化工进展

• 化工过程与装备 • 上一篇    下一篇

吸附法分离焦化甲苯中的吡啶类物质及吸附剂的再生

牛丛丛1，陈莉君1，曾爱武2   

  1. 1天津大学化工学院，天津 300072；2天津大学化学工程联合国家重点实验室，天津 300072
  • 出版日期:2012-07-05 发布日期:2012-07-25

Separation of pyridines compounds from coking toluene and regeneration of adsorbents

NIU Congcong1, CHEN Lijun1, ZENG Aiwu2   

  1. 1 School of Chemical Engineering and Technology，2 State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, China
  • Online:2012-07-05 Published:2012-07-25

摘要： 采用气相吸附法以NaY分子筛作为吸附剂，对焦化甲苯进行精制脱氮，当吸附温度为115 ℃时，可以将焦化甲苯原料中吡啶和甲基吡啶的含量从5595 μg/g和1633 μg/g 均降到500 μg/g以下，NaY原粉和成型吸附剂的穿透处理量分别为12.44 g/g和5.94 g/g，对应的吸附量分别为0.90 mmol/g和0.44 mmol/g。热重分析（TGA）和核磁C谱（13C-NMR）的结果表明，采用250 ℃水蒸气再生的方法可以将吡啶和甲基吡啶脱附，但无法将积炭完全脱除。通过对比分子筛原粉和成型后吸附剂的吸附性能和再生性能，发现成型后的分子筛穿透处理量有所降低，但黏合剂的加入使其吸附性能更加稳定。并且在相同的吸附条件下，成型吸附剂比原粉吸附剂具有更强的深度脱氮能力。

关键词: 吡啶类, 焦化甲苯, 吸附, 水蒸气再生

Abstract: Denitrogenation of coking toluene was studied via gas phase-adsorption and NaY zeolite was used as adsorbent. The contents of pyridine and methylpyridine in coking toluene could be reduced from 5595 μg/g and 1633 μg/g to below 500 μg/g, when temperature of adsorption was 115 ℃. The breakthrough treatment capacities for raw powder adsorbent and shaped adsorbent were 12.44 g/g and 5.94 g/g respectively corresponding to the adsorption amounts of 0.90 mmol/g and 0.44 mmol/g. The results of TGA and 13C-NMR indicated that pyridines compounds could desorbed with steam at 250 ℃, but carbon deposit could not be totally desorbed. The adsorption and desorption behavior comparison of raw powder adsorbent and shaped adsorbent showed that shaped adsorbent had lower treatment capacity but higher deep denitrogenation ability than raw powder adsorbent.

Key words: pyridines compounds, coking toluene, adsorption, steam regeneration

版权所有 © 2019 《化工学报》编辑部
北京市东城区青年湖南街13号（100011）
电话：010-64519489，010-64519362，010-64519485，010-64519490，010-64519451
E-Mail：hgxb@cip.com.cn
京ICP备12046843号-7
京公网安备 11010102001995号
本系统由北京玛格泰克科技发展有限公司设计开发