How a battery manufacturer improved NMP reuse efficiency with a distillation system & Is NMP distillation becoming a standard in lithium battery manufacturing?

erating cost. Many mid-to-large manufacturers face increasing pressure to reduce solvent consumption while maintaining stable production.

The project involves a lithium battery manufacturer with medium production scale, mainly producing cathode materials. The factory already had an NMP recovery system but faced challenges in solvent reuse quality and cost control, including:

• Recovered NMP contained water and impurities
  • Direct reuse affected coating quality
  • High dependence on fresh solvent supply
  • Outsourced treatment increased cost

These issues are common when recovery systems are used without proper purification.

To address these issues, a structured distillation solution is typically applied.

Recovered NMP is collected and stabilized before entering the distillation system.

The system uses two- or three-tower configuration to remove water and impurities under controlled temperature and vacuum conditions.

Purified NMP is returned to the coating process, forming a closed-loop system.

In this case, the manufacturer adopted an integrated NMP distillation solution provided by a customized system manufacturer.

For example, Pengjin’s distillation system uses multi-tower design and controlled process conditions to improve solvent purity and stability.

After implementation:
• NMP purity improved significantly (typically ≥99.9%)
• Water content reduced to low levels (e.g. ≤200 ppm)
• Fresh solvent consumption reduced
• Overall operating cost decreased compared to outsourced treatment

These results are consistent with typical industry expectations for well-designed distillation systems.

• Recovery alone is not enough for cost optimization
  • On-site distillation improves long-term efficiency
  • System integration is more effective than single-unit upgrade

NMP distillation systems are essential for manufacturers aiming to reduce solvent cost and improve process stability.

If your production already includes NMP recovery but still relies on external treatment or fresh solvent, evaluating an integrated distillation solution can be a practical next step.

As lithium battery production scales up globally, solvent management is becoming a key factor in cost control and environmental compliance.

NMP distillation systems are gaining more attention as part of this shift.

Battery manufacturers are moving toward larger-scale and more standardized production. At the same time, solvent consumption is increasing, making recovery and reuse more important.

NMP is a high-cost solvent, and reducing purchase volume is critical for profitability.

Stricter regulations on VOC emissions and solvent handling are being introduced in many regions.

Advances in distillation and process control make on-site purification more stable and practical.

Several trends are becoming clear:
• Higher adoption of closed-loop solvent systems
• Integration of recovery and distillation
• Increased focus on long-term cost efficiency
• More automation in solvent management

Manufacturers are beginning to shift from “how to treat waste solvent” to “how to reuse solvent efficiently.”

This leads to increased demand for integrated solutions that combine recovery, purification, and reuse.

In this context, system-level design becomes more important than individual equipment selection.

Solution providers such as Pengjin offer integrated NMP systems that combine recovery and distillation, helping manufacturers improve reuse efficiency and reduce external dependence.

NMP distillation is becoming an important part of modern lithium battery manufacturing, especially for large-scale production.

For companies planning future capacity or optimizing cost structure, understanding and adopting integrated solvent management solutions can provide long-term benefits.