摘要
以加氢精制柴油为原料,在模拟移动床反应器中考察MgY芳烃吸附剂的分离性能。长周期运行830 d后,产品芳烃组分芳烃质量分数从98.6%降至84.7%,产品非芳组分芳烃质量分数从1.3%升至7.8%,分离性能下降明显,说明吸附剂出现失活现象。通过紫外漫反射仪(UV-Vis)、化学吸附仪(NH3-TPD)和热重分析仪(TGA)对失活吸附剂做了表征,并利用质量分数为40%的氢氟酸溶液分解失活剂骨架,添加四氯化碳超声萃取失活物质,通过X射线衍射仪(XRD)和气质联用仪(GC-MS)分析失活物质类型。失活物质主要是C10~C16带侧链单环、双环或三环芳烃,随着反应的进行芳烃不断累积,导致吸附剂极性位被覆盖进而失活,但不存在明显积炭现象。450℃再生后吸附剂的非芳烃/芳烃分离度与新鲜剂基本相同,吸附-脱附过程趋于平衡。
With hydrotreated diesel oil as raw material,the separating properties of MgY aromatic adsorbent in simulate moving bed reactor was investigated.After running a long cycle of 830 d,the mass fraction of aromatic in product decreased from98.6%to 84.7%,while the mass fraction of non-aromatic components increased from 1.3%to 7.8%.The separation performance was significantly reduced,and the adsorbent was inactivated.The deactivated adsorbent was characterized by UV-Vis,NH3-TPD and TGA.The framework structure of deactivating agent was decomposed by hydrofluoric acid solution of 40%(mass fraction),through the ultrasonic extraction carbon tetrachloride was added for extracting deactivated substances,the types of deactivation substance were analyzed by X-ray diffractometer(XRD)and GC-MS.The deactivated substances were mainly C10~C16 aromatics,including aromatics with side chains,double ring or tricyclic aromatic hydrocarbons.As the reaction progresses,the aromatic hydrocarbon on the adsorbent accumulated continuously,leading to the polar position being covered and deactivation,but there was no obvious carbon deposition on the adsorbent.Non-aromatic hydrocarbon/aromatic hydrocarbon separation of adsorbent recovered basically after regeneration at 450℃,adsorption-desorption process tended to equilibrium.
作者
赵闯
范景新
郭春垒
李犇
李滨
臧甲忠
汪洋
侯立伟
孙振海
Zhao Chuang;Fan Jingxin;Guo Chunlei;Li Ben;Li Bin;Zang Jiazhong;Wang Yang;Hou Liwei;Sun Zhenhai(Key Laboratory of Catalysis Technology,CenerTech Tianjin Chemical Research and Design Institute Co.,Ltd.,Tianjin 300131,China)
出处
《无机盐工业》
CAS
CSCD
北大核心
2020年第8期98-102,共5页
Inorganic Chemicals Industry
基金
中海油能源发展股份有限公司乙苯吸附剂及吸附工艺项目(E-J718TC14)。
关键词
模拟移动床
芳烃吸附剂
非芳烃/芳烃分离度
失活物质
simulated moving bed
aromatic adsorbent
non-aromatic/aromatic separation
deactivated substance
