A New Technique for Production of Short-chain α, ω-Dicarboxylic Acids by Oxidative Degradation of Nylons with NO{sub}2 in scCO{sub}2

摘要

Applying supercritical carbon dioxide (scCO{sub}2) as a reaction medium, and choosing NO{sub}2 as an oxidant, 7 typical nylons (nylon-6; -11; -12; -4,6; -6,6; -6,9 and -6,12) were aimed to oxidatively degrade in order to obtain valuable chemical resources. Any of different types of nylons used in this study was successfully decomposed with NO{sub}2 in scCO{sub}2 under relatively mild conditions (140°C, 1 h, and 11 MPa), and aliphatic α, ω-diacids such as succinic, g lutaric and adipic acids were obtained in good yields.