Subcritical water for recycling of plastic waste (polyurethane)
Polyurethane (PU) represents more than 7 % of global plastic production and is widely used in our daily life such as in sofa and mattress cushion, insulation, packaging, and many more applications. The proper end-of-life handling or disposal of the PU waste has become increasingly important consider...
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sg-ntu-dr.10356-1815282024-12-18T02:17:24Z Subcritical water for recycling of plastic waste (polyurethane) Oh, Wei Hong Hu Xiao (MSE) School of Materials Science and Engineering ASXHU@ntu.edu.sg Chemistry Engineering Other Polyurethane Subcritical water Recycling Degradation Ether Ester Hydrothermal Polyurethane (PU) represents more than 7 % of global plastic production and is widely used in our daily life such as in sofa and mattress cushion, insulation, packaging, and many more applications. The proper end-of-life handling or disposal of the PU waste has become increasingly important considering the environmental impact of plastic waste. PU foam represents about 65% of the total PU, which is one huge PU type that needs to be handled properly to ensure sustainability of the resources and environment. In this FYP project, subcritical water process has been used for treating ether and ester PU foam. This is done by using (i) high pressure reactor with heating and stirring function with the high pressure generated autogenously and (ii) hydrothermal Autoclave. The breakdown of the PU foam can be one way to minimize the large volume of the low-density PU foam, and at the same time potentially producing suitable products for subsequent reuse. Different parameters have been used in studying the effectiveness of subcritical water treatment for handling PU foam waste within 200 to 275 ℃. For instance, the N–H bonds within solid PU Ether were broken down and more effective degradation of solid PU Ether took place once the reaction temperatures were higher than 225 °C. The subcritical water process can be effective to a certain extent in breaking down both ether and ester PU foam, with much better effectiveness for ether PU foam. Further optimisation of the subcritical water process parameters could further improve the breakdown of PU foam. Bachelor's degree 2024-12-09T02:18:46Z 2024-12-09T02:18:46Z 2024 Final Year Project (FYP) Oh, W. H. (2024). Subcritical water for recycling of plastic waste (polyurethane). Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/181528 https://hdl.handle.net/10356/181528 en application/pdf Nanyang Technological University |
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Chemistry Engineering Other Polyurethane Subcritical water Recycling Degradation Ether Ester Hydrothermal Oh, Wei Hong Subcritical water for recycling of plastic waste (polyurethane) |
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Polyurethane (PU) represents more than 7 % of global plastic production and is widely used in our daily life such as in sofa and mattress cushion, insulation, packaging, and many more applications. The proper end-of-life handling or disposal of the PU waste has become increasingly important considering the environmental impact of plastic waste. PU foam represents about 65% of the total PU, which is one huge PU type that needs to be handled properly to ensure sustainability of the resources and environment.
In this FYP project, subcritical water process has been used for treating ether and ester PU foam. This is done by using (i) high pressure reactor with heating and stirring function with the high pressure generated autogenously and (ii) hydrothermal Autoclave. The breakdown of the PU foam can be one way to minimize the large volume of the low-density PU foam, and at the same time potentially producing suitable products for subsequent reuse.
Different parameters have been used in studying the effectiveness of subcritical water treatment for handling PU foam waste within 200 to 275 ℃. For instance, the N–H bonds within solid PU Ether were broken down and more effective degradation of solid PU Ether took place once the reaction temperatures were higher than 225 °C. The subcritical water process can be effective to a certain extent in breaking down both ether and ester PU foam, with much better effectiveness for ether PU foam. Further optimisation of the subcritical water process parameters could further improve the breakdown of PU foam. |
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Hu Xiao (MSE) |
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Hu Xiao (MSE) Oh, Wei Hong |
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Final Year Project |
author |
Oh, Wei Hong |
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Oh, Wei Hong |
title |
Subcritical water for recycling of plastic waste (polyurethane) |
title_short |
Subcritical water for recycling of plastic waste (polyurethane) |
title_full |
Subcritical water for recycling of plastic waste (polyurethane) |
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Subcritical water for recycling of plastic waste (polyurethane) |
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Subcritical water for recycling of plastic waste (polyurethane) |
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subcritical water for recycling of plastic waste (polyurethane) |
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Nanyang Technological University |
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2024 |
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https://hdl.handle.net/10356/181528 |
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