Driven by the global push toward resource recycling and green manufacturing, waste lubricating oil regeneration has become a key pillar of sustainable development in the petrochemical industry. Traditional regeneration processes face multiple challenges, including low efficiency, high energy consumption, difficult solvent recovery, and inconsistent product purity.
Leveraging its deep technical expertise in liquid–liquid extraction, Zhengzhou Tiei Extraction Technology Co., Ltd. introduces an innovative solution—the CWL-M Series Centrifugal Extractor. Specially engineered to optimize the NMP (N-methyl-2-pyrrolidone) refining process for waste lubricating oils, the CWL-M series centrifugal extractor enables enterprises to achieve efficient, environmentally friendly, and cost-effective lubricant regeneration.

The core of the entire regeneration process lies in three stages of deep purification:

1.Vacuum Distillation
The process begins with vacuum distillation, during which light and heavy components in the waste oil are precisely separated. This yields preliminary distillate oil, preparing the feedstock for subsequent extraction.

2.Solvent Extraction for High-Purity Refining
This is the critical stage of the process. The distillate oil is treated using the CWL-M centrifugal extractor for lubricating oil refining, with the polar solvent NMP serving as the extractant. This step efficiently removes undesirable components such as resins and oxidation products, leaving behind a high-quality raffinate.

3.Solvent Recovery
The extract phase is treated with an aqueous solution, allowing the base oil to be efficiently separated, while the organic solvent is recovered at an almost 100% rate and recycled back to the extraction section. This closed-loop operation enables truly green, waste-free production.

Addressing the key pain points of NMP-based lubricating oil refining processes, Tiei Extraction has independently developed the groundbreaking CWL-M Centrifugal Extractor. Compared with traditional equipment, it offers the following advantages:

1.Superior Mass Transfer with Second-Level Separation
The high-speed rotating drum inside the centrifugal extractor generates strong centrifugal force, allowing the NMP solvent and waste oil phases to be finely dispersed and thoroughly mixed within an extremely short time, achieving rapid mass transfer. Subsequently, under the same powerful centrifugal field, the two phases are clearly and quickly separated according to their density differences.
2.Multi-Stage Integration with Minimal Footprint
The CWL-M centrifugal extractor uses a multi-stage extraction unit to complete the multi-stage countercurrent extraction and washing process required for NMP refining of waste oil. The equipment volume is only a fraction of that of traditional equipment, greatly saving factory space and reducing infrastructure investment.
3.Thorough Solvent Recovery with Substantially Reduced Costs
The strong centrifugal separation ensures highly efficient phase separation between the extract and raffinate phases, resulting in extremely low solvent carryover of NMP in the oil phase, typically reduced to the ppm level. This not only enhances base oil purity but also markedly reduces the load and energy consumption of downstream solvent recovery systems. As a result, the recovery rate of valuable NMP solvent is greatly improved, directly lowering production costs.
4.Stable Operation with Outstanding Product Quality
The fully enclosed, automated, and continuous operation mode, combined with precisely adjustable process parameters, ensures stable production of high-quality regenerated base oil under varying feed conditions. Key performance indicators such as color, viscosity index, and oxidation stability are significantly improved, meeting or even exceeding the standards required for high-end applications.

Turning waste into value, extracting the essence. In the race toward a circular economy, choosing efficient and reliable equipment is the key to success. The CWL-M Centrifugal Extractor from Zhengzhou Tiei Extraction empowers waste oil regeneration with cutting-edge technology, enabling precise purification, cost reduction, efficiency enhancement, and a decisive step toward a greener future.
Email: sales@tieiextraction.com
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