Kinetics of Epoxidation of Cyclooctene with Ionic Liquids Containing Tungstate as Micellar Catalyst. Issue 12 (5th November 2021)

• Record Type: Journal Article
• Authors: Zehner, Bastian; Korth, Wolfgang; Schmidt, Fabian; Cokoja, Mirza; Jess, Andreas
• Is Part Of: Chemical engineering & technology. Volume 44:Issue 12(2021)
• Page Start: 2374
• Page End: 2381
• Publication Date: 2021-11-05
• Subjects: Cyclooctene -- Epoxidation -- Ionic liquids -- Kinetics -- Micellar catalysis; Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.202100102
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: The kinetics of cyclooctene epoxidation with H2 O2 by micellar catalysis was studied. As catalyst, an ionic liquid (IL) containing the catalytically active tungstate anion was used. The tungstate IL forms micelles in the aqueous H2 O2 phase. It is simply formed by dissolving sodium tungstate and 1‐octyl‐3‐methylimidazolium tetrafluoroborate [OMIM][BF4 ] in aqueous H2 O2 . For the epoxidation of cyclooctene by micellar catalysis, a power law kinetic model was determined that takes the critical micelle concentration into account. The kinetics of the [OMIM][BF4 ]/Na2 WO4 catalyst is similar to pure [OMIM]2 [WO4 ], which indicates that the active species is formed in situ. Addition of phenylphosphonic acid improves the activity of the tungstate IL. The most effective catalyst was tested in a semi‐continuous and continuous loop reactor. Abstract : The epoxidation of cyclooctene by micellar catalysis is described. The kinetics of the reaction using a tungstate‐based ionic liquid was determined from batch experiments. In the rate equation, the solubility of the reactant and the critical micelle concentration have been considered. The obtained results were employed to develop a model for a continuous loop reactor.