Ionic Liquids and Hyperbranched Polymers – Promising New Classes of Selective Entrainers for Extractive Distillation
نویسنده
چکیده
Ionic liquids (IL) and hyperbranched polymers (HyP) represent new classes of nonvolatile selective solvents. By measuring vapor-liquid equilibria (VLE) of azeotropic and close boiling systems in the presence of ionic liquids or hyperbranched polymers, separation factors are derived and the potential of using IL and HyP as entrainer for extractive distillation is discussed. Exemplarily, the superiority of IL to conventional entrainers such as 1,2-ethanediol is pointed out by simulating extractive distillation processes for the separation of the azeotropic ethanol–water system using ASPEN PLUS. The individual processes are energetically optimized and different unit operations for the regeneration of non-volatile entrainers are proposed. Both ionic liquids and hyperbranched polymers show remarkable selectivities, solubilities as well as low solution viscosities. They drastically increase the separation factor of many azeotropic and close boiling systems, which permits considerable improvements of processes such as extractive distillation.
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