As global environmental regulations become increasingly stringent and demand for resource recycling increases, waste lubricating oil regeneration technology is facing major changes. N-methylpyrrolidone (NMP) has become a common solvent in waste lubricating oil refining processes due to its excellent solubility selectivity and thermal stability, and the market for NPM lubricating oil refining equipment is developing rapidly. However, the low mass transfer efficiency and large amount of solvent residue in traditional extraction equipment have seriously restricted the improvement of recycled oil quality. The CWL-M centrifugal extractor developed by Zhengzhou Tiei Extraction has brought a breakthrough solution to this field.

Conventional stirred tank and extraction column have obvious defects in the NMP solvent refining process: low mixing efficiency leads to a contact time of 2-3 hours, the solvent retention exceeds 30% of the total system, and it is difficult to achieve continuous production. These pain points urgently need to be solved through equipment upgrades.

Process Innovation of Centrifugal Extraction Technology

The CWL-M centrifugal extractor reconstructs the waste lubricating oil refining process through three technological breakthroughs:

  1. Dynamic enhancement: high-speed shearing forms micron-sized droplets, compressing the mass transfer time to seconds, which is more efficient than traditional equipment.
  2. Process intensiveness: modular design realizes continuous operation of five-stage countercurrent extraction, reduces equipment footprint, and reduces solvent circulation.
  3. Intelligent control: integrated online viscosity monitoring and automatic phase adjustment system, which can optimize the agent-oil ratio in real time (dynamically adjustable from 1:1 to 1:3) to adapt to waste oil raw materials with different aging degrees.

Centrifugal extractor technology solves the efficiency and energy consumption bottlenecks in NMP refining through ultra-gravity rapid separation, increasing the refined oil yield by more than 3% and reducing solvent consumption by 50%. It is the preferred solution for efficient refining of lubricating oil. As a key equipment for green refining technology, the CWL-M series centrifugal extractor is promoting the transformation of the waste lubricating oil regeneration industry towards high efficiency and low carbonization.
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