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

Title data

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. Vol. 62 (2007) Issue 6 . - pp. 1760-1769.
ISSN 0009-2509
DOI: https://doi.org/10.1016/j.ces.2006.03.038

Official URL: Volltext

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Ionic liquid; Loop reactor; Multi-tubular reactor; Liquid hold-up; Ethylmethylimidazole ethylsulfate
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Chemical Engineering
Faculties > Faculty of Engineering Science > Chair Chemical Engineering > Chair Chemical Engineering - Univ.-Prof. Dr.-Ing. Andreas Jess
Faculties
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 620 Engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Date Deposited: 27 Apr 2015 06:49
Last Modified: 27 Apr 2015 06:49
URI: https://eref.uni-bayreuth.de/id/eprint/11172