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NMP Distillation System

NMP Distillation System

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NMP Distillation System

The NMP distillation system is a highly efficient and energy-saving solvent purification equipment, specifically designed for the recovery of NMP (N-Methyl-2-Pyrrolidone) solvent from the lithium battery cathode coating process. Utilizing multi-tower continuous distillation technology, it ensures an NMP purity of ≥99.9% and a moisture content of ≤200ppm, meeting the stringent requirements for solvent quality in lithium battery production. The system integrates heat recovery and reuse technology, reducing energy consumption by over 30%, and is equipped with a PLC automatic control system and modular design, enabling fully automated operation and flexible expansion. Compliant with ATEX explosion-proof standards, it ensures safe and reliable operation. Widely used in lithium battery manufacturing, chemical, electronics, and pharmaceutical industries, the NMP distillation system, with its high efficiency, energy-saving, and eco-friendly features, provides customers with sustainable solutions, helping to reduce costs, improve efficiency, and achieve green production goals.

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    NMP Recycling Equipment

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    Application field：
       Suitable for solvent recovery in the manufacturing line of mass-produced battery cells.


    Equipment advantage：
      Operational flexibility: The distillation system takes about 12 hours from start-up to steady state, and about 4 hours for normal shutdown;
      The operation has great flexibility, and the feeding amount can vary between 60% and 120% of the design amount.

      Stable operation: Use DCS automatic control system and set PID parameters reasonably; Set upper and lower limit alarm values for important temperatures and liquid levels to ensure smooth operation of the production process.


      More guaranteed quality and raw material supply: Materials are transported in a sealed mode within pipelines, without contact with air, to reduce the introduction of impurities; The materials are circulated within the factory area, reducing uncontrollable steps such as procurement and transportation of raw materials.

      Low operating cost: The operating cost of distillation in plant is 50% less than the external processing cost.

    Process Principle：
    If the mixed liquid is heated to boiling but only partially vaporized, the high volatility components, i.e. the components with low boiling points (called volatile components or light components), will have a higher concentration in the vapor phase than in the liquid phase, while the low volatility components, i.e. the components with high boiling points (called non-volatile components or heavy components) will have a higher concentration in the liquid phase than in the vapor phase. Similarly, when the vapor portion of a mixture condenses, the concentration of non-volatile components in the condensate is higher than in the vapor phase, and vice versa. After multiple partial vaporization or partial condensation, relatively pure volatile components can be obtained in the vapor phase, while relatively pure non-volatile components can be obtained in the liquid phase.

    Process Flow：
    NMP Three-tower Distillation Process：
    22233
    System composition: 1#Dehydrating tower +2#Dehydrating tower + 3#Refining tower + 4#Batch tower (optional) + Waste gas treatment

    NMP Two-tower Distillation Process：
    55555

    System Composition: 1#Dehydrating tower + 2#Refining tower + 3#Batch tower (optional) + Waste gas treatment