Abstract
A concept for isolation of dilute low molecular weight carboxylic acids, based on surfactant-catalyst enhanced esterification, is proposed.
Highlights
Sustainable utilization of biobased feedstock to its full extent embodies one of the main aims of the biorefinery concept
Acetic acid (CAS: 64-19-7; Sigma-Aldrich) with a purity of 99– 100% and 1-octanol (CAS: 111-87-5; Sigma-Aldrich) with a purity of >98% were used as reactants. n-Undecane (CAS: 112021-4; Sigma-Aldrich) with a purity of >99% was used as diluent and 4-dodecylbenzenesulfonic acid (4DBSA; catalyst. Formic acid (CAS): 121-65-3; Sigma-Aldrich; mixture of isomers) with a purity of >95% was used as catalyst
Comparing different types of catalysts confirmed the necessity of emulsification for high process performance
Summary
Sustainable utilization of biobased feedstock to its full extent embodies one of the main aims of the biorefinery concept. This aim requires efficient and environmentally sound separation technologies.[1] Such processes are widely available for feed streams with highly concentrated constituents, in sharp contrast to the isolation of constituents from dilute aqueous streams/effluents. Dilute effluent streams occur throughout the biorefinery, exemplarily in pulping processes These processes generate effluents containing valuable constituents such as (hydroxy-)carboxylic acids at varying concentrations, which are either flushed or incinerated.[2,3]. A compilation of separation technologies for isolation of carboxylic acids from dilute aqueous streams is given by Talnikar et al.,[4] including reactive separations.
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