Ionic liquids (ILs) have received substantial attention in basic and applied research in the last two decades. This work is focused on deeper understanding of carboxylic acids extraction by ILs with potential in recovery of platform chemicals from diluted streams in biorefineries. Results of an NMR study of structural changes of a system composed of trihexyl-(tetradecyl)-phosphonium decanoate, butyric acid (BA) and water are presented. ¹H, ¹³C and ³¹P NMR were used for the determination of system composition, its dynamic behavior and for the study of interactions between components of the system with different water and BA loadings. The hypothesis of water being extracted by IL in separate regions (polar domains) was postulated. Water extraction goes through a continuous series of intermediate structures until a relatively stable structure is achieved. Extraction of BA with water saturated IL proceeds via two different mechanisms: replacement of water molecules in polar domains by BA molecules in early stages of the extraction, and co-extraction of BA and water molecules at higher BA concentrations with the change of IL structure to a less rigid one. From dynamic study (selfdiffusion coefficients) it follows that components of IL systems do not form tight complexes, but water and BA molecules can move partly independently of IL ions.

在过去的二十年中，离子液体（ILs）在基础和应用研究中受到了广泛的关注。这项工作的重点是对IL提取羧酸的深入了解，具有从生物精炼厂稀释流中回收平台化学品的潜力。给出了由三己基-（十四烷基）-癸酸phosph，丁酸（BA）和水组成的系统的结构变化的NMR研究结果。¹ H，¹³ C和³¹P NMR用于确定系统组成，动力学行为以及研究不同水和BA负载下系统各组件之间的相互作用。假设水在独立区域（极性区域）被IL提取的假说。水提取经历一系列连续的中间结构，直到获得相对稳定的结构。用水饱和的IL提取BA的过程有两种不同的机制：在提取的早期用BA分子替换极性域中的水分子，以及随着IL结构的变化将BA和水分子在较高BA浓度下共提取。较不严格的。从动态研究（自扩散系数）可以得出，IL系统的组成不会形成紧密的复合物，