Production of polyurethane with LEWA process diaphragm pumps

Toluenediamine (TDA) as preliminary product and diaminotoluene (MDI), as well as toluene diisocyanate (TDI) as intermediate produce play an important role in the production of polyurethane. TDA is produced by the reaction of dinitrotoluene (DNT) and the use of nickel-raney as a catalyst; both fluids require an absolute process safe and precise metering.

Reliable conveying with LEWA pumps from preliminary and intermediate products during polyurethane production have made us known as a partner for safety and reliability in this sector.


Advantages of LEWA process diaphragm pumps

  • Hermetically tight (important for isocyanates)
  • High working pressures are possible
  • Suspension capability (nickel-raney catalyst)
  • Safe in continuous operation
  • Very high availability and reliability (optimized for continuous operation)
  • Low life cycle costs

Source graphics/diagrams: February 2012

Diagramm of polyurethane prodution in the plastics industry
Diagramm of polyurethane prodution in the plastics industry

Areas of application

Polyurethanes (PUR) belong to the most important polymers.

The technical area of application of PUR goes from "PUR soles" to "PUR foam". The main area of application of polyurethane is the use of foam, e.g., for upholstered furniture, mattresses, sponges, winter clothing, coating for carpets, constructional foam for thermal insulation, packing material, etc.

They are also used as paint and adhesives, as thermoplastic plastics for the production of rollers, rolls, and as elastomers and fibers, e.g. as elastane.


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