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首页> 外文期刊>RSC Advances >Diamines as switchable-hydrophilicity solvents with improved phase behaviour
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Diamines as switchable-hydrophilicity solvents with improved phase behaviour

机译：二胺作为可切换的亲水性溶剂，具有改善的相行为

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摘要

Removing solvents by distillation is not a sustainable process because it requires the use of volatile solvents and a high energy input. An alternative is to use a switchable-hydrophilicity solvent (SHS), which can be removed from products and recycled without any distillation step. SHSs are solvents that reversibly switch between hydrophilic and hydrophobic forms with the addition and removal of a trigger such as CO _(2) . Monoamine SHSs can be separated from dissolved products by extraction into carbonated water, but the solvent removal is limited by the distribution coefficient of the SHS between the carbonated water phase and the product phase. In this article, the use of diamines as SHSs with improved distribution coefficients is explored. Several diamine SHSs are identified and their properties compared to those of monoamine SHSs. Comparisons include the p K _(aH) (the p K _(a) of the conjugate acid of a base) and log? K _(ow) (log of the octanol–water partition coefficient) requirements for amines to act as SHSs, distribution coefficients, removal from hydrophobic liquids, switching speeds, and risks to the environment and human health and safety.
机译：通过蒸馏除去溶剂不是可持续的过程，因为它需要使用挥发性溶剂和高能量输入。一种替代方法是使用可切换的亲水性溶剂（SHS），可以将其从产品中除去并无需任何蒸馏步骤即可循环使用。 SHS是溶剂，可通过添加和去除触发器（例如CO_（2））在亲水和疏水形式之间可逆地转换。单胺SHS可以通过萃取到碳酸水中从溶解的产品中分离出来，但是溶剂的去除受到SHS在碳酸水相和产物相之间的分配系数的限制。在本文中，探索了使用二胺作为具有改善的分配系数的SHS。鉴定出几种二胺SHS，并将其性质与单胺SHS进行比较。比较包括p K _（aH）（碱的共轭酸的p K _（a））和log？胺作为SHS的K _（ow）（辛醇-水分配系数的对数）的要求，分配系数，从疏水性液体中的去除，转换速度以及对环境和人类健康与安全的风险。

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