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Separation of Aromatics/Cyclic Aliphatics by Nonporous Adaptive Pillararene Crystals
Ist Teil von
Angewandte Chemie (International ed.), 2018-09, Vol.57 (39), p.12845-12849
Auflage
International ed. in English
Ort / Verlag
Germany: Wiley Subscription Services, Inc
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The separation of cyclic aliphatics of high purity, which are produced from hydrogenation of the corresponding aromatics, is highly desired in the chemical industry. An energy‐efficient and environmentally friendly adsorptive separation method using nonporous adaptive crystals of perethylated pillar[5]arene (EtP5) and pillar[6]arene (EtP6) is described. Adaptive EtP5 crystals separate toluene from methylcyclohexane with 98.8 % purity, while adaptive EtP6 crystals separate methylcyclohexane from toluene with 99.2 % purity. The selectivities come from the stability of new EtP5 and EtP6 crystal structures upon capture of toluene and methylcyclohexane, respectively. The reversible transformations between nonporous guest‐free EtP5 or EtP6 structures and guest‐loaded structures make them highly recyclable.
Energy‐efficient separation of aromatics and cyclic aliphatics is a major industrial sustainability challenge. A flexible molecular material, namely nonporous adaptive crystals of pillararenes, can be used to separate them. Pillar[5]arene is shown to separate vapors of toluene from methylcyclohexane, while pillar[6]arene separates methylcyclohexane from toluene with over 98 % specificity in the solid state.