Study on the Properties of Plastic Fillers in Carbon Dioxide Capture System Under High Temperature and High Pressure

In the CO2-amine solution system, metal packings in purification devices face corrosion risks, while plastic packings have garnered attention due to their lightweight nature, ease of processing, and excellent corrosion resistance. Since different plastic packings have varying applicable temperature ranges, exceeding their tolerance limits can significantly reduce their corrosion resistance. Therefore, selecting suitable plastic packings at different temperatures is crucial for ensuring safety. This study selected four plastic materials–PVC-C, PP, FEP, and PEEK–and systematically tested their performance indicators, such as volume, mass, strength, elongation, and thermal stability, in a CO2-amine solution system at experimental temperatures ranging from 60 to 130 °C. The experimental results show that PEEK outperformed the other three materials within the 60–130 °C range, making it suitable as a packing material for purification devices in high-temperature environments. Although FEP demonstrated good performance under the same conditions, its tendency to deform may limit its applicability. PP and PVC-C exhibited poor performance at high temperatures, with PVC-C particularly failing above 100 °C, rendering it unsuitable for high-temperature applications. This research provides important insights for the future selection of packing materials in CO2-amine solution systems for purification devices.