Synthesis of Brønsted dicationic basic ionic liquid and its catalytic activity for biodiesel production
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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Brønsted碱性双核离子液体.分别采用1H-NMR、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.Abstract: A new Brønsted 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 NMR spectra and elemental analysis and the thermal stability was analyzed by TGA. Meanwhile, 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.
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Key words:
- dication /
- basic ionic liquid /
- biodiesel /
- soybean oil /
- transesterification
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