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New approach to regeneration of an ionic liquid containing solvent by molecular distillation

✍ Scribed by Marek Blahušiak; Štefan Schlosser; Ján Cvengroš; Ján Marták

Book ID
111491490
Publisher
Versita
Year
2011
Tongue
English
Weight
204 KB
Volume
65
Category
Article
ISSN
0366-6352

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✦ Synopsis

Abstract

A promising new process for the regeneration of solvents with ionic liquid by molecular distillation has been proposed. The main advantage of this process compared with the classic stripping of acids with alkali solution is that the volatile organic acid is recovered with a yield of about 88 % in the form of free acid, not as its salt. Furthermore, improvement on the yield of the stripping can be assumed. The consumption of chemicals in stripping by molecular distillation is reduced.

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## Abstract Brønsted acidic ionic liquid [PyNCH~2~CO~2~H][HSO~4~] was found to be an effective catalyst for the condensation reactions of indoles with various 4‐formylpyrazoles to afford the corresponding bis‐indolylmethanes containing pyrazole under solvent‐free conditions. The satisfactory result