To evaluate the recycle of Ny6, the energy consumption for the production of virgin Ny6 resin was compared with that of recycled Ny6 resin by LCI analysis.
As a large amount of ammonium sulfate is produced as a by-product with virgin Ny6 from the same process, consumed energy and airborne emissions must be allocated to both products. The calculation result showed that the energy consumption for the production of virgin Ny6 was 170.7MJ/kg by the allocation method based on their prices. It was almost the same as the energy consumption of virgin Ny6 allocating all consumed energy to it, which was 177.8MJ/kg. Meanwhile, the energy consumption for the production of recycling Ny6 resin was 77.0MJ/kg. It was thought that the recycle of Ny6 had an advantage compared with virgin Ny6 from the viewpoint of the energy consumption. It should be noted that this analysis did not include the energy consumption to recover Ny6 textile and the weight loss at the degradation process of recovered Ny6.