Produced water treatment has become a challenge for the oil industry to meet environmental legislation requirements, due to several dissolved organic compounds, which are barely removed under conventional treatments. In this work, oil and grease removal from real offshore produced water samples was evaluated by a novel liquid-liquid extraction process, followed by efficient phase separation in a mixer-settler based on phase inversion. In this novel approach, a condensate–average stream composition collected from offshore oil production platforms was used as an extraction solvent to remove mainly dissolved compounds. This strategy treatment, which is considered unprecedented in the industry, may allow oil producers to overcome many logistic challenges, also reducing inputs consumption and costs. The synthetic condensate potential was also compared to n-hexane and n-heptane in batch tests. According to the results, solvent concentration and pH exerted a significant influence on the extraction efficiency. Only at pH 4 and 1:10 solvent ratio, excellent removal efficiencies were obtained. Another significant result observed in the study was the mixer-settler performance, which allowed instantaneous phase separation with high extraction efficiency. At 10% (v/v) of condensate, the flow rate of 10 L/h and at pH 4, the applied process was able to reach the PW requirements for discharge according to the Brazilian National Environment Council guidelines in a single extraction step, resulting in a final outlet stream containing oil and grease under 29 mg/L, measured according Standard Method 5520 – B (Partition Gravimetric Method). This work offers an alternative to overcome the main produced water management challenges faced by the oil industry, using more efficient and compact equipment and reduced operating costs since the inputs are available on the offshore oil production platforms.

由于几种溶解的有机化合物在常规处理中几乎不能去除，因此采出水处理已成为石油工业满足环境法规要求的挑战。在这项工作中，通过一种新颖的液-液萃取过程评估了从实际的海上采出水样品中去除油脂的能力，然后在基于相转化的混合沉降器中进行了有效的相分离。在这种新方法中，从海上石油生产平台收集的凝析油-平均油流成分被用作萃取溶剂，以去除主要溶解的化合物。这种策略性方法在业界被认为是史无前例的，它可以使石油生产商克服许多后勤方面的挑战，还可以减少投入品的消耗和成本。在分批测试中，还将合成的冷凝水势与正己烷和正庚烷进行了比较。根据结果​​，溶剂浓度和pH值对萃取效率有重要影响。仅在pH值为4和溶剂比为1:10时，获得了优异的去除效率。在研究中观察到的另一个重要结果是混合沉降器的性能，它可以实现瞬时相分离，并具有较高的萃取效率。在10％（v / v）的冷凝水，10 L / h的流速和pH为4的情况下，所应用的工艺能够在单个萃取步骤中达到巴西国家环境委员会的指导规定的排污要求。根据标准方法5520 – B（分配重量法）测得的最终出口物流中的油脂含量低于29 mg / L。