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Issue 9, 2007
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Synthesis of [EMIM]OH via bipolar membrane electrodialysis – precursor production for the combinatorial synthesis of [EMIM]-based ionic liquids

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Abstract

A new environmentally benign process for the production of aqueous solutions of [EMIM]OH is reported. Electrodialysis with bipolar membranes (EDBM) was implemented for the first time to produce this hydroxide-based precursor in 5% concentration in water from the non-toxic bulk ionic liquid [EMIM][EtOSO3] at the kg-scale. The results are discussed with regard to ease of operation, productivity and obtained product quality. Moreover, several structurally new ionic liquids were synthesized by reaction of the aqueous precursor solution with different acids, such as, e.g., H2SiF6 or hexafluoroacetylacetone. But also the synthesis of well-established ionic liquids, such as, e.g., [EMIM][BF4] has been carried out using the hydroxide intermediate and the full procedure is compared to well-established ion metathesis protocols.

Graphical abstract: Synthesis of [EMIM]OH via bipolar membrane electrodialysis – precursor production for the combinatorial synthesis of [EMIM]-based ionic liquids

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Article information


Submitted
30 Nov 2006
Accepted
26 Jan 2007
First published
02 Mar 2007

Green Chem., 2007,9, 935-942
Article type
Paper

Synthesis of [EMIM]OH via bipolar membrane electrodialysis – precursor production for the combinatorial synthesis of [EMIM]-based ionic liquids

S. Himmler, A. König and P. Wasserscheid, Green Chem., 2007, 9, 935
DOI: 10.1039/B617498A

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