Chemical recycling of polycarbonate in high pressure high temperature steam at 573 K

CeO2 nanocatalysts for the chemical recycling of polycarbonate

“…S1). When PC materials simply depolymerize to its contexture monomer, CO 2 is also produced with BPA monomer [19,20,[23][24][25][26]. In this study, the CO 2 product is not monitored.…”

“…In this study, the CO 2 product is not monitored. Moreover, the further decomposition of BPA produces not only phenol but also phenol related compounds such as isopropylphenol and isopropenylphenol [18,[20][21][22][23][24][25][26]. While the further decomposition products excepting phenol are not identified, a further isopropylphenol decomposition product that can be purchased from Tokyo chemical was not detected by the HPLC analysis (Fig.…”

“…Regarding the chemical recycling of PC materials, the materials were depolymerized via hydrolysis in the presence of Na 2 CO 3 [18], NaOH [19], and manganese acetate [20] as catalytic reagents, via alcoholysis [21,22], and via glycolysis [23]. The chemical recycling of PC materials was also performed using high pressure and high temperature steam [24] or fluidized bed reactor via thermal pyrolysis [25] and via steam hydrolysis [26]. We have also developed techniques for the depolymerization of PC and PET having ester part to their monomers under hydrothermal conditions using subcritical water by a green chemistry process because water is non-toxic, abundant, and eco-friendly, and we evaluated the impact of homogeneous amine aqueous solutions on the depolymerization of the PC and PET samples.…”

Development of materials and technologies for control of polymer recycling

“…The PC was completely decomposed into BPA in steam at 300 1C within 5 min. 51 The maximum yield of BPA was about 80 mol% based on the starting PC, whereas the decomposition in liquid water at 300 1C gave about a 50% yield even after 30 min treatment. The high yield of BPA in HPS was due to the high stability of BPA in HPS compared with when in the liquid water phase, in which the further reaction of BPA progressed in acidic conditions, because CO 2 and BPA were dissociated to form ionic species.…”

Recent Advances in the Chemical Recycling of Polymers (PP, PS, LDPE, HDPE, PVC, PC, Nylon, PMMA)

“…Methanolysis mechanism for PC in the presence of ionic liquid [Bmim][Ac] [Liu et al, 2011]. Watanabe et al 2009, found that polycarbonate was rapidly hydrolyzed in high pressure high temperature steam around the saturated pressure of water at 573 K. For 300 s (5 min) reaction time, PC completely decomposed into bisphenol A and the maximum yield of BPA was around 80%. In liquid water phase at 573 K, PC still remained even for 3000 s (50 min).…”