Researchers in Japan have developed a method that reduces the energy needed to recycle Teflon by 50%, using an electron beam to break down the highly durable plastic. The technique fully decomposes the material at 370\u202f\u00b0C (698 \u00b0F), a temperature significantly lower than that current industrial processes require.<\/p>\n
Their study details a process that could improve the economic feasibility of recycling polytetrafluoroethylene (PTFE), the chemical compound known as Teflon.\u00a0<\/p>\n
The National Institutes for Quantum Science and Technology (QST) research team reports that their method could cut the energy cost of recycling\u2014which currently stands at 2.8 to 4 MWh per ton for conventional pyrolysis\u2014in half. Pyrolysis typically requires 600\u22121000\u202f\u00b0C (1112 \u00b0F \u2013 1832 \u00b0F).<\/p>\n
\u201cBy applying heat during irradiation, we were able to reduce the energy required to decompose PTFE by 50% compared to traditional methods,\u201d said Dr. Akira Idesaki, the senior principal researcher on the project.<\/p>\n
\u201cThis makes large-scale recycling of fluoropolymers much more viable.\u201d<\/p>\n
Irradiating PTFE at different temperatures<\/p>\n
The technique\u2019s effectiveness stems from combining moderate heat with electron beam irradiation.\u00a0<\/p>\n
The study found that while irradiating PTFE at room temperature (30\u202f\u00b0C or 86 \u00b0F) decomposed only 10% of the material, the decomposition rate rose to 86% at 270\u202f\u00b0C (518 \u00b0F) and reached 100% at 370\u202f\u00b0C (698 \u00b0F).<\/p>\n
\u201cWhen PTFE powder was irradiated with a dose of 5 MGy at 30\u202f\u00b0C, only 10% decomposed. But at 270\u202f\u00b0C, that number rose to 86%. At 370\u202f\u00b0C, full decomposition was achieved,\u201d explained<\/a> the researchers.<\/p>\n This process converts the solid PTFE into gaseous products, identified as oxidized fluorocarbons and perfluoroalkanes. According to the researchers, these gases could potentially be collected and used as raw materials in chemical manufacturing, supporting a circular use of resources.<\/p>\n Alters internal structure of plastic<\/p>\n The study also noted that the process alters the internal structure of the plastic.\u00a0<\/p>\n \u201cHigh-temperature irradiation not only enhances decomposition but also changes the internal structure of PTFE,\u201d said Dr. Hao Yu, the paper\u2019s first author.\u00a0<\/p>\n This structural change is a factor in the increased efficiency of the process at higher temperatures.<\/p>\n