Br?nsted双核碱性离子液体的合成及其在制备生物柴油过程中的催化性能  

Synthesis of Br?nsted dicationic basic ionic liquid and its catalytic activity for biodiesel production

作　　者：王璐璐[1] 王吉林[1] 封瑞江[1] 张扬[1] 张帆[1] 

机构地区：[1]辽宁石油化工大学化学化工与环境学部石油化工学院,辽宁抚顺113001

出　　处：《燃料化学学报》2015年第1期59-64,共6页Journal of Fuel Chemistry and Technology

基　　金：辽宁省科技厅博士启动项目(20141126);辽宁省教育厅科学研究一般项目(L2013153);辽宁石油化工大学博士启动基金(2013XJJ-006)

摘　　要：以N-甲基吗啡啉和1,4-二溴丁烷为原料,通过两步法合成了新型Br?nsted碱性双核离子液体。分别采用1H-NM R、FT-IR和元素分析对合成的离子液体进行结构分析;采用TGA测试离子液体的热稳定性;同时测定了离子液体的溶解性和碱性。此外,考察了双核碱性离子液体在大豆油和甲醇酯交换反应中的催化活性。结果表明,当甲醇∶大豆油=14∶1(物质的量比)、离子液体用量为大豆油质量的5%、反应时间5 h、反应温度60℃时、生物柴油收率为95.6%(质量分数),且离子液体经回收、真空干燥,重复使用6次后催化活性没有明显降低,仍能达到94%以上。A new Brφnsted basic dicationic morpholine ionic liquid（IL） was synthesized with N-methyl morpholine and 1,4-dibromobutane via a two-step procedure. The structure of new dicationic IL was characterized by FT-IR,1H NM R spectra and elemental analysis and the thermal stability was analyzed by TGA.M eanw hile,the alkalinity and solubility of the dicationic IL were measured and its catalytic activity in the transesterification of soybean with methanol to produce biodiesel was investigated. The results show that under the optimized conditions of n（methanol）/n（soybean oil） = 14,catalyst amount of 5% based on soybean oil,60 ℃ and 5 h,the yield of biodiesel reaches 95. 6%. After recycled by drying under vacuum,the dicationic IL can be reused for more than 6 times without significant decrease in the catalytic activity.

关 键 词：双核阳离子 碱性离子液体 生物柴油 大豆油 酯交换 

分 类 号：TQ517.4[化学工程]