2‐3 July 2015
IBEROAMERICAN MEETING ON IONIC LIQUIDS
Book of Abstracts
CENTRO CULTURAL LA CORRALA – MADRID (SPAIN)
www.uam.es/imil2015
P 113 Poster Presentation abstract for the Iberoamerican Meeting on Ionic Liquids- IMIL 2015 July 2-3, 2015 • Madrid • Spain
Advances in Imidazole-derived RTILs Synthesis Francisco-Javier Toledo*, Ana-Vanesa Quevedo, Elsa-María Rodríguez Universidad de Las Palmas de Gran Canaria, Spain, 35017 *
[email protected]
Room Temperature Ionic Liquids (RTILs) can be designed for every kind of application due to the fact that the selection of their ions will determine their physical and chemical properties. Certain interest has been aroused in our group in studying the synthesis of these ionic liquids using modern instrumental methods that enable us to optimise the quality of the product. Synthesising RTILs, such as 1-butyl-3-methylimidazolium bromide (BMIMBr), represents a highly exothermic alkylation and the kinetics (SN2) are too fast. The high temperature has a detrimental effect on the quality of the RTILs obtained. So it is crucial to eliminate the heat released by the reaction efficiently to enhance the purity of the product. One way of controlling the temperature in a highly exothermic reaction is to do it slower. The traditional solution was to dilute the reagents with solvents and/or slowly add one of the reagents in Batch reactors with heating/ cooling systems. Solvents that are ideal for the SN2 reaction are usually used, such as acetone or chloroform. The use of large volumes of solvents increases costs and also pollution, and slowly adding reagents sometimes leads to very slow reactions (hours or days) with a progressive loss of the alkylating reagent from evaporation. A solvent-free synthesis system with optimised thermic transfer was therefore advisable. This was made possible by synthesis in a continuous channel micro-reactor.[1,2] So, Iolitec Ionic Liquids Technologies (Io-li-tec) designed a modular continuous micro-reactor system for producing ionic liquids, specifically by reactions of amines (e.g. 1-methylimidazole) with alkylating agents like alkyl chlorides, bromides, iodides and sulphates. The system is a self-confined unit with peripherals that have to be attached in the form of power supply, substrate supply and product outlet. The system was designed to perform alkylating reactions in tube reactors (PFTE or stainless steel).
This study addresses different aspect concerning the synthesis of the following RTILs: HMIMCl, HMIMBr, BMIMCl, BMIMBr, DMIMMSO4 and EMISE, together with a study of the fine-tuning and validation of the aforesaid Io-Li-Tec modular apparatus by NMR and physical-chemical constant quality control of the product. References
[1] P. Löb et al., Ionic Liquid Synthesis in Continuous Micro-reactor Using a Multi-Scale Approach, Récents Progrés en Génie des Procédés. 94 (2007) 1–9. [2] H. Lowe et al, Flow chemistry: Imidazole-based ionic liquid syntheses in micro-scale, Chemical Engineering Journal. 163 (2010) 429-437.
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