Intensification of esterification through emulsification: isolation of dilute low molecular weight carboxylic acids

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A concept for isolation of low molecular weight carboxylic acids (e.g., acetic acid) from dilute aqueous streams was developed. This concept of combining chemical conversion of the carboxylic acids with in situ liquid–liquid extraction enhanced by catalysis and emulsification was proven applicable for carboxylic acid concentration of 1 mol l−1. Chemical conversion was achieved by esterification with 1-octanol, catalysed by the surfactant 4-dodecylbenzenesulfonic acid. Emulsification induced by the catalyst was confirmed to be essential for high conversion and separation efficiency. Investigations were supported and evaluated by design of experiments and yielded conversions beyond 54.3% and separation efficiencies beyond 57.5% for acetic acid. Evaluation of process parameters yielded a quadratic model for prediction of process performance. Applicability of the concept for formic acid, propionic acid and butyric acid isolation from aqueous feed was confirmed.
Original languageEnglish
Pages (from-to)905-911
JournalReaction Chemistry & Engineering
Volume3
DOIs
Publication statusPublished - 8 Oct 2018

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Emulsification
Esterification
Carboxylic Acids
Carboxylic acids
formic acid
Molecular weight
Acetic acid
Acetic Acid
1-Octanol
Propionic acid
Butyric acid
Butyric Acid
Formic acid
Surface-Active Agents
Design of experiments
Catalysis
Surface active agents
Catalysts
Acids

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Intensification of esterification through emulsification: isolation of dilute low molecular weight carboxylic acids. / Toth, Andreas; Lux, Susanne; Painer, Daniela; Siebenhofer, Matthäus.

In: Reaction Chemistry & Engineering, Vol. 3, 08.10.2018, p. 905-911.

Research output: Contribution to journalArticleResearchpeer-review

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abstract = "A concept for isolation of low molecular weight carboxylic acids (e.g., acetic acid) from dilute aqueous streams was developed. This concept of combining chemical conversion of the carboxylic acids with in situ liquid–liquid extraction enhanced by catalysis and emulsification was proven applicable for carboxylic acid concentration of 1 mol l−1. Chemical conversion was achieved by esterification with 1-octanol, catalysed by the surfactant 4-dodecylbenzenesulfonic acid. Emulsification induced by the catalyst was confirmed to be essential for high conversion and separation efficiency. Investigations were supported and evaluated by design of experiments and yielded conversions beyond 54.3{\%} and separation efficiencies beyond 57.5{\%} for acetic acid. Evaluation of process parameters yielded a quadratic model for prediction of process performance. Applicability of the concept for formic acid, propionic acid and butyric acid isolation from aqueous feed was confirmed.",
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