作者:Philip G. Jessop、Lam Phan、Andrew Carrier、Shona Robinson、Christoph J. Dürr、Jitendra R. Harjani
DOI:10.1039/b926885e
日期:——
A new kind of switchable solvent, a switchable-hydrophilicity solvent, is hydrophobic and has very low miscibility with water when in air but is hydrophilic and has complete miscibility with water when under an atmosphere of CO2. We report here the first example of such a solvent, N,N,N′-tributylpentanamidine. Solvents such as these could be used for the extraction of low-polarity organic products, such as vegetable oils, followed by the removal of the solvent from the product by carbonated water. Carbonated water is able to extract the solvent from the product because the CO2 converts the solvent to its hydrophilic form. The solvent can then be separated from the carbonated water upon removal of the CO2, because this removal triggers the conversion of the solvent back to its hydrophobic, water-immiscible form. Importantly, distillation is not required for removal of the solvent from the product.
一种新型可切换溶剂--可切换亲水性溶剂--在空气中是疏水性的,与水的混溶性很低,但在二氧化碳环境下是亲水性的,与水完全混溶。我们在此报告了这种溶剂的第一个例子,即 N,N,N′-三丁基戊脒。这类溶剂可用于萃取植物油等低极性有机产品,然后用碳酸水去除产品中的溶剂。碳酸水能够从产品中萃取出溶剂,因为二氧化碳会将溶剂转化为亲水形式。移除二氧化碳后,溶剂又可以从碳酸水中分离出来,因为移除二氧化碳后,溶剂又会转化为疏水性、不溶于水的形式。重要的是,从产品中去除溶剂不需要蒸馏。