engleski

Green approaches for ionic liquids synthesis: is microreactor technology the most promising one?

Ionic liquids’ synthesis via quaternization of imidazolium species is time and energy consuming process and is often carried out in organic solvents, which is not in accordance with the green aspects of ionic liquids. In order to reduce the preparation time and thereby energy costs, as well as harmful organic solvents consumption, more efficient and eco-friendly solvent-free methods have been the subject of a considerable recent attention. Herein we present a synthesis of 1-heptyl-2, 3- dimethylimidazolium bromide [C7mmim][Br] by various solvent-free methods: conventional water bath heating (WB), a microwave (MW)- and ultrasound (US)-assisted batch syntheses, as well as solvent-free synthesis within a continuous flow microreactor (MR). Results obtained were compared with respect to process kinetics, energy consumption and product quality in order to evaluate the most promising green processing approach.

ionic liquids ; microreactor ; microwave ; ultrasound ; quaternization

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