Environmentally benign anti-icing or deicing fluids

Abstract

Deicing compositions comprised of hydroxyl-containing organic compounds and / or organic acid salts are disclosed.

Description

CROSS REFERENCES TO RELATED APPLICATIONS [0001] This application is a divisional application of application Ser. No. 11 / 522,690, filed Sep. 18, 2006, which in turn is a continuation of application Ser. No. 11 / 103,753, filed Apr. 12, 2005, now U.S. Pat. No. 7,138,071, issued Nov. 21, 2006, which in turn is a continuation of Ser. No. 10 / 341,540, filed Jan. 13, 2003, now abandoned, which in turn is a continuation-in-part of application Ser. No. 09 / 675,495, filed Sep. 29, 2000, now U.S. Pat. No. 6,506,318, issued Jan. 14, 2003, which in turn is a continuation-in-part of application Ser. No. 09 / 436,811, filed Nov. 9, 1999, now U.S. Pat. No. 6,129,857, issued Oct. 10, 2000, which in turn is a continuation of application Ser. No. 09 / 161,865, filed Sep. 28, 1998, now U.S. Pat. No. 5,980,774, issued Nov. 9, 1999, which in turn is a continuation-in-part of application Ser. No. 08 / 940,936, filed Sep. 30, 1997, now U.S. Pat. No. 5,876,621, issued Mar. 2, 1999.FIELD OF THE INVENTION [0002] The p...

AI Technical Summary

Benefits of technology

"The present invention provides a deicing and anti-icing composition that includes glycerols and water, as well as an organic acid salt or other inorganic salt. The composition can be applied to surfaces, such as airplanes, to prevent ice formation and remove frozen water. The invention also provides a method for reducing the amount of inorganic salt needed for effective deicing and anti-icing. The composition can be made from recycled or recovered glycols, and can be used on a wide range of surfaces, including metallic and non-metallic surfaces."

Problems solved by technology

Chloride salts however suffer from relatively severe drawbacks, such as the harmful effects on surrounding vegetation by preventing water absorption in the root systems, the corrosive effects on animal skin such as the feet of animals, clothing, roadways and motor vehicles, and the deleterious effects on surface and ground water.

However, the use of chloride salts often is not permitted or needs to be reduced in certain areas because of its highly corrosive nature, which causes destruction of surrounding vegetation, damage to roadways and vehicles, and contamination of water supplies.

Another drawback of certain prior art deicing fluids is the high chemical and biological oxygen demand that make them environmentally unfavorable.

However, these glycol compounds likewise have environmental drawbacks and can be detrimental to sewage treatment processes.

Other prior art deicing fluids, such as alcohols, have toxic effects and high volatility particularly in the low molecular weight range and may be the cause of offensive smell and fire danger.

Furthermore, mono- and polyhydric alcohols oxidize in the presence of atmospheric oxygen to form acids, which can increase corrosion of materials.

These specifications are such that many technologies, including existing glycol-based fluids currently used commercially, no longer meet the new requirements, including ASTM D 1177.