关键词: 液相吸附分离, 二甲苯异构体, 金属有机框架, 成型, MIL-160

Abstract: Using hydroxypropyl cellulose (HPC) as a binder, MIL-160 powder was successfully fabricated into shaped pellets via a simple extrusion method. Structural characterization results indicate that the binder forms "connecting bridges" between MIL-160 crystals, tightly binding them together without causing significant structural damage or severe pore blockage. The MIL-160 pellets exhibit high adsorption capacity and high selectivity for m-xylene. As the binder content increases, the mechanical strength of the MIL-160 pellets improves, while the m-xylene adsorptive performance declines. Among them, the MIL-160@HPC-10% pellets exhibit the optimal balance of mechanical strength, adsorption separation performance, and thermal stability. Competitive adsorption experiments show that the saturated adsorption capacity of m-xylene on MIL-160@HPC-10% pellets is 0.8 mmol/g, with adsorption selectivities of 7.12 for m-xylene/o-xylene and 6.70 for m-xylene/p-xylene. Dynamic liquid-phase breakthrough experiments confirm that MIL-160@HPC-10% pellets possess high applicability and potential in practical industrial scenarios, with a dynamic adsorption capacity of 0.67 mmol/g for m-xylene. Furthermore, three consecutive in-situ adsorption/desorption cycles demonstrate that the pellets possess stable cyclic regeneration performance.

Key words: liquid-phase adsorptive separation, xylene isomers, metal-organic frameworks, shaping, MIL-160