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N-Methyl-2-pyrrolidon (NMP)

White spirit

  • CAS
    872-50-4
  • Structural formula

    C₅H₉NO

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Remove N-methyl-2-pyrrolidone (NMP) from the exhaust air

What is N-methyl-2-pyrrolidone?

N-methyl-2-pyrrolidone (NMP) is a colorless to slightly yellowish, highly polar solvent with a faint amine-like odor. It is used in a wide range of industrial applications, including the manufacture of coatings, paints, varnishes, cleaning agents, and as a reaction medium in chemical synthesis. Due to its good solubility in many organic and inorganic substances, NMP is particularly important in the electronics and pharmaceutical industries.

Production

NMP is mainly produced by the reaction of gamma-butyrolactone (GBL) with methylamine. This synthesis usually takes place in a closed system under elevated pressure and temperature. The end product is purified by distillation to remove impurities and ensure high purity.

Identification

NMP is a clear, hygroscopic liquid that is completely miscible with water and many organic solvents. It has a mild, amine-like odor, but this is often barely perceptible at low concentrations. Due to its hygroscopicity, NMP easily absorbs moisture from the air and should therefore be stored in tightly sealed containers.

Limit values

The occupational exposure limit (OEL) for NMP in the EU is 10 ppm (40 mg/m³) as a time-weighted average over eight hours. NMP is classified as toxic to reproduction category 1B, which is why exposure must be strictly avoided, especially for pregnant employees.

Hazards

NMP can be absorbed through the skin, respiratory tract, and gastrointestinal tract. It is irritating to the skin and eyes and can cause liver and kidney damage with prolonged exposure. Reproductive toxicity has been scientifically proven. In the environment, NMP is water-soluble and biodegradable, but can harm aquatic organisms at high concentrations.

The oxytec Purification Technology

For many organic pollutants, we offer energy-saving and clean technologies for neutralisation, which we combine in multi-stage plants. In order to achieve a reduction below the limit values, not only the dimensioning of the respective purification stage but also the sequence of the technologies is decisive, as they have different physical effects on the molecules. Below we present some of our purification modules.

Alternative technologies

Other technologies, such as conventional activated carbon filters and simple ventilation systems, often have disadvantages such as high energy consumption, limited cleaning performance, large space requirements, long lead times, and high investment costs.

Advantages of the Oxytec solution

  • Compact design: Low space requirements compared to traditional systems.
  • Environmental friendliness: Minimal environmental impact thanks to innovative technologies.
  • Efficient N-methyl-2-pyrrolidone (NMP) reduction: High cleaning levels with minimal energy consumption.