固体酸脱水剂表面酸性对一步法合成二甲醚的影响  

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

作　　者：许庆利[1] 李庭琛[1] 张素平[1] 任铮伟[1] 颜涌捷[1] 

机构地区：[1]华东理工大学生物质能源研究中心,上海200237

出　　处：《过程工程学报》2007年第5期905-909,共5页The Chinese Journal of Process Engineering

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γ-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.Hybrid catalysts composed of JC207 methanol synthesized catalyst and dehydrant （HZSM-5 zeolite or γ-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.

关 键 词：脱水剂 二甲醚 酸值 

分 类 号：TK6[动力工程及工程热物理—生物能]