实验技术与管理

该实验设计将双金属乙酸盐与2,5-二羟基对苯醌（dhbq）配位合成一维聚合物吸附材料Mn/Fe-dhbq，并运用于二甲苯吸附分离。实验构建“材料合成—结构表征—吸附分离—机理分析”全流程教学体系，融合无机化学、有机化学、化工原理等多学科知识。通过常温聚合反应、XRD/SEM/BET现代测试表征技术及静态与动态吸附实验，探究双金属配合物材料孔结构及吸附分离性能，并基于四塔固定床液相吸附实验装置，模拟二甲苯异构体混合液的工业吸附分离工艺。实验设计突出探究性和工程性，通过吸附动力学（一级/二级模型拟合）分析深化理论认知，结合二甲苯异构体分离难点培养创新思维。该综合实验不仅训练学生仪器操作与数据分析能力，还通过“工业问题—实验设计—方案优化”的实践链条，提升其解决复杂工程问题的能力，是化工专业兼具学科交叉性与实践创新性的教学范例。

[Objective] The dual goals of this experimental design are teaching and scientific research. For teaching purposes, it creates a comprehensive system that covers material synthesis, structural characterization, adsorption separation, and mechanism analysis. This system integrates interdisciplinary knowledge, overcomes the limitations of traditional experiments, and enhances the problem-solving abilities of chemical engineering students. For scientific research, the experiment synthesizes the one-dimensional polymer adsorbent Mn/Fe-dhbq and explores its adsorption and separation mechanism for xylene isomers. It also simulates industrial separation processes and emphasizes the exploration and engineering nature to cultivate students' innovative thinking. [Methods] The experiment consists of four modules:(1) Material synthesis: A room-temperature coordination polymerization process using bimetallic acetate and DHBQ(2,5-dihydroxy-p-benzoquinone) is adopted to prepare Mn/Fe-DHBQ;(2) Structural characterization: X-ray diffraction, scanning electron microscopy, and Brunauer–Emmett–Teller are applied to analyze the material's crystal structure, morphology, and pore structure;(3) Adsorption performance investigation: Static experiments measuring adsorption capacity and equilibrium time and dynamic experiments simulating industrial processes with a four-column fixed bed are combined, and the data are fitted using first-order and second-order kinetic models;(4) Teaching: A progressive connection of “theory–operation–data–mechanism” is adopted to transform theoretical knowledge into practical ability. [Results] Material synthesis and characterization results show that Mn/Fe-DHBQ has high purity, a uniform microscopic morphology, a large specific surface area, and a reasonable pore size distribution. Adsorption performance experiments indicate that the material has excellent adsorption capacity and selectivity for xylene isomers. The purity of the effluent from the four-column, fixed-bed separation is high. The second-order kinetic model has a higher degree of fit. In teaching practice, more than 80% of students can operate instruments independently. They can also proficiently fit data and propose process optimization ideas. Thus, they can initially acquire the ability to solve engineering problems. [Conclusions] The Mn/Fe-dhbq material exhibits excellent adsorption and separation performance, and the four-column fixed-bed process has industrial application potential. The experimental teaching system effectively addresses the shortcomings of traditional teaching methods, improving students' comprehensive abilities. This design connects basic research with industrial applications and provides a model for reforming experimental teaching in chemical engineering majors. It also offers a new direction for upgrading the xylene separation industry, achieving the dual goals of teaching and scientific research.