Eutectic Depressants: Relationship of Eutectic, Freezing Point, and Ice Melting Capacity in Liquid Deicers

Work has been done in recent years to try to increase the ice melting performance of liquid deicers by manipulation of the eutectic temperature of the composition. For example, it has been shown that addition of a variety of organic compounds to common liquid deicing chemicals such as magnesium chloride cause a significant decrease in the liquid’s freezing point. This has been sometimes interpreted as indicating a lowered eutectic temperature for the composition, which in turn may be expected to result in a lower effective temperature range for deicing. While there have been numerous reports of lowered freezing points measured in these organic–inorganic blended liquids, there has been little ice melting capacity data available. The author has undertaken a study to better understand the effect of additives on the eutectic temperature and resulting ice melting capacity of liquid inorganic deicers. Data on organic freeze point depressants in liquid magnesium chloride and potassium carbonate deicing solutions are presented to explore the relationship between freezing points, eutectic temperatures, and ice melting capacity at different temperatures. Data on some experimental formulas indicate that the actual ice melting capacity of a composition can not necessarily be simply predicted based upon the apparent eutectic temperature alone. The data are explained by a consideration of both the thermodynamic factors involved in the chemical deicing process, which are related to the eutectic temperature, together with kinetic factors, which are not accounted for in the strictly thermodynamic measurement of the eutectic.

Language

  • English

Media Info

  • Media Type: Web
  • Features: Figures; References; Tables;
  • Pagination: pp 73-84
  • Monograph Title: Surface Transportation Weather and Snow Removal and Ice Control Technology: Fourth National Conference on Surface Transportation Weather and Seventh International Symposium on Snow Removal and Ice Control Technology, June 16-19, 2008, Indianapolis, Indiana
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01103949
  • Record Type: Publication
  • Report/Paper Numbers: Snow08-008
  • Files: TRIS, TRB
  • Created Date: Jun 25 2008 2:42PM