PTMEG Technology

Polytetramethylene ether glycol (PTMEG) is the premium component for a wide variety of polyurethanes, polyesters, and polyamide elastomers. It reacts with isocyanates or organic acids to form elastomers. Primary end-uses include spandex, castable polyurethanes, thermoplastic polyurethanes, polyurethane coatings and sealants. KTS licenses PTMEG technology with more than two decades of proven commercial performance.


  • Robust and efficient process based on INVISTA’s patented PTMEG process and catalyst.
  • Low capital cost:
    • Highly active catalyst.
    • Constructed with stainless steel and carbon steel.
    • Continuous Methanolysis eliminating the need for multiple reactors in series.
  • Over 20 years of commercial operation.
  • PTMEG product made using this process is qualified for all major end uses.

How It Works

The chemistry for KTS’ patented ACAN process for converting THF to PTMEG:

The first step in the process polymerizes THF into PTMEA in the presence of a strong acid catalyst. Our process utilizes a proprietary catalyst specifically developed for this process. The high activity of the catalyst allows for a relatively small reactor and associated CAPEX. The product molecular weight is controlled by the addition of ACAN which coupled with the low residence time allows for quick transitions between product grades. The PTMEA is converted to PTMEG in a reactive distillation column. After removal of the methanolysis catalyst, the oligomers and low molecular weight fractions are removed from the product in the narrowing step and recycled to the PTMEA reactor. The final product has a narrow molecular weight distribution that is ideal for use in the downstream spandex and polyurethanes markets.


KTS can offer a comprehensive technology package that includes a Process and Basic Design Package (PBDP), technology and operating know-how, market knowledge and project execution resources. The size of the plant can be configured to meet the needs of the client. KTS also offers on-going technical services and the potential to enter into off-take agreements with its licensees.

Let’s Work Together

Working together, we can leverage our exclusive technologies, expertise, and capabilities to help you reduce capital investment, lower operational costs, and boost productivity.

Let’s get started.