METHOD FOR PURIFYING AN AQUEOUS-ALCOHOLIC FEEDSTOCK COMPRISING ETHANOL AND ACETALDEHYDE

The invention concerns a method for purifying an aqueous-alcoholic feedstock, comprising: a) a step of counter-current liquid-liquid extraction, comprising an extraction section supplied at the top with said aqueous-alcoholic feedstock and at least one intermediate raffinate fraction originating from step b) and at the bottom with an extraction solvent, and producing at the top an extraction stream and at the bottom a raffinate, the extraction section being operated at an average temperature in the extractor of between 10 and 40 DEG C; b) a counter-current liquid-liquid back-extraction comprising a back-extraction section supplied at the top with an acidic aqueous solution, having a pH between 0.5 and 5.0, and at the bottom with the extraction stream originating from step a), and producing at the top an extract and at the bottom the intermediate raffinate, the back-extraction section being operated at an average temperature between 40 and 80 DEG C. 本发明涉及纯化含水醇原料的方法，其包括：a)逆流液-液萃取步骤，其包括萃取段，所述萃取段在顶部进料有所述含水醇原料和来自步