| Abstract [eng] |
The ongoing issue of marine plastic waste causing eutrophication and water pollution underscores the need for eco-friendly solutions. Collected waste materials can potentially serve as an alternative feedstock, generating higher-value energy products. Additionally, the recovery of caprolactam from nylon 6 waste fishing nets has the potential to conserve resources, enhance waste economics, and establish a closed loop in the fishing net industry's circular economy. This study focuses on investigating the pyrolysis process and the impact of catalyst interactions at varying temperatures on resulting products, contributing to circular economy efforts. We examine used fishing nets through TGA-DTG-FTIR analysis and a mini pyrolysis plant. Y-type zeolite and ZSM-5 were used as catalysts, with ratios of 1:3 and 1:8, respectively. Initial micro-thermal analysis characterized the feedstock, revealing minor decomposition at around 200 °C and a significant peak at 450 °C, resulting in an 88 wt.% weight loss. Analysis of pyro-oils revealed fractions rich in aromatic and aliphatic hydrocarbons like naphthalene, styrene, and toluene. Furthermore, caprolactam recovery yields not only energy products but also higher-value chemical derivatives. The combined influence of temperature and catalysts indicated that the optimal condition for generating the purest, highest-quality products is 700 °C. Based on the findings, catalytic thermal treatment at 700 °C with Y-Type catalyst holds promise as an effective method for caprolactam extraction with a substantial yield (96%). |
