Biphasic water-based solvent systems offer the opportunity of efficient recycling of homogeneous catalysts. Water separates well from most organic solvents; therefore, water-soluble catalysts can be immobilized in this phase. Furthermore, water can substitute hazardous and environmentally unfriendly organic solvents in these systems. Within industry only the Ruhrchemie/Rhône-Poulenc process uses plain water to immobilize the homogeneous catalyst for the hydroformylation of propene. Yet for more hydrophobic substrates, no water-based system has been commercialized. This review will summarize recent developments in the field of water-based recycling strategies. Topics in this field are the intensification of the mixing process, the use of thermomorphic solvent systems, and the employment of several additives, like alcohols and surfactants. Continuously operated processes for these recycling strategies will be presented and discussed.

中文翻译：

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迈向水基回收技术：在液/液多相介质中均相催化剂回收的方法及其在连续过程中的实现

双相水基溶剂系统提供了有效回收均相催化剂的机会。水可以与大多数有机溶剂很好地分离。因此，水溶性催化剂可以固定在该阶段。此外，在这些系统中，水可以替代有害且对环境不利的有机溶剂。在工业中，只有Ruhrchemie /Rhône-Poulenc工艺使用纯水来固定均相催化剂以进行丙烯的加氢甲酰化。然而，对于疏水性更高的底物，尚未将水基系统商业化。这篇综述将总结水基回收策略领域的最新发展。该领域的主题是强化混合过程，使用热定型溶剂体系以及使用多种添加剂（如醇和表面活性剂）。