[Haichuan’s Insights] The butter emission reduction project at Yanshan Petrochemical’s ethylene plant is expected to generate additional profits of around 4.5 million yuan

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The alkali washing system of the ethylene plant at Yanshan Petrochemical produces approximately 1,500 tons of butter per year. This yellow, amorphous oily precipitate suspends in alkaline solutions, and upon heating or oxidation it tends to form scale, causing blockages in the equipment used for treating waste alkali. At the same time, the annual cost for handling hazardous waste amounts to around 6 million yuan. Recently, the butter emission reduction project for the ethylene plant at Yanshan Petrochemical was officially put into operation. This project changes the previous approach to disposing of butter by mixing it with pyrolysis gasoline for extraction before sending it to a quenching system for recovery; it is expected to save approximately 3 million yuan in costs associated with the disposal of hazardous waste each year. At the same time, the production of pyrolysis gasoline can increase by about 1,500 tons per year, which is expected to generate additional profits of around 4.5 million yuan. After the project is put into operation, the butter emission reduction device mixes butter with pyrolysis gasoline, allows it to settle and separate into layers, washes it, thereby separating the butter from the waste alkali, and sends it to the quenching system for recovery ； Meanwhile, the remaining waste alkali solution is continued to be sent to the waste alkali treatment device for processing. This approach not only significantly reduces the amount of alkali used in the washing process of ethylene plants, eliminating production instability caused by blockages in the equipment for treating waste alkali, but it also greatly cuts down on the costs associated with handling hazardous waste, thereby achieving both cost reduction and improved efficiency as well as better environmental protection.