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Mutual Solubilities of Ammonium-Based Ionic Liquids with Water and with Water/Methanol Mixture

机译:铵基离子液体与水和水/甲醇混合物的互溶性

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摘要

Over the last two decades, ionic liquids have gained importance as alternative solvents to conventional VOCs in the field of homogeneous catalysis. This success is not only due to their ability to dissolve a large amount of metal catalysts, but it is also due to their potential to enhance yields of enantiopure products. The art of preparation of a specific enantiomer is a highly desired one and searched for in pharmaceutical industry. This work presents a study on solubility in water and in water/methanol mixture of a set of ILs composed of the bis (trifluoromethylsulfonyl) imide anion and of the N-alkyl-triethyl-ammonium cation (abbrev. [NR,222][NTf2]) with the alkyl chain R ranging from 6 to 12 carbons. Mutual solubilities between ILs and water, as well as between ILs and methanol/water mixture were investigated in detail. These solubilities were measured using two well-known and accurate experimental techniques based on a volumetric and a cloud-point methods. Both methods enabled us to measure the Tx diagrams reflecting the mutual solubilities between water (or water/methanol) and selected ILs in the temperature range from 293.15 to 338.15 K. The data were fitted by using the modified Flory-Huggins equation proposed by de Sousa and Rebelo and compared also with the prediction carried out by the Cosmo-RS methodology
机译:在过去的二十年中,离子液体作为均相催化领域中传统VOC的替代溶剂已变得越来越重要。这种成功不仅是由于它们溶解大量金属催化剂的能力,而且还因为它们具有提高对映纯产品收率的潜力。特定对映体的制备技术是非常需要的,并且在制药工业中正在寻找。这项工作提出了一组由双(三氟甲基磺酰基)酰亚胺阴离子和N-烷基-三乙基-铵阳离子(简称[IL,222] [NTf2]组成的IL)在水和水/甲醇混合物中的溶解度的研究。 ]),烷基链R的碳数为6至12。详细研究了离子液体和水之间以及离子液体和甲醇/水混合物之间的互溶性。使用基于体积法和浊点法的两种众所周知且精确的实验技术来测量这些溶解度。两种方法都使我们能够测量在293.15至338.15 K温度范围内反映水(或水/甲醇)与所选IL的互溶性的Tx图。数据使用de Sousa提出的经过改进的Flory-Huggins方程进行拟合。和Rebelo并与Cosmo-RS方法进行的预测进行比较

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