| 摘要 |
Recovering and isolating carboxylic acids from waste solutions in pulp production, comprises adding an extraction agent (I) to the waste solution. The waste solution comprises a mixture of carboxylic acid, lignin, water and carboxylic acid esters, furfural and dissolved sugars. (I) is ether, optionally saturated carbohydrates, alcohols, alkylester, arylester, alkylamine, arylamine, cyclic alkylketones, unsaturated alkylketones, methylisobutylketone, methylbutylketone, methylpropylketone, alkyl monocarboxylic acids, aromatics and aldehydes.
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