Chemicals | Multiparameter Characterization of Ionic Liquids for Quality Control and Process Optimization
Ionic liquids are increasingly used in the chemical, biopolymer, and battery industries, requiring reliable quality control. Density, sound velocity, viscosity, and refractive index were determined using a multiparameter measurement system, enabling efficient characterization and batch control.
Ionic liquids (ILs) are salts that remain liquid below 100 °C, in many cases already at room temperature. Unlike conventional salts such as sodium chloride, which form rigid crystalline solids, ionic liquids are composed of bulky, asymmetric ions that prevent efficient packaging, resulting in a fluid structure.
What makes them particularly special is their unique combination of properties: they have negligible vapor pressure, high thermal and chemical stability, and excellent ability to dissolve a wide range of organic, inorganic, and polymeric materials. These features make ionic liquids attractive as “green” alternatives to volatile organic solvents in many processes. Their tunability is another major advantage: by carefully selecting different cations and anions, ILs with specific properties, e.g. tunable polarity, can be designed.
As a result, they are used in diverse fields such as catalysis, electrochemistry (e.g. electrolytes for batteries or supercapacitors), dissolving and processing of biopolymers, e.g. cellulose or lignin, and separation processes, where their customizable nature allows for improved efficiency, and reduced environmental impact compared to traditional solvents.
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