DuPont Tate and Lyle Bio Products

DuPont Tate & Lyle Zemea Propanediol Zemea USP Susterra Propanediol

Solar Thermal

Glycol for Solar Thermal Systems

Susterra® Propanediol: High Performance Glycol for Solar Thermal Systems

There are many brands of propylene glycol-based fluids. Susterra® propanediol offers solar thermal systems improved performance than other glycols on the market. Switch to a Susterra® propanediol solar thermal fluid and take advantage of the biobased glycol that will decrease fluid degradation and system corrosion and improve the efficiency of your solar thermal installations.

Susterra® propanediol is used for a range of heat transfer fluids. Susterra® is certified, 100 percent biobased by the U.S. Department of Agriculture, making it attractive for companies seeking to add renewable content to their products.  Susterra® propanediol is a petroleum-free PG and EG alternative.

High Performance Glycol:

  • Higher boiling point vs. PG.
  • Less thermal degradation compared to PG.
  • Delivers excellent freeze point depression for aqueous solution applications.
  • Demonstrates improved viscosity at lower temperatures compared to PG.
  • Contributes to LEED points.

Sustainable Glycol:

  • Susterra® is a 100% USDA bio-based material, renewably and sustainably sourced.
  • Susterra® provides low toxicity, safety, and is readily biodegradable.
  • Petroleum free - PG Alternative
  • Susterra® consumes 40% less energy and reduces greenhouse gas emissions by more than 40% vs. petroleum-based 1,3-propanediol and propylene glycol. LCA

Susterra®-based Heat Transfer Fluid Has Improved Thermal Stability vs. PG-Based Fluid

Susterra®-based Heat Transfer  Fluid Has Improved Thermal Stability vs. PG-Based Fluid

Experiment Results:

The PDO-containing heat transfer fluid was shown to have improved stability to thermal decomposition when compared to EG or PG-containing heat transfer fluids. Lower levels of thermal degradation in heat transfer fluid products improves overall stability of the fluid, resulting in a lower corrosion potential for components in the heat transfer system, and a longer lifetime of the fluid.

Experiment Design:

This experiment was conducted to evaluate relative stability of three glycol-based inhibited heat transfer fluids. Glycols (all 99% purity) were: Ethylene glycol, 1, 3-propanediol, and propylene glycol. Water used for dilution (deionized to 18 megOhms) to a final concentration of 50% based on volume was inhibited (2.2% Penray #2792). The diluted, inhibited fluids were boiled in a reflux system for 16 hours at 192 ± 10°C. This period of reflux was intended to simulate a stagnant high thermal event for a semi-closed loop heat transfer system.

The following analytical measurements were performed on heat transfer fluids that were sampled during the trial:

  • Visual appearance

  • GC-MS: Agilent Technologies 7820A/5975 MSD Innowax 19091N-133 (30m x 0.25mm x 0.25µm) 50° to 250°C at 1.5 mL/min (He)

  • Agilent 8453 UV-Visible Spectrophotometer

  • Conductivity & pH Denver Instrument 250

  • ICP-AES Optima 2100 DV

  • Water content by volumetric Karl Fischer Mettler Toledo V20

  • Antek 9000HN