monomer can't be obtained through the distillation process. The extraction and separation processes reported here using deionized water as a green solvent offer significant advantages in not only target oligomer collection but also unreacted FA monomer's efficient recovery. CONCLUSIONDeionized water as a green solvent could be used efficiently for the FA monomer extraction from acid catalyzed FA products, with a high extractability. Furthermore, unreacted FA monomer and trace amounts of oligomers can be also separated from aqueous solution using the salting-out method with magnesium sulfate. ( Figure S1) After two-step extraction and separation processes, ~84wt% FA monomer was recovered: (1) ~91wt% FA monomer extraction from FA monomer/oligomers and (2) ~92wt% FA monomer separation from the aqueous solutions. Even though small amount of oligomers were found in the salting-out FA, the reported methodology lead to improve the biomass derived platform chemical's, such as furfuryl alcohol (FA), purification and recovery from mixed products. ASSOCIATED CONTENTSupporting Information. One table (S1) lists the available liquid separation technologies with their advantages and disadvantages. One table (S2) lists the partition coefficient, Volume ratio V o /V a , and extractability during liquid-liquid extraction of FA. One schematic figure (S1) explain the separation and purification process. This material is available free of charge via the Internet at

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