Selective Separation of Methylfuran and Dimethylfuran by Nonporous Adaptive Crystals of Pillararenes
journal contributionposted on 09.11.2020, 20:15 by Yitao Wu, Jiong Zhou, Errui Li, Mengbin Wang, Kecheng Jie, Huangtianzhi Zhu, Feihe Huang
The separation of 2-methylfuran (MeF) and 2,5-dimethylfuran (DMeF) mixtures is very important in the chemical industry. Herein, we offer a novel strategy for the separation of MeF and DMeF using nonporous adaptive crystals (NACs) of perethylated pillararene (EtP5), perethylated pillararene (EtP6), perbromoethylated pillararene (BrP5), and perbromoethylated pillararene (BrP6). We find that the crystals of EtP6 and BrP5 show remarkable selectivities for MeF in a 50:50 (v/v) MeF:DMeF mixture vapor, yielding purities of 94.0 and 96.3%, respectively. Single-crystal structures reveal that these different selectivities come from the different thermodynamic stabilities and binding modes of the host–guest complexes. Cycling experiments demonstrate that these crystals can be reused more than five cycles without loss of performance.