Abstract
C4 olefins and paraffins separation is one of the great challenges of hydrocarbon separation because of the extremely similar physical properties. Herein we report two zeolitic materials based on vanadotungstates, vanadotungstates with cubic symmetry (VT-1) and vanadotungstates with trigonal symmetry (VT-5), with various cations, which effectively separate 1,3-butadiene/1-butene and 1,3-butadiene/n-butane. The structures and the cations of the materials both have influence on the static adsorption capacity, Henry selectivity, ideal adsorbed solution theory (IAST) selectivity, and dynamic separation performance. The separation efficiency is confirmed by the breakthrough measurements and the results show that high separation performances of 1,3-butadiene/1-butene and 1,3-butadiene/n-butane are achieved by VT-5 with trimethylamine cation (TMA-VT-5) simultaneously even at high temperatures. The robust material can be regenerated and reused without loss of the separation performance.
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