Methanol to olefin (MTO) process is a chemical technology for producing low-carbon olefins from coal-based or natural gas-based methanol. It has changed the pattern of low-carbon olefins relying on petroleum cracking, and opened a new process for producing low-carbon olefins. However, the wastewater generated in the MTO process is difficult to handle. Numbering-up of mini-hydrocyclone is often used to enhance the processing capacity of wastewater treatment when mini-hydrocyclone is used for oil-water separation in methanol-to-olefin process. In this paper, the efficiency and pressure drop distribution of a single mini-hydrocyclone were studied in the laboratory. In addition, according to the UU parallel configuration model, 150 mini-hydrocyclones arranged in parallel were established and used for the oil-water separation process of methanol-to-olefin reaction wastewater. The industrial operation results show that the average flow rate of long-period operation is 282 m³/h, the average pressure drop was 0.31 MPa, and the average separation efficiency of the mini-hydrocyclone group was 90 %. Especially for heavy components such as alkanes and aromatics, it had a good separation effect. Thus, it is shown that the mini-hydrocyclone group has good applicability in oil-water separation.

甲醇制烯烃（MTO）工艺是一种从煤基或天然气基甲醇生产低碳烯烃的化学技术。它改变了依靠石油裂化的低碳烯烃的格局，并开辟了生产低碳烯烃的新工艺。但是，MTO过程中产生的废水难以处理。当将微型水力旋流器用于甲醇制烯烃工艺中的油水分离时，微型水力旋流器的编号通常用于增强废水处理的处理能力。本文在实验室中研究了单个微型水力旋流器的效率和压降分布。另外，根据U在平行构型模型下，建立了150个平行排列的小型水力旋流器，用于甲醇制烯烃反应废水的油水分离过程。工业运行结果表明，长时间运行的平均流量为282 m ³ / h，平均压降为0.31 MPa，小型旋流器组的平均分离效率为90％。特别是对于重组分，如烷烃和芳烃，它具有良好的分离效果。因此，表明微型水力旋流器基团在油水分离中具有良好的适用性。