Monday, September 26, 2022
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A sustainable approach of recycling polyamides: dissolution and ammonolysis of polyamides to diamines and diamides utilizing ammonia and biosourced glycerol


With a purpose to make recycling a viable technique for post-consumer plastics, economically possible revalorization processes have to be developed. The ammonolysis of polyamides will be such a cutting-edge recycling expertise; nevertheless, as a result of inflexible construction of those polyamide plastics, working situations of present ammonolysis processes are harsh, together with excessive temperatures (>300 °C) and excessive NH3 pressures. Right here, we report a really inexperienced and stylish ammonolysis means of the broadly considerable polyamide 66 by utilizing a tough Lewis acid catalyst and 1 bar of NH3 in a easy glycol solvent at 200 °C. Computational research revealed that particularly the vicinal diol moiety of those glycol solvents performs a key function in activation of the ammonia nucleophile, with glycerol being the simplest solvent, reaching the depolymerization equilibrium after 20 h even and not using a catalyst. To our delight, a biosourced glycerol (obtained from the saponification of triglycerides) might additionally instantly function an acceptable solvent, even outperforming the ammonolysis course of in extremely purified glycerol.

Graphical abstract: A sustainable way of recycling polyamides: dissolution and ammonolysis of polyamides to diamines and diamides using ammonia and biosourced glycerol

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