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Organoboron Ionic Liquids as Extractants for Distillation Process of Binary Ethanol + Water Mixtures
Processes ( IF 3.5 ) Pub Date : 2020-05-24 , DOI: 10.3390/pr8050628
Ilsiya M. Davletbaeva , Alexander V. Klinov , Alina R. Khairullina , Alexander V. Malygin , Sergey E. Dulmaev , Alisa R. Davletbaeva , Timur A. Mukhametzyanov

Aminoethers of boric acid, which are organoboron ionic liquids, were synthesized by using boric acid, triethanolamine, and triethylene glycol/diethylene glycol. Due to the formation of intermolecular complexes of borates, the structure of aminoethers of boric acid contains ion pairs separated in space, giving these compounds the properties inherent to ionic liquids. It is established that the thermal stability of aminoethers under normal atmospheric conditions increases with an increase in the size of the glycol. According to measurements of fast scanning calorimetry, density, dynamic viscosity, and electrical conductivity, water is involved in the structural organization of aminoethers of boric acid. The impact of the most thermostable organoboron ionic liquids on the phase equilibrium conditions of the vapor–liquid azeotropic ethanol–water mixture is studied. It is shown that the presence of these substances leads to increase in the relative volatility of ethanol. In general, the magnitude of this effect is at the level shown by imidazole ionic liquids, which provide high selectivity in the separation of aqueous alcohol solutions. A large separation factor, high resistance to thermal oxidative degradation processes, accompanied by low cost start reagents, make aminoethers of boric acid on the basis of triethylene glycol a potentially effective extractant for the extractive distillation of water–alcohol mixtures.

中文翻译:

有机硼离子液体作为二元乙醇+水混合物蒸馏工艺的萃取剂

硼酸的氨基醚是有机硼离子液体,是通过使用硼酸,三乙醇胺和三甘醇/二甘醇合成的。由于形成了硼酸盐的分子间复合物,硼酸的氨基醚的结构包含在空间上分开的离子对,使这些化合物具有离子液体固有的特性。已经确定,在正常大气条件下,氨基醚的热稳定性随着二醇尺寸的增加而增加。根据快速扫描量热法,密度,动态粘度和电导率的测量,水参与了硼酸氨基醚的结构组织。研究了最热稳定的有机硼离子液体对汽-液共沸乙醇-水混合物的相平衡条件的影响。结果表明,这些物质的存在导致乙醇的相对挥发度增加。通常,这种作用的程度处于咪唑离子液体所显示的水平,该咪唑离子液体在醇水溶液的分离中提供了高选择性。较大的分离系数,对热氧化降解过程的高抵抗力以及低成本的起始试剂,使得基于三甘醇的硼酸氨基醚成为水-醇混合物萃取蒸馏的潜在有效萃取剂。该作用的程度处于咪唑离子液体所显示的水平,该液体在醇水溶液的分离中具有很高的选择性。较大的分离系数,对热氧化降解过程的高抵抗力以及低成本的起始试剂,使得基于三甘醇的硼酸氨基醚成为水-醇混合物萃取蒸馏的潜在有效萃取剂。该作用的程度处于咪唑离子液体所显示的水平,该液体在醇水溶液的分离中具有很高的选择性。较大的分离系数,对热氧化降解过程的高抵抗力以及低成本的起始试剂,使得基于三甘醇的硼酸氨基醚成为水-醇混合物萃取蒸馏的潜在有效萃取剂。
更新日期:2020-05-24
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