02254nas a2200181   4500008004100000022001400041245016600055210006900221260001000290300001600300490000700316520152600323100002401849700003201873700002501905700001901930856012301949       2025                        eng d  a0888-588500aHighly efficient, co-solvent assisted glycolytic depolymerization of waste polyethylene terephthalate (PET) into Bis(2-hydroxyethyl) terephthalate (BHET) monomer0 aHighly efficient cosolvent assisted glycolytic depolymerization   cAUG 2  a16428-164410 v643 a<p>
	Recently, growing use of plastics has led to the accumulation of waste that must be dealt with paramount priority. Among all plastic wastes, polyethylene terephthalate (PET) is the most widely used thermoplastic polyester globally because of its extensive applications in packaging, automotive manufacturing, and textile markets. Thus, there is a need to develop a sustainable and viable PET recycling process. This study presents an efficient solvothermal process for the depolymerization of PET into bis(2-hydroxyethyl) terephthalate (BHET) using co-solvent assisted glycolysis. The process uses N-methylimidazole (NMI) as a cosolvent with ethylene glycol (EG), achieving complete PET conversion and 92% BHET yield under optimized reaction conditions (180 degrees C, 45 min, PET:EG:NMI ratio of 1:7:8) without using a catalyst. The effectiveness of the cosolvent system was attributed to its polarity and H-bonding capabilities, which enhanced polymer swelling and facilitated the depolymerization. SEM analysis revealed pore formation in the NMI-treated PET, whereas FTIR studies confirmed the progressive formation of ester groups during depolymerization of PET. Kinetics studies based on different models indicated that, at higher temperatures, the surface reaction and homogeneous model proved to be rate-controlling due to the elimination of mass transfer limitations. A preliminary technoeconomic analysis and recyclability experiments further supported the scalability potential of the present study.</p>
1 aMarkandeya, Nishant1 aSolanki, Bhanupratap, Singh1 aRamalingam, Karthick1 aKamble, Sanjay  uhttps://library.ncl.res.in/content/highly-efficient-co-solvent-assisted-glycolytic-depolymerization-waste-polyethylene02648nas a2200241   4500008004100000022001400041245014700055210006900202260000800271300001100279490000800290520179100298653002302089653001302112653001802125653003302143100002402176700001802200700002102218700002502239700001902264856012302283       2026                        eng d  a0957-582000aSolvent-assisted chemical recycling of polycarbonate using glycerol as a renewable chemical: mechanistic insights and statistical optimization0 aSolventassisted chemical recycling of polycarbonate using glycer  cMAR  a1085920 v2093 a<p>
	The rapid accumulation of polycarbonate (PC) waste has driven the development of efficient recycling methods. This study presents a comprehensive investigation of solvent-assisted chemical recycling of PC using glycerol, a renewable chemical derived from industrial waste streams. Solvent screening highlighted the critical influence of solvent properties such as dielectric constant, dipole moment and hydrogen-bond accepting ability on depolymerization efficiency. A systematic approach combining Design of Experiments (DoE) and Response Surface Methodology (RSM) was employed to optimize the depolymerization process. Using a Box-Behnken design (BBD), the effects of key process parameters, including temperature, reaction time and the glycerol (GLY:PC) and dimethylformamide (DMF:PC) weight ratios, were evaluated in terms of PC conversion and bisphenol A (BPA) yield. The optimization model predicted that a reaction temperature of 171 degrees C, a reaction time of 1 h and a PC: GLY:DMF ratio of 1:5.05:7.22 would yield 100 % PC conversion and 85 % BPA yield. Experimental validation under these conditions achieved 100 % PC conversion and 83 % BPA yield, confirming the reliability of the model. Product characterization using NMR, LC-HRMS and FTIR confirmed the purity of BPA and provided insights into the reaction mechanism. The solvent recyclability across successive reaction cycles demonstrated the environmental and economic viability of the process. Overall, the energy demand calculation based on the environmental energy impact factor (xi) highlights the industrial relevance of this work and demonstrate an efficient and environmentally friendly catalyst-free route for depolymerization of polycarbonate with strong potential for industrial implementation.</p>
10aChemical Recycling10aGlycerol10aPolycarbonate10aResponse surface methodology1 aMarkandeya, Nishant1 aJadhav, Mayur1 aGopale, Prafulla1 aRamalingam, Karthick1 aKamble, Sanjay  uhttps://library.ncl.res.in/content/solvent-assisted-chemical-recycling-polycarbonate-using-glycerol-renewable-chemical