β-环糊精修饰淀粉基多孔树脂及高效分离C8芳烃和PO/SM副产物的研究

采用淀粉基吸附剂分离C8芳烃、PO/SM副产物（主要含有苯乙酮和1-苯乙醇）具有重要的研究意义，然而普通交联淀粉对目标底物选择性不高。前期研究表明β-环糊精对上述混合物中的邻二甲苯和苯乙酮分别具有最强的包结能力。本项目提出采用外交联法和化学键合法将β-环糊精引入淀粉基多孔骨架，通过β-环糊精与交联淀粉官能团协同作用和树脂孔效应提高吸附选择性，从而实现C8芳烃和PO/SM副产物的高效分离。通过开展吸附平衡和固定床吸附研究，推测吸附热力学参数，并探究多组份吸附平衡特性和竞争吸附作用机制。结合吸附实验和理论计算研究探讨吸附过程中的分子间弱相互作用的本质特征，并阐释β-环糊精对吸附选择性的增强机制。通过本研究，以期为实现生物基吸附材料分离提纯石化产品的工业化生产提供理论依据与实际指导。

It is of great significance for research on adsorptive separation of C8 aromatics and PO/SM by-product (mainly containing acetophenone and 1-phenylethanol) by starch based adsorbent. However, the conventional crosslinked starches usually exhibit low specificity toward the targeted adsorbates. Previous studies indicated that o-xylene and acetophenone can form more stable inclusion complexes with β-cyclodextrin compared to their analogues from the above two mixtures. This proposal intends to introduce β-cyclodextrin into the starch based porous framework through the external crosslinking strategy and means of chemical bonding. And the adsorption selectivity can be improved via the porous effect of resin as well as the synergistic effects based on the functional groups of β-cyclodextrin and crosslinked starch, thereby allowing efficient separation of C8 aromatics and PO/SM by-product. By conducting the adsorption equilibrium and fixed-bed adsorption experiments, the adsorption thermodynamic parameters can be calculated, moreover, the multi-solute adsorption equilibrium properties and competitive adsorption mechanisms can also be estimated from the data. Based on the comprehensive analyses of the theoretical calculation and experimental results, the intrinsic characteristics of intermolecular weak interactions involved in adsorption can be investigated, and the selectivity enhancement mechanism by β-cyclodextrin can be further elucidated. Through this study, we expect to provide the theoretical basis and the practical guidance for realizing industrial production in the separation and purification of petrochemical products by biosorbents.