Inorganic Chemicals Industry >
Study on deactivation of diesel aromatic adsorbent
Received date: 2020-02-21
Online published: 2020-08-12
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 from 98.6% 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.
Chuang Zhao , Jingxin Fan , Chunlei Guo , Ben Li , Bin Li , Jiazhong Zang , Yang Wang , Liwei Hou , Zhenhai Sun . Study on deactivation of diesel aromatic adsorbent[J]. Inorganic Chemicals Industry, 2020 , 52(8) : 98 -102 . DOI: 10.11962/1006-4990.2019-0525
[1] | 张亚秦, 孙西巍, 徐瑞芳, 等. 煤制烯烃技术工业化进展及市场分析[J]. 山东化工, 2018,47(19):67-68. |
[2] | 米多. 国内外芳烃生产情况及市场供需价格分析[J]. 化学工业, 2017,35(5):59-64. |
[3] | 卢学斌, 李哲, 王健, 等. 柴油产品质量升级及降低柴汽比方案探讨[J]. 当代化工, 2019,48(6):1326-1329. |
[4] | 林毅辉, 包建国, 朱小顺, 等. 降低FCC柴汽比技术开发及应用[J]. 广州化工, 2018,45(8):107-109. |
[5] | 朱小顺, 杨海华, 伍小驹, 等. 降低催化装置柴汽比技术[J]. 广州化工, 2016,44(5):181-182. |
[6] | 张罗庚, 胡云涛, 简建超. 加氢装置降低柴汽比的优化措施[J]. 石油炼制与化工, 2017,48(7):60-63. |
[7] | 李文慧. ZSM-5分子筛催化剂上积碳物种的研究[D]. 大连:大连理工大学, 2014. |
[8] | 王祥生. 苯与丙烯液相烷基化合成异丙苯β沸石催化剂的失活[D]. 大连:大连理工大学, 2003. |
[9] | Helveg S, Lopez C, Schested J, et al. Atomicscale imaging of carbon nanoflbfie growth[J]. Nature, 2004,4(27):426-429. |
[10] | Larsen J H, Chorken D F. From fundamental studies of reactivity on single crystals to the design of catalysts[J]. Surface Science Reports, 1999,35(8):167-222. |
[11] | 张飞, 张明森. 甲醇制取低碳烯烃副产物分布规律研究[J]. 工业催化, 2009,17(4):209-211. |
[12] | 赵闯, 苏文利, 臧甲忠, 等. 两种AgX改性吸附剂的烷烃/烯烃的分离技术[J]. 无机盐工业, 2019,51(7):100-103. |
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