硝酸改性丝光沸石上合成2,6-二异丙基萘  

Synthesis of 2,6-Diisopropylnaphthalene over H-mordenite Catalyst Modified by Nitric Acid

作　　者：何广湘[1,2] 巩雁军[1] 刘艳红[1,2] 靳海波[2] 窦涛[1] 

机构地区：[1]中国石油大学(北京)中国石油天然气集团公司催化重点试验室,北京102249 [2]北京石油化工学院化工系,北京102617

出　　处：《化学工业与工程》2010年第1期1-6,共6页Chemical Industry and Engineering

基　　金：中国石油化工股份有限公司课题项目(200424);北京市属高等学校人才强教深度计划资助项目(PHR200906139)

摘　　要：采用HNO3对丝光沸石(HM)进行脱铝改性,并采用固定床反应器对其萘异丙基化反应的性能进行评价,考察了不同脱铝方式和不同Si/Al原子比对改性HM萘异丙基化性能的影响。结果表明,水蒸汽和硝酸处理的催化剂,其B酸与L酸的比例和酸强度分布可发生变化,在保持较好的萘转化率的前提下,提高了2,6-二异丙基萘(2,6-DIPN)的选择性。随着HNO3改性后HM分子筛的Si/Al原子比的增加,催化剂活性逐渐降低,稳定性提高,选择性先提高后降低。适宜的硝酸改性脱铝工艺条件为:HM沸石先经500℃、0.5h-1的空速下高温水蒸汽处理1.0h,再用1.6mol/L的HNO3溶液于45℃下处理24.0h,此时Si/Al原子比为31,2,6-DIPN的产率为7.24%。The H-mordenites （HM） was dealuminated by nitric acid leaching. The naphthalene isopropylation reaction performance of the modified HM zeolite catalyst was investigated in a fix-bed reaetor. Influences of different dealuminatation methods and Si/Al ratios on eatalytie performances were analyzed. The results show that the catalytic selectivity of 2, 6-DIPN is increased after dealuminated by nitric acid leaching. A combination of hydrothermal treatment with nitric acid leaching can remove acid centre effectively, change ratio of B to L acid and acid strength distribution. The seleetivity of 2, 6-DIPN is increased without decreasing naphthalene conversion rate. The increase of Si/Al ratio results in a slight decrease of catalytic activity and improvement of stability, the selectivity increased firstly and then decreased with increasing of Si/Al ratio. The optimized operating conditions for zeolite dealuminatation are as follows ： HM zeolites is treated in 0.5 h^-1 steam at 500 ℃ for 1.0 h, then is processed by nitric acid leaching at 45 ℃ for 24. 0 h. The corresponding Si/Al ratio is 31 and 2, 6-DIPN yield is 7.24%.

关 键 词：萘 异丙基化 2 6-二异丙基萘 丝光沸石 

分 类 号：TQ241[化学工程—有机化工]