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Aroma recovery by integration of sweeping gas pervaporation and liquid absorption in membrane contactors

机译：通过在膜接触器中整合扫气和蒸发吸收液体来恢复香气

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摘要

An integrated process for recovering of aroma compounds from dilute natural matrices is proposed, combining the advantages of organophilic and sweeping gas pervaporation with gas-liquid absorption in membrane contactors. This process avoids the use of vacuum conditions and condensation steps for aroma recovery. Additionally, it presents the advantage of stabilising the target aroma compounds after being captured in a liquid absorbent, which is used as an additive in food and/or cosmetic products. After solubilisation in the selected absorbent the aromas may be delivered and released in the final product. In order to optimise this integrated process the conditions for sweeping gas pervaporation, namely the sweep gas linear velocity in the downstream circuit of the pervaporation module, were firstly optimised. Several potential food/cosmetic compatible additives were tested and their affinity towards the target aroma compounds was evaluated. High partitions of the aroma compounds to polyethylene glycol (PEG) 300 were observed, especially for hydrophobic esters, making possible to achieve an additional degree of selectivity. Finally, the absorption of aromas in a non-dispersive membrane contactor system was achieved under extremely stable operating conditions.
机译：提出了一种从稀的天然基质中回收香气化合物的综合方法，该方法结合了亲有机性和吹扫性气体全蒸发与膜接触器中气液吸收的优点。该过程避免了使用真空条件和冷凝步骤来回收香气。另外，它具有被捕获在液体吸收剂中之后稳定目标芳香化合物的优点，该液体吸收剂被用作食品和/或化妆品中的添加剂。在选定的吸收剂中溶解后，香气可以在最终产品中传递和释放。为了优化该集成过程，首先优化了吹扫气体全蒸发的条件，即在渗透蒸发模块下游回路中的吹扫气体线速度。测试了几种潜在的食品/化妆品相容性添加剂，并评估了它们对目标香气化合物的亲和力。观察到香气化合物在聚乙二醇（PEG）300中的分配较高，尤其是对于疏水性酯而言，从而有可能实现更高的选择性。最后，在非常稳定的操作条件下，在非分散膜接触器系统中吸收了香气。

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