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›› 2007, Vol. 7 ›› Issue (5): 905-909.

• 反应与分离 • 上一篇    下一篇

固体酸脱水剂表面酸性对一步法合成二甲醚的影响

许庆利,李庭琛,张素平,任铮伟,颜涌捷   

  1. 华东理工大学能源化工系
  • 出版日期:2007-10-20 发布日期:2007-10-20

Effect of Solid Acid as Dehydrant on One-step DME Synthesis

XU Qing-li,LI Ting-chen,ZHANG Su-ping,REN Zhen-wei,YAN Yong-jie   

  1. Dept. Chem. Technol. Energy Resources, East China Univ. Sci. & Technol.,
  • Online:2007-10-20 Published:2007-10-20

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被引次数

30

摘要： 采用甲醇合成催化剂JC207和固体酸脱水剂(HZSM-5分子筛或g-Al2O3)混合制得合成二甲醚双功能催化剂，并在固定床反应装置中进行了活性评价，考察了固体酸脱水剂的酸性对一步法合成二甲醚的影响. 结果表明，脱水在B酸、L酸中心都可以进行，并且可能存在协同作用. 在实验范围内，L酸/B酸酸值比为3.270脱水效果最好. 固体酸脱水剂的脱水效果还与总酸值有关，在实验范围内，总酸值等于0.521时，脱水效果最好

关键词: 脱水剂, 二甲醚, 酸值

Abstract: Hybrid catalysts composed of JC207 methanol synthesized catalyst and dehydrant (HZSM-5 zeolite or g-Al2O3) were prepared for the synthesis of dimethyl ether (DME). Evaluation of catalytic activity on them was conducted in a fixed-bed reactor in order to investigate the effect of solid acid as dehydrant on one-step DME synthesis. The results show that dehydration occurs at B acid site or L acid site, and synergic function exits possibly between the two types of acids. In the experimental scope, when the ratio of L acidity to B acidity is equal to 3.270, the dehydration effect is the best. Besides the total amount of acidity plays a role in the dehydrated step, in the experimental scope, when the total amount of acidity is equal to 0.521, the dehydration effect is the best.

Key words: dehydrant, dimethyl ether, acidity