摘要
对三氯化铝-氯代丁基甲基咪唑([Bmim]Cl-AlCl_3)、三氯化铝-氯代丁基吡啶(BPC-AlCl_3)、三氯化铝-四甲基氯化铵([Me_4N]Cl-AlCl_3)离子液体催化β-甲基萘(β-MN)歧化制备2,6-二甲基萘(2,6-DMN)进行了研究。通过正交实验,考察了3种不同阳离子型离子液体中反应温度、AlCl_3在离子液体中所占的摩尔分数及催化剂质量分数等反应条件对β-MN歧化反应的转化率和2,6-DMN选择性的影响,对比了3种阳离子型离子液体的催化反应性能。结果表明：[Bmim]Cl-AlCl_3酸性离子液体最适合催化β-MN歧化反应。在反应温度160℃、AlCl_3摩尔分数0．8、催化剂质量分数14%条件下,β-MN转化率可达42．9%,2,6-DMN的选择性达到40．6%。反应系统中微量水是使离子液体失活的主要原因。
Disproportionation of β-methylnaphthalene （β-MN） to 2,6-dimethylnaphthalene （2,6-DMN） over ionic liquid catalysts, such as 1,3-dialkylimidazolium aluminum chloride （[Bmim] AlCl4 ）, N-al- kylpyrodium aluminum chloride （BPC-AlCl3） and alkylammonium aluminum chloride （[ Me4N] AlCl4）, was studied. Effects of reaction conditions such as temperature, reaction time, acid intensity and ionic liquid amount on the conversation of β-MN and selectivity to 2,6-DMN with three cationic ionic liquid catalysts were investigated. The results showed that ionic liquid [Bmim] AlCl4 was the most suitable catalyst for the disproportion of β-MN. Under the following conditions. 160 ℃, 14% （w） catalyst, mole ratio of AlCl3 in [Bmim]AlCl4 = 0.8, the conversation of β-MN and the selectivity to 2,6-DMN reached 42.9% and 40.6%, respectively. Trace amount of water was found to be responsible for the deactivation of the ionic liquid catalysts.
出处
《精细石油化工》
CAS
CSCD
北大核心
2006年第2期18-21,共4页
Speciality Petrochemicals
关键词
Β-甲基萘
歧化反应
离子液体
2
6-二甲基萘
β-methylnaphthalene
disproportionation
ionic liquid
2,6-dimethylnaphthalene
