CAJ | 학술논문

维生素E合成过程中催化剂用量大、损失严重且不能循环使用，后处理过程产生大量废液导致严重的环境问题。实验合成了几种Lewis酸性离子液体，并应用于维生素E合成。研究发现，[(C2H5)3NH]Cl/ZnCl2离子液体催化合成维生素E效果最好，该离子液体中无机阴离子起主要催化作用，季铵阳离子易与异植物醇的羟基形成氢键，能使异植物醇与主环发生定向缩合反应。采用FT-IR研究了[(C2H5)3NH]Cl/ZnCl2离子液体结构和酸性，并系统考察了其对维生素E合成的影响。随着ZnCl2摩尔分数增加，离子液体的Lewis酸性增强。在ZnCl2摩尔分数为0.66的[(C2H5)3NH]Cl/ZnCl2离子液体催化作用下，维生素E的产率可达到87.4%，该离子液体重复使用5次，催化性能没有明显下降。
유생소E합성과정중최화제용량대、손실엄중차불능순배사용，후처리과정산생대량폐액도치엄중적배경문제。실험합성료궤충Lewis산성리자액체，병응용우유생소E합성。연구발현，[(C2H5)3NH]Cl/ZnCl2리자액체최화합성유생소E효과최호，해리자액체중무궤음리자기주요최화작용，계안양리자역여이식물순적간기형성경건，능사이식물순여주배발생정향축합반응。채용FT-IR연구료[(C2H5)3NH]Cl/ZnCl2리자액체결구화산성，병계통고찰료기대유생소E합성적영향。수착ZnCl2마이분수증가，리자액체적Lewis산성증강。재ZnCl2마이분수위0.66적[(C2H5)3NH]Cl/ZnCl2리자액체최화작용하，유생소E적산솔가체도87.4%，해리자액체중복사용5차，최화성능몰유명현하강。
The main problems in the synthesis of vitamin E are large dosage and much loss of the catalyst, as well as difficulty to recycle the catalyst. There also exist serious environmental problems caused by contamination of water with the catalysts in the washing process. Several ionic liquids were synthesized to catalyze the synthesis of vitamin E. [(C2H5)3NH]Cl/ZnCl2 ionic liquid had the best catalytic performance. The inorganic anion in the ionic liquid played the major catalytic role, and the quaternary ammonium cation could form hydrogen bonds with isophytol easily, which enabled directed condensation reaction between isophytol and trimethylhydroquinone. The structure and acidity of [(C2H5)3NH]Cl/ZnCl2 ionic liquid were characterized by FT-IR, and its effect on production of vitamin E was investigated. With the increase of mole fraction of ZnCl2, the ionic liquid showed stronger acidity. When the mole fraction of ZnCl2 in ionic liquid was 0.66, yield of vitamin E could reach 87.4%under catalysis of [(C2H5)3NH]Cl/ZnCl2. The ionic liquid could be reused 5 times without significant decrease in catalytic performance.