Synthesis of methyl salicylate over mesoporous aluminosilicate materials
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摘要: 与传统合成水杨酸甲酯的工艺不同，采用碳酸二甲酯（DMC）作为酯化试剂与水杨酸反应制备了水杨酸甲酯。反应所使用的催化剂是一系列不同硅铝比的介孔硅铝化合物。结果表明，碳酸二甲酯是一种很好的酯化试剂，所合成的介孔硅铝化合物对此酯化反应是高效的催化剂。SA转化率可以达到98.6%，MS选择性可以达到77.0%，并且还发现水杨酸的转化率和水杨酸甲酯的选择性与催化剂上的Lewis酸位有很大联系。另外还讨论了此反应的机理。Abstract: Different from the traditional synthesis of methyl salicylate, the synthesis of methyl salicylate (MS) from salicylic acid (SA) and dimethyl carbonate (DMC) was carried out. The catalysts were a series of mesoporous aluminosilicate with different Si/Al mol ratio. The results showed that DMC was a good esterifying agent and mesoporous aluminosilicate was an effective catalyst for this esterification reaction. SA conversion and MS selectivity could reach 98.6% and 77.0% under suitable reaction condition. It was also found that both SA conversion and MS selectivity were closely related with Lewis acidity of the catalysts. In addition, the synergistic mechanism was proposed for the esterification of SA with DMC over mesoporous aluminosilicate.
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Key words:
- dimethyl carbonate /
- salicylic acid /
- methyl salicylate /
- mesoporous aluminosilicate
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