β-环糊精-纤维素基超交联微球吸附分离苯乙酮和1-苯乙醇

Adsorptive separation of acetophenone and 1-phenylethanol by β-cyclodextrin-cellulose based hypercrosslinked microspheres

摘要:

石化及生物化工过程经常产出富含苯乙酮(AP)和1-苯乙醇(PE)的混合产物,采用精馏、结晶等方法很难将二者分开。利用物理吸附法对AP和PE进行分离具有重要的意义。本文制备了一种b-环糊精-纤维素基超交联微球(HCCM),并用于吸附分离AP/PE。通过红外光谱仪(FT-IR)、氮气吸附-脱附、扫描电子显微镜(SEM)和透射电镜(TEM)对其结构进行了表征,结果表明HCCM是由大量的糖单元和富苯基单元交织形成的具有多级孔结构的生物质基聚合微球。对HCCM吸附分离AP/PE的性能进行研究,发现间歇吸附下吸附很快达到平衡,HCCM对AP有较高的吸附量且明显高于PE。连续吸附下PE较AP提前穿透,穿透间隔较长,并且有较高的分离因子,说明HCCM能有效地分离AP/PE。重复使用实验证明该材料具有良好的循环使用性。

Abstract:

The mixture of acetophenone (AP) and 1-phenylethanol (PE), usually produced in petrochemical and biochemical processes, are difficult to be separated by the traditional distillation, crystallization, etc. It is of great significance to separate AP and PE by physical adsorption. A kind of b-cyclodextrin-cellulose based hypercrosslinked microspheres (HCCM) was prepared and used to adsorb and separate AP/PE. The structure of HCCM was characterized by FT-IR, N₂ adsorption desorption, scanning electron microscopy and transmission electron microscopy. The results showed that HCCM was a biomass based polymer microsphere with hierarchically porous structure formed by interweaving a large number of sugar units and phenyl rich units. The performance of HCCM for the adsorption and separation of AP/PE was studied. It was found that the equilibrium could be reached quickly, and the adsorption capacity of AP was higher than that of PE. Furthermore, PE, broke through much earlier than AP, with a long breakthrough interval and a high separation factor, which indicate that HCCM can separate AP and PE effectively. The recycling experiment proved that the material possessed excellent reusability.