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(510f) Solvent Template-Directed Synthesis of Flexible and Thermosensitive Metal-Organic Framework (CPL-1) for Highly Selective C3H6/C3H8 Separation

Authors: 
Xia, Q., South China University of Technology
Li, Z., South China University of Technology
Li, Y., South China University of Technology
Chen, Y., South China University of Technology
Lv, D., South China University of Technology
The separation of olefins from paraffin is important for the production of industrial chemicals. A flexible and thermosensitive microporous Metal-organic framework (CPL-1) was synthesized by a solvothermal method using various sized solvents as the template. The isotherms of propylene and propane on CPL-1 materials were measured by a volumetric method. Experiments of multiple adsorption-desorption cycles were conducted to estimate reversibility of propylene on CPL-1. Results showed the C3H6 isotherms of all samples showed a sudden rise at the threshold pressure and attained a saturated level rapidly, indicating that the structure of CPL-1 materials could expand in response to propylene molecule at 273 K. Whereas, CPL-1 materials were not responding to propane molecule. Therefore, CPL-1 demonstrated a highly selectivity towards C3H6 against C3H8. The solvents could be divided into two groups based on the kinetic diameters: the kinetic diameters of the solvents in one group are smaller than that of C3H6, those in the other are greater than that of C3H6. And C3H6 gate opening pressure of CPL-1 materials synthesized by different solvents reduced with the decreasing of the kinetic diameters of two groups of solvents, separately. Among them, CPL-1 synthesized in the solvent of CH2Cl2, which molecular size is slightly larger than propylene, performanced the lowest C3H6 gate opening pressure about P/P0=0.37. Itâ??s worth noting that the structure of thermosensitive CPL-1 could expand in response to propylene molecular at 273 K, but shrink at 298 K. Consecutive cycles of adsorption-desorption experiment showed that the desorption efficiency could reach 90% for five cycles at 298 K, P/P0=0.9, indicating that CPL-1 had excellent regeneration property of propylene at room temperature.