乙酰胺改性13X分子筛的制备及其脱除2-氯戊烷性能  

PREPARATION OF ACETAMIDE MODIFIED 13X ZEOLITE AND ITS PERFORMANCE IN REMOVING 2-CHLOROPENTANE

作　　者：任文瑞 周广林[1] 李汝晗 姜伟丽[1] 王仲戎 李继聪 宣守国 崔玉鑫 Ren Wenrui;Zhou Guanglin;Li Ruhan;Jiang Weili;Wang Zhongrong;Li Jicong;Xuan Shouguo;Cui Yuxin(College of New Energy and Materials,China University of Petroleum,Beijing 102249)

机构地区：[1]中国石油大学(北京)新能源与材料学院,北京102249

出　　处：《石油炼制与化工》2024年第12期13-21,共9页Petroleum Processing and Petrochemicals

摘　　要：为解决固体吸附剂13X分子筛对未聚碳五油中2-氯戊烷吸附容量低、吸附成本高的问题,采用浸渍法制备了一系列乙酰胺改性13X分子筛吸附剂,探究其对2-氯戊烷的吸附脱除性能。利用低温氮气吸附-脱附、氨气程序升温脱附、元素分析、傅里叶变换红外光谱等表征手段和分子模拟技术阐明未聚碳五油的脱氯机理,同时测定改性样品对2-氯戊烷的吸附等温线和吸附动力学特性。研究结果表明:改性后13X分子筛的骨架结构未被破坏,新引入的羰基官能团与2-氯戊烷吸附产生了较强的氢键相互作用。当乙酰胺浸渍液浓度为0.75 mol/L时,改性后吸附剂总孔体积、孔径和总酸量最大,对2-氯戊烷的静态吸附容量最高,为107.5 mg/g,吸附过程既存在物理吸附也存在化学吸附。298 K下该改性样品对2-氯戊烷的吸附符合Langmuir等温吸附并且吸附过程符合拟二级动力学模型,吸附平衡常数K_(L)为0.16 L/mg,动力学常数K_(2)为8058.04 g/(mg·h)。To address the issue of low adsorption capacity and high cost associated with solid adsorbent 13X zeolite in removing 2-chloropentane from unpolymerized C_(5)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 C_(5)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-chloropentane on 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 K_(2)is 8058.04 g/(mg·h).

关 键 词：13X分子筛 吸附脱氯 2-氯戊烷 乙酰胺 未聚碳五 

分 类 号：TQ424.25[化学工程]