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Kinetics and reactor design aspects of the synthesis of ionic liquids : Experimental and theoretical studies for ethylmethylimidazole ethylsulfate

Titelangaben

Große Böwing, Alexandra ; Jess, Andreas:
Kinetics and reactor design aspects of the synthesis of ionic liquids : Experimental and theoretical studies for ethylmethylimidazole ethylsulfate.
In: Chemical Engineering Science. Bd. 62 (2007) Heft 6 . - S. 1760-1769.
ISSN 0009-2509
DOI: https://doi.org/10.1016/j.ces.2006.03.038

Volltext

Link zum Volltext (externe URL): Volltext

Abstract

Ionic liquids (ILs) are promising new solvents, e.g. for catalysis and separation processes. Currently, ILs are produced in batch reactors at comparatively high prices. So improved and continuous reactors are probably provitable. Reaction engineering aspects of the exothermic IL-synthesis are exemplarily discussed for ethylmethylimidazole ethylsulfate ([EMIM][EtSO4]), formed by liquid phase alkylation of methylimidazole with diethylsulfate. Simulations based on the experimentally determined kinetic data show that an adiabatic loop reactor with an external heat exchange is the best choice, e.g. compared to expensive multi-tubular reactors, which are cooled intensively to avoid a runaway. The unfavourable dilution of the reactants in the loop reactor is outbalanced by the higher inlet temperature, which leads to a higher mean reaction rate (compared to multi-tubular reactors) and a much smaller reactor without exceeding the maximum temperature of 100 ∘ C (coloration of IL; long-term thermal stability). In addition, the design and operation of a loop reactor is straightforward and less complex. Compared to batch reactors, the hold-up is by a factor of 1000 lower, which is particularly advantageous for toxic reactants (here diethylsulfate). The results are beyond synthesis of [EMIM][EtSO4] instructive for other ILs, and probably also for other exothermic reactions with a temperature limit.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Ionic liquid; Loop reactor; Multi-tubular reactor; Liquid hold-up; Ethylmethylimidazole ethylsulfate
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Chemische Verfahrenstechnik
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Chemische Verfahrenstechnik > Lehrstuhl Chemische Verfahrenstechnik - Univ.-Prof. Dr.-Ing. Andreas Jess
Fakultäten
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 660 Chemische Verfahrenstechnik
Eingestellt am: 27 Apr 2015 06:49
Letzte Änderung: 27 Apr 2015 06:49
URI: https://eref.uni-bayreuth.de/id/eprint/11172