咪唑类离子液体微胶囊的CO2吸附和扩散行为

摘要

Preparation of microcapsule-type immobilized ionic liquid by high-speed shearing method.It mainly studies the microstructure, CO2adsorption, CO2/N2selectivity, stability and CO2diffusion behavior of ionic liquid microcapsules.The results showed that the immobilized ionic liquid has microcapsule structure, and the particle size and microstructure integrity are the main factors affecting the CO2adsorption.BCE24-11 consisting of 24％gas-phase silica gel, 8.46％ionic liquid, 8.77％water and 8.77％glycol has a better CO2adsorption of 3.41％at 0.1 MPa and 293 K.This sample also has good equilibrium adsorption time (about 30 min), CO2/N2selectivity (17.05), stability and cycle performance.Compared with the Dsvalue of pure ionic liquid (10-11m2/s), the microcapsule structure loaded with ionic liquids has a faster rate of CO2diffusion.%采用高速剪切法,制备微胶囊型固载咪唑类离子液体,研究离子液体微胶囊的微观结构、CO2吸附量、CO2/N2选择性、稳定性以及CO2的扩散行为.结果表明,制备的离子液体微胶囊结构完整,且微观结构的完整性和粒径是影响CO2吸附量的主要因素.在0.1 MPa和298 K下,气相硅胶含量24％、离子液体58.46％、水含量8.77％、乙二醇含量8.77％的样品BCE24-11,其CO2吸附量为3.41％,达吸附平衡仅30 min,CO2/N2选择性为17.05,稳定性和循环使用性较好;与纯离子液体的扩散系数值(10-11m2/s)相比较,微胶囊型结构的固载离子液体具有更快的CO2的扩散速率.