Purification of Lubricating and Hydraulic Oils Due to various reasons such as steam, leakage of cooling system, volatile substances and impurities, it is inevitable that they will be mixed into the lubricating oil, which will contaminate the lubricating oil. After the lubricating oil is mixed with water, it will have an affinity with water to emulsify the oil to form an emulsion, which reduces the lubricating performance. At the same time,...