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新型酸性离子液体[Hmim]HSO4催化合成油酸甲酯 |
Synthesis of oleic acid methyl oleate catalyzed by acidic ionic liquid [Hmim]HSO4 |
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DOI: |
中文关键词: 酸性离子液体 催化 酯化反应 油酸甲酯 |
英文关键词:acidic ionic liquid catalysis esterification reaction oleic acid methyl oleate |
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中文摘要: |
以N-甲基咪唑和浓硫酸为原料,制备了一种新型Brφnsted酸性离子液体[Hmim]HSO4,并将其应用到油酸甲酯的合成中。采用红外光谱法分析[Hmim]HSO4的化学结构,然后采用气质联用法对所得油酸甲酯进行定性分析。结果表明,酸性离子液体[Hmim]HSO4催化合成油酸甲酯的优化条件为:酸醇摩尔比1∶4(0.04 mol油酸)、离子液体用量3.5 mL、反应时间6 h,在此条件下,油酸酯化率为92.5%。酸性离子液体[Hmim]HSO4具有较好的催化活性,重复使用9次后,油酸酯化率仍在85%以上,且易与产品分离,克服了传统无机酸催化的缺陷。 |
英文摘要: |
Using N-methylimidazole and concentrated sulfuric acid as raw materials, a noval Brφnsted acidic ionic liquid [Hmim]HSO4 was synthesized and used as catalyst in the esterification reaction of oleic acid and methanol. The chemical structure of [Hmim]HSO4 was characterized by FTIR and the oleic acid methyl oleate was qualitatively analyzed by GC-MS. The results showed that the optimal synthesis conditions of oleic acid methyl oleate catalyzed by ionic liquid [Hmim]HSO4 were obtained as follows: molar ratio of oleic acid to methanol 1∶4 (0.04 mol oleic acid), catalyst dosage 3.5 mL and reaction time 6 h. Under these conditions, the esterification rate of oleic acid reached 92.5%. The esterification rate of oleic acid was still above 85% when ionic liquid [Hmim]HSO4 had been reused for nine times. Therefore, the ionic liquid [Hmim]HSO4showed good catalytic activity and was easily separated from product, which overcame the shortcomings of traditional inorganic acid catalysis. |
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