421
ISBN:	9798379958145

High-Temperature Chemistry of Polypropylene Pyrolysis: Millisecond Reaction Kinetics and Visualization.
Sidhu, Nathan Arjun Singh.

High-Temperature Chemistry of Polypropylene Pyrolysis: Millisecond Reaction Kinetics and Visualization. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 188 p.

Source: Dissertations Abstracts International, Volume: 85-02, Section: B.

Thesis (Ph.D.)--University of Minnesota, 2023.

This item must not be sold to any third party vendors.

The ubiquity of plastics in modern life is evident by the rapid and continual growth of global plastic production. Polypropylene is one of the most widely produced and used plastic materials, accounting for approximately 20% of global polymer production. Billions of tons of plastic waste have been produced as a byproduct of the widespread use of plastics and are insufficiently managed under the current linear plastic economy, with the majority of plastic waste accumulating in landfills or the environment. To allow for the continued use of plastics in a sustainable fashion, a transition must be made towards a circular plastic economy, wherein end-of-life plastics are recycled in a closed loop, fully regenerating the original polymers. To realize a circular plastic economy, new recycling techniques must be developed. Pyrolysis, the thermal conversion of a material in an inert atmosphere, is a high-potential technology to help enable a circular plastic economy. Currently, the fundamental understanding of plastic pyrolysis is limited but will be essential for the development of industrially relevant waste management solutions.{A0}The quantification of the intrinsic reaction kinetics of plastic pyrolysis is an ongoing challenge, owing to the complexity of pyrolysis chemistry and the limitations of existing analytical techniques. In this work, a new Pulse-Heated Analysis of Solid Reactions (PHASR) technique was developed that is uniquely capable of operation under reaction-controlled conditions absent transport limitations to measure the millisecond intrinsic kinetics of polyolefin pyrolysis. The capabilities of this reactor to pyrolyze polyolefins under kinetically limited, isothermal conditions with millisecond scale control were extensively validated. A second, Visual PHASR reactor system was developed that enables in situ observation of reaction polyolefins via high-speed photography.{A0}Observations of reacting polyolefins revealed the presence of reaction phenomena, including a potential Leidenfrost effect. The intrinsic millisecond reaction kinetics of polypropylene pyrolysis were successfully quantified. The overall reaction kinetics were described by a lumped first-order consumption model with an activation energy of 242.0 {phono}{lstrok} 2.9 kJ mol-1 and a pre-exponential factor of 35.5 {phono}{lstrok} 0.6 ln(s-1 ). Additionally, the production of the solid residues formed during polypropylene pyrolysis was investigated, revealing a secondary kinetic regime.

ISBN: 9798379958145Subjects--Topical Terms:

560457
Chemical engineering.
Subjects--Index Terms:

Flash pyrolysis

High-Temperature Chemistry of Polypropylene Pyrolysis: Millisecond Reaction Kinetics and Visualization.
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100 1 $a Sidhu, Nathan Arjun Singh. $3 3764355
245 1 0 $a High-Temperature Chemistry of Polypropylene Pyrolysis: Millisecond Reaction Kinetics and Visualization.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 188 p.
500 $a Source: Dissertations Abstracts International, Volume: 85-02, Section: B.
500 $a Advisor: Dauenhauer, Paul J.
502 $a Thesis (Ph.D.)--University of Minnesota, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a The ubiquity of plastics in modern life is evident by the rapid and continual growth of global plastic production. Polypropylene is one of the most widely produced and used plastic materials, accounting for approximately 20% of global polymer production. Billions of tons of plastic waste have been produced as a byproduct of the widespread use of plastics and are insufficiently managed under the current linear plastic economy, with the majority of plastic waste accumulating in landfills or the environment. To allow for the continued use of plastics in a sustainable fashion, a transition must be made towards a circular plastic economy, wherein end-of-life plastics are recycled in a closed loop, fully regenerating the original polymers. To realize a circular plastic economy, new recycling techniques must be developed. Pyrolysis, the thermal conversion of a material in an inert atmosphere, is a high-potential technology to help enable a circular plastic economy. Currently, the fundamental understanding of plastic pyrolysis is limited but will be essential for the development of industrially relevant waste management solutions.{A0}The quantification of the intrinsic reaction kinetics of plastic pyrolysis is an ongoing challenge, owing to the complexity of pyrolysis chemistry and the limitations of existing analytical techniques. In this work, a new Pulse-Heated Analysis of Solid Reactions (PHASR) technique was developed that is uniquely capable of operation under reaction-controlled conditions absent transport limitations to measure the millisecond intrinsic kinetics of polyolefin pyrolysis. The capabilities of this reactor to pyrolyze polyolefins under kinetically limited, isothermal conditions with millisecond scale control were extensively validated. A second, Visual PHASR reactor system was developed that enables in situ observation of reaction polyolefins via high-speed photography.{A0}Observations of reacting polyolefins revealed the presence of reaction phenomena, including a potential Leidenfrost effect. The intrinsic millisecond reaction kinetics of polypropylene pyrolysis were successfully quantified. The overall reaction kinetics were described by a lumped first-order consumption model with an activation energy of 242.0 {phono}{lstrok} 2.9 kJ mol-1 and a pre-exponential factor of 35.5 {phono}{lstrok} 0.6 ln(s-1 ). Additionally, the production of the solid residues formed during polypropylene pyrolysis was investigated, revealing a secondary kinetic regime.
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650 4 $a Chemistry. $3 516420
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653 $a Flash pyrolysis
653 $a Kinetics
653 $a Polypropylene
653 $a PHASR
653 $a Recycling
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690 $a 0795
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710 2 $a University of Minnesota. $b Chemical Engineering. $3 1021870
773 0 $t Dissertations Abstracts International $g 85-02B.
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791 $a Ph.D.
792 $a 2023
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30527421