The average amount of waste lye produced by the catalytic and gas separation plant of Dalian Petrochemical Company is 5,000 tons per year. If it is not handled properly, it will cause air, soil, and water pollution. Yesterday, with the formal operation and commissioning of the waste alkali treatment plant of Dalian Petrochemical Engineering Company, this environmental protection "major" was completely resolved. This set of the largest and most technologically advanced waste lye treatment plant in our city can not only recycle waste lye, but also extract high-grade paint solvents. The waste gas meets the standard emission, which can be described as multiple purposes and realizes the economy. Benefits and social benefits are both good harvests.

It is understood that this device is the first waste lye treatment device in China that uses fiber membrane separation technology and oxidation regeneration technology. After two years of hard work, Dalian Petrochemical Engineering Co., Ltd. has invested more than 50 million yuan to build it, with an annual processing capacity of 10,000 yuan. cubic meter. Scientific treatment of high concentrations of sulfides and refractory organics in spent lye can be described as a "good trick." According to reports, the device is mainly composed of a phenol-containing lye treatment system and a sulfur-containing lye treatment system. The phenol content of the treated phenol lye will be reduced by more than 95%, and the sulfur content of the treated sulfur-containing phenol lye will be lower than 70 mg/L by sulphur, which ensures the controllable treatment of the spent alkali. The regenerated alkali formed after the treatment can be used for sewage treatment and flue gas desulfurization and realize recycling; the recovered crude phenol is used as a high-grade paint solvent, etc., with high added value, and is calculated according to 10,000 tons of waste lye treated in one year. Phenol extraction up to 300 tons.

According to relevant person in charge of Dalian Petrochemical Company, in the past, the company had to pay a certain fee to transport waste caustic liquor to the factory for processing, and also had to spend a fortune to purchase new alkali liquor, and this set of equipment enabled the spent caustic solution to be recycled in the plant. Use, saving the purchase of new alkali and transportation, processing costs, and more importantly, this device also enables Dalian Petrochemical Company to achieve a complete step to achieve "zero emissions" through energy-saving emission reduction. According to reports, this environmental protection device that meets the requirements of the circular economy will also “go out” Dalian Petrochemical Company to provide services for other petrochemical enterprises.

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