Abstract: To address the issue of low adsorption capacity and high cost associated with solid adsorbent 13X zeolite in removing 2-chloropentane from unpolymerized C5 oil, a series of acetamide modified 13X zeolite adsorbents were prepared by impregnation method to explore its adsorption and removal performance for 2-chloropentane. The mechanism of dechlorination in unpolymerized C5 oil was elucidated by means of low temperature nitrogen adsorption-desorption, temperature programmed desorption of ammonia, elemental analysis, Fourier transform infrared spectroscopy and molecular simulation techniques, and adsorption isotherms and kinetics of 2-chloropentaneon the modified samples were also determined. The results showed that the skeleton structure of the modified 13X zeolite was not destroyed, and the newly introduced carbonyl functional group had a strong hydrogen bond interaction with 2-chloropentane. When the concentration of acetamide impregnation was 0.75 mol/L, the total pore volume, pore size and the total acid content of the modified adsorbent were the largest, and the static adsorption capacity for 2-chloropentane was the highest,which was 107.5 mg/g. At 298 K, the adsorption of 2-chloropentane on the modified sample conforms to Langmuir isotherm adsorption and the adsorption process follows a pseudo-second-order kinetic model. The adsorption equilibrium constant K_L is 0.16 L/mg, and the kinetic constant K₂ is 8 058.04 g/(mg.h).

Key words: 13X zeolite, adsorptive dechlorination, 2-chloropentane, acetamide, unpolymerized C5