Continuous, Ionic Liquid‐Catalysed Propylation of Toluene in a Liquid‐Liquid Biphasic Reaction Mode using a Loop Reactor Concept

Abstract

Acidic ionic liquids of the type [cation] [bis (trifluoromethanesulfonyl)2 N]/AlCl 3 } have been applied to realise for the first time a continuous Friedel-Crafts alkylation reaction in liquid-liquid biphasic reaction mode using a loop reactor concept. Exemplified for the continuous propylation of toluene we have proved that the acidic catalyst layer is successfully immobilised over at least 18 h in the loop reactor. After 8 h time-on-stream, a steady state has been reached followed by at least 10 h time-onstream without any loss of activity or change in selectivity. Our results reveal the high potential of this class of acidic ionic liquids in continuous arene functionalisation reactions.

Coating of Pd/C catalysts with Lewis-acidic ionic liquids and liquid coordination complexes – SCILL induced activity enhancement in arene hydrogenation

“…Here, the leaching stopped aer a few hours once the most labile Al-species leached from the ionic liquid. 18 Whether a similar stabilization process occurs in the Pd-SCILL system under hydrogenation conditions is in the focus of ongoing studies. Different approaches can be envisioned to improve the retention of the Al-species including e.g.…”

Durability enhanced ionic liquid catalyst for Friedel–Crafts reaction between benzene and 1-dodecene: insight into catalyst deactivation

“…Not considering the case of biphasic behaviors, while direct application of this ionic liquid as catalyst will result in inaccurate measurement of the catalyst and a waste of the ionic liquid. 32 It is necessary to obtain deeper understanding of compound structures and Lewis acidity changing in biphasic behavior.…”

Tunable Aryl Imidazolium Recyclable Ionic Liquid with Dual Brønsted–Lewis Acid as Green Catalyst for Friedel–Crafts Acylation and Thioesterification

“…Most of the interest in ionic liquids concentrates on their ability to change considerably the reactivity of dissolved solutes. The properties of ionic liquids have caused them to be identified as designer solvents, including task specific ionic liquids [11,12]. A comprehensive understanding of the physical characteristics of ionic liquids can increase their industrial use [13].…”