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Advanced Recycling of Mixed Plastic ...

Lu, Taofeng.

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Advanced Recycling of Mixed Plastic Waste Using Safer Solvents and Supercritical Water.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Advanced Recycling of Mixed Plastic Waste Using Safer Solvents and Supercritical Water./
作者:	Lu, Taofeng.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
面頁冊數:	174 p.
附註:	Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
Contained By:	Dissertations Abstracts International85-03B.
標題:	Plastics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30525962
ISBN:	9798380322638

Advanced Recycling of Mixed Plastic Waste Using Safer Solvents and Supercritical Water.
Lu, Taofeng.

Advanced Recycling of Mixed Plastic Waste Using Safer Solvents and Supercritical Water. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 174 p.

Source: Dissertations Abstracts International, Volume: 85-03, Section: B.

Thesis (Ph.D.)--University of Massachusetts Lowell, 2023.

Plastics are widely used because they are robust and cost-effective materials. However, improper disposal of plastics has become a serious environmental issue. Particularly, plastic waste is composed of different types of immiscible plastics and polymer additives. Conventional plastic recycling methods such as mechanical recycling cannot handle mixed plastics and usually lead to down-cycling, mainly due to the inferior properties of recycled products. To address this problem, hydrothermal liquefaction (HTL) and a solvent-based recycling process were researched in this PhD dissertation to convert plastic waste into valuable products using supercritical water or safer solvents. In HTL, reaction temperatures and reaction times were first studied on polyethylene-based ocean plastic waste. The polymer degradation mechanism was explored by characterizing the gas, oil, and solid products. In addition, a dissolution-precipitation process, coupled with density separation, was developed to extract acrylonitrile butadiene styrene (ABS) from toy waste using safer solvents and antisolvents. The properties and chemical composition of recovered ABS were compared to feedstock ABS for understanding if any degradation may take place during the dissolution-precipitation process. Compared to producing virgin ABS material, the dissolution-precipitation process could potentially reduce embodied energy by 58%. Finally, inspired by the remarkable performance of catalysts in hydrogenolysis and pyrolysis of polyolefins, catalytical hydrothermal liquefaction of plastic is investigated, with the goal to improve the energy efficiency and/or to fine tune the product selectivity converted from HTL. Results from this study would contribute to developing efficient and potentially profitable recycling methods for challenging heterogeneous plastic waste.

ISBN: 9798380322638Subjects--Topical Terms:

649803
Plastics.
Subjects--Index Terms:

Plastic recycling

Advanced Recycling of Mixed Plastic Waste Using Safer Solvents and Supercritical Water.
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520 $a Plastics are widely used because they are robust and cost-effective materials. However, improper disposal of plastics has become a serious environmental issue. Particularly, plastic waste is composed of different types of immiscible plastics and polymer additives. Conventional plastic recycling methods such as mechanical recycling cannot handle mixed plastics and usually lead to down-cycling, mainly due to the inferior properties of recycled products. To address this problem, hydrothermal liquefaction (HTL) and a solvent-based recycling process were researched in this PhD dissertation to convert plastic waste into valuable products using supercritical water or safer solvents. In HTL, reaction temperatures and reaction times were first studied on polyethylene-based ocean plastic waste. The polymer degradation mechanism was explored by characterizing the gas, oil, and solid products. In addition, a dissolution-precipitation process, coupled with density separation, was developed to extract acrylonitrile butadiene styrene (ABS) from toy waste using safer solvents and antisolvents. The properties and chemical composition of recovered ABS were compared to feedstock ABS for understanding if any degradation may take place during the dissolution-precipitation process. Compared to producing virgin ABS material, the dissolution-precipitation process could potentially reduce embodied energy by 58%. Finally, inspired by the remarkable performance of catalysts in hydrogenolysis and pyrolysis of polyolefins, catalytical hydrothermal liquefaction of plastic is investigated, with the goal to improve the energy efficiency and/or to fine tune the product selectivity converted from HTL. Results from this study would contribute to developing efficient and potentially profitable recycling methods for challenging heterogeneous plastic waste.
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650 4 $a Environmental engineering. $3 548583
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653 $a Plastic waste
653 $a Hydrothermal liquefaction
653 $a Safer solvents
653 $a Supercritical water
653 $a Antisolvents
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