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Isolation of carboxylic acids from dilute aqueous effluents can be achieved by the combination of liquid‐phase catalyzed reaction with liquid‐liquid extraction. Exemplarily the heterogeneously catalyzed esterification of acetic acid with methanol, accelerated with a cation‐exchange resin and simultaneous transfer of the product methyl acetate into the solvent ShellSol T, was successfully performed...
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