In industries such as new energy materials and polymer synthesis, N-Methyl-2-pyrrolidone (NMP) is widely used as a high-performance solvent. However, its high-concentration wastewater, due to its complete miscibility with water, high boiling point, and difficulty in direct separation, has become an environmental problem hindering the sustainable development of these industries. Facing the limitations of traditional distillation methods, such as high energy consumption, clogging, and low recovery rates, Zhengzhou Tiei Extraction has proposed an innovative solution based on the CWL-M series centrifugal extractor. Through a coupled extraction-distillation process, this solution achieves efficient recovery of NMP and resource utilization of wastewater.
The centrifugal extraction process is based on the principle of liquid-liquid phase distribution. It uses proprietary extraction agents such as chloroform and toluene, which have selective affinity with NMP, to achieve mass transfer separation in a centrifugal field. The wastewater and extraction agents are rapidly mixed to form a large phase interface, allowing the NMP component to quickly transfer from the aqueous phase to the organic phase. This process operates at room temperature, avoiding the energy waste and thermal degradation of heat-sensitive substances associated with high-temperature distillation. It is especially suitable for complex wastewater systems containing inorganic salts such as calcium chloride, fundamentally solving the issues of scaling and clogging.
The CWL-M series centrifugal extractor adopts a vertical fully sealed structure. Two-phase materials enter the high-speed rotating mixing chamber, where mass transfer is fully completed in the precisely designed flow paths. Under the influence of strong centrifugal force, the light phase (extract phase) and heavy phase (raffinate phase) quickly separate along different paths and are collected separately. The centrifugal extractor integrates an intelligent control system, allowing real-time adjustments to key parameters such as speed and flow rate, ensuring a stable separation efficiency of over 98%. The multi-stage countercurrent extraction design reduces the NMP content in the final raffinate to the 10⁻⁵ level, achieving nearly 100% extraction recovery.
This process has been successfully validated in multiple industrial scenarios. For the complex wastewater produced by the aramid industry, with NMP content of 40-55% and salt content of 5-10%, this technology optimizes the ratio of extraction agents and operating parameters. It recovers high-purity NMP while effectively avoiding the damage caused by inorganic salt deposition on the equipment.
In an application at a new energy materials company, the CWL250-M centrifugal extractor, combined with chloroform as the extraction agent, achieved stable continuous operation. The NMP recovery rate exceeded 98.5%, and the energy consumption for treating one ton of water was reduced by over 60% compared to traditional distillation methods, significantly shortening the investment payback period.
Tiei Extraction provides full-process technical support from process development to engineering scale-up. Through small-scale and pilot-scale verification, we can customize efficient and stable solutions for customers, helping companies achieve both environmental compliance and resource regeneration goals.
Email: sales@tieiextraction.com
Whatsapp: +86 19069612820
