In the petrochemical and coal chemical industries, high-concentration, highly emulsified, and poorly biodegradable naphthenic acid wastewater has long been a major challenge for enterprises in meeting discharge standards and controlling costs. Traditional treatment methods are inefficient, time-consuming, and costly. How can we achieve a win-win solution of efficient treatment and resource recovery?

Efficient Solvent Extraction Process – Precise Recovery and Purification

Solvent extraction is the ideal process for treating naphthenic acid wastewater, and the choice of extraction equipment directly determines the treatment efficiency and economic benefits. By combining the solvent extractionBy combining the solvent extraction method with the advanced technology of Tiei Extraction CWL-M series centrifugal extractor, wastewater can be effectively treated and resources recovered:
1.Pre-treatment: Removal of suspended solids, floating oil, and part of the emulsified oil to protect the centrifugal extractor from clogging or performance decline.
2.Extraction: Wastewater and the selected extractant are efficiently mixed and reacted inside the centrifugal extractor, where naphthenic acid and other organics are rapidly extracted into the organic phase.
3.Separation: With centrifugal force thousands of times greater than gravity, the oil–water two-phase separation is achieved instantly, efficiently, and thoroughly.
4.Stripping & Recovery: The loaded organic phase undergoes a stripping process to recover valuable naphthenic acid, while the extractant is regenerated and reused, significantly reducing operating costs.
5.Advanced Treatment: After extraction, COD and other parameters of the wastewater are significantly reduced, enabling smooth integration into subsequent biochemical or other treatment processes to ensure stable compliance with discharge standards.

CWL-M Centrifugal Extractor

Compared with traditional extraction column or mixer-settler, the centrifugal extractor is the core equipment for process upgrading, offering unparalleled advantages:
1.Instant Extraction: Harnessing centrifugal force thousands of times greater than gravity, two-phase mixing and mass transfer are completed within seconds, boosting efficiency by several times.
2.Powerful Demulsification: Effectively overcomes stubborn emulsification issues, ensuring complete oil–water separation and superior effluent quality.
3.Continuous Automation: Fully enclosed continuous operation with one-touch start/stop, greatly reducing labor and maintenance costs.
4.Minimal Footprint: A single unit can replace bulky traditional systems, enabling easy and efficient process retrofitting.

Adopting the process of “Pre-treatment + Centrifugal Extraction + Stripping & Recovery” for naphthenic acid wastewater treatment is an advanced technology that integrates high-efficiency purification, resource recovery, and economic benefits. Among them, the centrifugal extractor serves as the core equipment. With its outstanding advantages of high efficiency, rapid processing, powerful demulsification, and easy automation, it perfectly addresses the traditional challenges of naphthenic acid wastewater treatment. It has become one of the key technologies and essential equipment for modern refining and chemical enterprises to achieve clean production and sustainable development.
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