Markus Hegelmann, Wilson F. Bohórquez, Johannes Luibl, Andreas Jess, Alvaro Orjuela and Mirza Cokoja
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引用次数: 0
摘要
植物油(VOs)是生产各种工业相关化合物(如环氧化产物(EVOs))的一种无害环境且可持续的碳原料。EVO 的商业化生产是一种异相液-液反应,反应速率低,环氧化物选择性有限。此外,从反应混合物中分离 EVO 的过程非常复杂,限制了大规模应用。在这项工作中,我们引入了表面活性咪唑鎓钨酸盐离子液体(SAILs)作为可持续催化剂,用于以过氧化氢为绿色氧化剂的 VOs 在水中的环氧化反应。在不同浓度和温度下,通过动态光散射(DLS)、透射电子显微镜(TEM)和低温透射电子显微镜(cryo-TEM)对 SAIL 催化剂中阳离子的性质进行了研究。回收研究表明,催化剂留在水相中,可以完全回收。电感耦合等离子体质谱法(ICP-MS)和 31P-NMR 光谱法验证了产品相中不存在催化剂和添加剂。
Biphasic phase-transfer catalysis: epoxidation of vegetable oils by surface active ionic liquids in water†
Vegetable oils (VOs) are an environmentally benign alternative and sustainable carbon feedstock for various industrially relevant compounds, e.g. epoxidized products (EVOs). The commercial production of EVOs is a heterogeneous liquid–liquid reaction with low reaction rates and a limited epoxide selectivity. Furthermore, the separation of the EVOs from the reaction mixture is very intricate, limiting large-scale applicability. In this work, we introduce surface-active imidazolium tungstate ionic liquids (SAILs) as sustainable catalysts for the epoxidation of VOs in water using hydrogen peroxide as a green oxidant. Micelle formation and substrate uptake into the aqueous phase depend on the nature of the cation of the SAIL catalyst, which was studied by dynamic light scattering (DLS), transmission electron microscopy (TEM) and cryo-TEM at various concentrations and temperatures. Recycling studies demonstrate that the catalyst remains in the aqueous phase and can be recovered completely. The absence of the catalyst and additive in the product phase is verified by inductively coupled plasma mass spectrometry (ICP-MS) and 31P-NMR spectroscopy.
期刊介绍:
Reaction Chemistry & Engineering is a new journal reporting cutting edge research into all aspects of making molecules for the benefit of fundamental research, applied processes and wider society.
From fundamental, molecular-level chemistry to large scale chemical production, Reaction Chemistry & Engineering brings together communities of chemists and chemical engineers working to ensure the crucial role of reaction chemistry in today’s world.