Effectiveness of poly lactic acid chemical recycling system by using hydrothermal treatment based on life cycle inventory analysis
2009
Atsuta, Y.(Toyohashi univ. of Technology, Aichi (Japan)) | Shinbo, T. | Widianto, A. | Daimon, H. | Fujie, k.
For realization of the society which does not depend on depleted resources, and its carbon neutral point of view, poly lactic acid attracts attention as a biomass origin and expected the future wide-spread. However, the problem is such as competition against food, and higher energy consumption in production process compared with fossil resources based polymer. Therefore, the purpose of development technology for poly lactic acid chemical recycling system is to effective utilize biomass resources and to reduce energy consumption. One of the methods is hydrothermal reaction. However, effectiveness of chemical recycle system with the method was not evaluated yet. This study estimated the energy consumption and greenhouse gas emissions in three scenarios (land fill, thermal recycle, and chemical recycle using hydrothermal reaction) that treatment processes of used poly lactic acid products were compared for energy consumption and greenhouse gas emissions. These results indicated that the energy consumption of the scenario with chemical recycling by hydrothermal reaction has 30% less than that without the recycling. The chemical recycle system with the method by hydrothermal reaction has high effectiveness.
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