Nanofiltration for the Separation of Nonvolatile Products from Solutions Containing Ionic Liquids

Abstract

Nanofiltration (NF) can be used to isolate nonvolatile compounds from solutions containing ionic liquids (IL). This was shown for the mixtures bromophenol blue/IL and lactose/IL. In both cases the product was rejected while the ionic liquid permeated. Alternatively, the rejection of the ionic liquid is possible as well. Such separations are possible because nanofiltration membranes are selective towards size and charge of the components.

Composition and structural effects on the adsorption of ionic liquids onto activated carbon

“…[16][17][18] It is important to consider that in the framework of the development of sustainable processes, the ILs recycling aer regeneration or recovery must be envisaged. 8 Amongst the available non-destructive technologies, distillation, 19 crystallization, 20 nanoltration, 21 pervaporation, 22 separation treatment by using salts 23 and adsorption onto solids [24][25][26][27][28][29][30][31][32] are being increasingly studied. Adsorption onto activated carbons (ACs) has been recently demonstrated to be an effective and non-destructive technique for the removal of imidazolium-based ILs from aqueous solutions and their recovery for further use.…”

Direct conversion and NMR observation of cellulose to glucose and 5-hydroxymethylfurfural (HMF) catalyzed by the acidic ionic liquids

“…Furthermore, hydrolysis of cellulose to the sugars such as monosaccharides and disaccharides was observed when liquid acids or solid acids were added to the reaction system with ILs as solvents [4][5][6]. The separation of the products (from ILs) can be achieved by extraction, e.g., supercritical CO 2 , or the so-called nanofiltration by the membrane [7]. It is interesting to note that the product of resulting monosaccharides could be subsequently converted to other valuable products, e.g., 5-hydroxymethylfurfural (HMF), which could be used for the future liquid fuel [8].…”

Ionic Liquids in Carbohydrate Chemistry - Current Trends and Future Directions

“…Furthermore, new developments are to improve recovery processes involving RTILs. For example, Krockel and coworkers [48] have recently developed a filtration process based on nanotechnology to recover the non-volatile compounds, including carbohydrates, from ionic liquids.…”