硅烷试剂改性硅胶特性及柴油吸附性能研究  

STUDY ON CHARACTERISTICS OF SILICA GEL MODIFIED BY SILANE REAGENT AND ITS ADSORPTION PERFORMANCE OF DIESEL

作　　者：吕雪娇 王辉国 王德华 蒋志超 乔晓菲 LüXuejiao;Wang Huiguo;Wang Dehua;Jiang Zhichao;Qiao Xiaofei(SINOPEC Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100083)

机构地区：[1]中石化石油化工科学研究院有限公司,北京100083

出　　处：《石油炼制与化工》2024年第8期84-91,共8页Petroleum Processing and Petrochemicals

摘　　要：选择6种硅烷试剂对B型硅胶进行接枝改性,通过N 2吸附-脱附试验、固体红外光谱分析、热重与质谱联用分析、元素分析和甲苯吸附试验等表征手段探究吸附材料的物理和化学特性,结合静态吸附平衡试验探究吸附材料的柴油吸附性能。结果表明:氨基、巯基和环氧基基团可以和硅胶成功接枝,改性后硅胶的比表面积、总孔体积、最可几孔径和平均孔径均减小,甲苯吸附量与改性硅胶比表面积呈正相关关系。根据改性硅胶中氮元素质量分数的不同计算得出,硅胶改性反应的程度与硅烷试剂的选择有关。静态试验结果表明:6种硅烷试剂中,氨基和环氧基改性硅胶能提高吸附剂对双环芳烃的选择性,同时提高对柴油中含硫化合物的选择性;巯基改性硅胶能降低吸附剂对含硫化合物的选择性;而氨基、巯基和环氧基改性硅胶均能降低吸附剂对单环芳烃的选择性。Six kinds of silane reagents were selected for grafting modification of B-type silicone,the physical and chemical characteristics of adsorption materials were investigated by means of nitrogen adsorption-desorption test,solid-state infrared spectroscopy analysis,thermogravimetric and mass spectrometry analysis,elemental analysis,and toluene adsorption test,and the adsorption performance of diesel was studied by static adsorption equilibrium test.The results showed that amino group,sulfhydryl group and epoxy group could be successfully grafted onto silica gel;the specific surface area,total pore volume,most probable pore size,and average pore size of the modified silica gel all decreased;the adsorption amount of toluene was positively correlated with the specific surface area of modified silica gel.According to the different content of nitrogen in modified silicone,the degree of modification reaction was related to the selection of silane reagent.The static test results showed that among the six silane reagents,the amino and epoxy group modified silica gel could improve the selectivity of the adsorbent for bicyclic aromatic hydrocarbons,and could significantly improve the selectivity of the adsorbent for sulfur compounds in diesel fraction.Sulfhydryl modified silica gel could reduce the selectivity of the adsorbent for sulfur compounds,while amino,thiol and epoxy modified silica gel all reduced the selectivity of the adsorbent for monocyclic aromatic hydrocarbons.

关 键 词：柴油 吸附分离 改性硅胶 硅烷试剂 选择性 

分 类 号：TE624.54[石油与天然气工程—油气加工工程]