“…NMP is mainly used in many industries, such as petrochemical industry, pharmaceutical industry, 2 , 3 pesticide, 4 dye, 5 , 6 and lithium-ion battery. It is widely used in extraction of aromatics, purification of olefins, etc., 7 and also used in the production of polyphenylene sulfide, polyamide, and other polymer engineering plastics, 8 , 9 as well as insulation materials, 10 , 11 pigment and detergent, 12 etc. Polyphenylene sulfide (PPS) is a special engineering plastic with high added value and application prospect in the world, 13 , 14 known as the sixth largest engineering plastic, with ultrahigh cost performance.…”