In the production processes of the petrochemical, vegetable oil refining, and pharmaceutical synthesis industries, large volumes of industrial wastewater containing naphthenic acid are generated. This type of wastewater is complex in composition, features high COD levels, and is severely emulsified. Traditional treatment methods—such as chemical demulsification and biological treatment—often suffer from long process flows, high costs, and low efficiency, and they are unable to effectively recover valuable naphthenic acid. As a result, not only are resources wasted, but significant environmental pressures are also created.
Today, this long-standing industry challenge has an efficient solution. The CWL-M Series Centrifugal Extractor launched by Zhengzhou Tiei Extraction Technology Co., Ltd. offers advanced technology and exceptional performance, opening a new pathway for the treatment and resource recovery of naphthenic-acid-containing wastewater.
CWL-M Centrifugal Extractor Process for Treating Naphthenic Acid Wastewater
- 1.Mixing and Mass Transfer
The wastewater and extractant are fed into the CWL-M centrifugal extractor. Driven by the high-speed rotation of the drum, the two liquid phases undergo intense shear and mixing, creating a large interfacial area for mass transfer. Naphthenic acid molecules in the wastewater rapidly transfer from the aqueous phase to the extractant phase, completing the mass-transfer process. - 2.Centrifugal Separation
Under the action of a strong centrifugal force field, the denser aqueous phase and the lighter organic extractant phase (loaded with naphthenic acid) are rapidly and distinctly separated. This process takes only a few seconds and achieves far better separation than traditional gravity settling. - 3.Discharge of the Two Phases
The separated heavy phase (purified wastewater) and light phase (naphthenic-acid-rich extractant) are continuously and stably discharged through separate outlet channels. - 4.Post-Treatment
Extract treatment: The naphthenic-acid-rich extract enters the stripping unit, where pH adjustment and other methods are used to separate naphthenic acid from the organic phase, producing high-purity naphthenic acid and achieving resource recovery. The extractant can be recycled and reused.
Effluent treatment: After extraction, the wastewater exhibits significantly reduced COD, petroleum content, and naphthenic acid concentration. It can then be easily fed into subsequent biological treatment systems for advanced processing to ensure compliant discharge or reuse.
The Four Core Values of the CWL-M Centrifugal Extractor
The core of the centrifugal extractor lies in utilizing density differences and high-speed centrifugal force to achieve rapid mixing and complete separation of two-phase liquids. Compared to traditional methods, the CWL-M centrifugal extractor demonstrates unparalleled advantages in treating naphthenic acid wastewater:
- 1.High Efficiency, Small Footprint
Fast processing speed and a compact design save significant time and space. - 2.Superior Performance with Clear Effluent
Powerful demulsification and thorough phase separation reduce COD at the source and ensure stable compliance with discharge standards. - 3.Excellent Economic Benefits—Turning Waste into Value
Efficient recovery of naphthenic acid creates direct economic returns, allowing environmental investments to generate profit. - 4.Safer and More Worry-Free
Fully enclosed operation with no exhaust leakage, plus automated control, significantly reduces labor intensity and safety risks.
Successful Application Cases
The centrifugal extraction technology developed by Zhengzhou Tiei Extraction has been successfully applied in multiple petrochemical and chemical enterprises. For example, after a major petrochemical company adopted the CWL-M Series Centrifugal Extractor to treat its naphthenic-acid-containing wastewater, the effluent quality not only consistently met discharge standards, but the load on the downstream biological treatment system was significantly reduced. Moreover, the company achieved resource recovery of naphthenic acid, with an expected payback period of just 2–3 years—delivering both environmental and economic benefits.
Zhengzhou Tiei Extraction CWL-M Centrifugal Extractor offers an efficient, economical, and resource-oriented new pathway for the treatment of naphthenic-acid-containing wastewater. If you would like to learn more about the centrifugal extractor applications in related fields, please feel free to contact us.
Email: sales@tieiextraction.com
Whatsapp: +86 19069612820
