首页|Development of chromatographic process for the dynamic separation of ~(90)Sr from high level liquid waste through breakthrough curve simulation and thermal analysis
Development of chromatographic process for the dynamic separation of ~(90)Sr from high level liquid waste through breakthrough curve simulation and thermal analysis
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NSTL
4',4'(5'')-Di(tert-butylcyclohexano)-18-crown-6 (DtBuCH18C6) modified with dodecyl benzenesulfonic acid (DBS) and 1-dodecanol was impregnated into silica-based polymer support (SiO2-P). The stability of adsorbent was evaluated according to thermal decomposition and leakage property. The leakage of total organic carbon (TOC) and dodecyl benzenesulfonic acid from the adsorbent was approximately constant and was below 2.26 wt % at 298 K at 0.5-7 M HNO3. The O 1s and Sr 3p XPS spectra of the adsorbent after adsorption of Sr(II), suggesting that strong binding interaction of Sr(II) and oxygen in DtBuCH18C6. The adsorbent containing DBS promoted the adsorption of Sr(II) compared to the DBS-free one, demonstrating the DBS worked as a counter ion. By adsorption kinetic and isotherm analyses, linear driving force expression with external mass coefficient (K_(fa)) and Freundlich model was found to be appropriate for the accurate description of adsorption dynamics. The separation column was designed by numerical thermal analysis and simulating breakthrough curve based on the short column data. Mathematical adsorption dynamics model was built, thereby obtaining the breakthrough curve of scale-up column. Thermal analysis was conducted due to the large heat value per unit adsorbent volume of 2292.877 W/m~3. The effect of column length and diameter on breakthrough curve and temperature field was further computationally discussed. Thus, a preliminary design for Sr(II) processing column (Φ150 mm × H700 mm, breakthrough time: 9.55 h, processing volume: 76.92 dm~3/cycle) from high-level liquid waste was proposed.
NSTL
