Monograph of Inhibited Propylene Glycol

Basic information

IUPAC name: propane-1,2-diol

Synonyms: 1,2-dihydroxypropane, methyl ethyl glycol, Sirlene, Dowfrost

Applications:

Appearance: viscid pink liquid

Molecular formula: C3H8O2

Molecular mass: 76.09 g/mol

Melting point: -59°C

Boiling point: 187.6°C

Density: 1.04 g/cm3

Viscosity: 91.41 cp (10.45°C)

Surface tension: 40.1 g/s2 (25°C)

Refractive index: 1.4324 (20°C)

Vapor pressure: 0.2 mmHg (23°C)

Vapor density: 2.62 (air=1)

Refractive index: 1.4324 (20°C)

Partition coefficient: -0.92 pKow

Heat of vaporization: 66.27 kJ/mol

Heat of combustion: -1828 kJ/mol

Production:

Inhibited propylene glycol is usually sourced from either propylene oxide or glycerol. Production is more or less similar with glycerin, using either catalytic (150°-180°C) or non-catalytic high-temperature process (200°-220°C). An ion exchange resin or a small amount of sulfuric acid or alkali is frequently used. Final products include 20% propylene glycol, 1.5% dipropylene glycol, and  other polypropylene glycols. Then, resulting glycols are further distilled to be purified prior to storage and distribution. To assure high quality and  compliance with hygienic standards, production is monitored and controlled
through a track-and-trace system from the start of process up to delivery point.
 

Storage and handling 

Store substance in a tightly lidded container and away from incompatible chemicals. Protect from moisture and store in a cool, dry, and well-ventilated area. After handling, wash hands thoroughly. Avoid contact with eyes, skin, and clothing. In case of contamination, remove tainted clothing and wash
thoroughly before reuse. Avoid inhalation and ingestion.

References:
Wikipedia - http://en.wikipedia.org/wiki/Propylene_glycol

University of Akron Chemical Database

Cefic

Common Applications of Inhibited Propylene Glycol

Inhibited propylene glycol is an organic double alcohol widely utilized for controlling several industrial functions like secondary cooling and heating applications, anti-freeze and bursting protection for pipes during colder months, various defrosting, de-icing, and dehumidifying purposes.

Inhibited propylene glycol in IUPAC nomenclature is propane-1,2-diol. Its single atom has three carbon atoms, eight hydrogen atoms, and two oxygen atoms represented by the formula C3H8O2. Pure propylene glycol is synthesized through the hydration of propylene oxide. Its other industrial
applications include foods, toiletries, and cosmetic products to serve as humectant and preservative.

Other Usages:

•Chillers
•Cold room dehumidifiers
•Heat recovery
•Boilers
•Refrigeration coil defrosting
•Sidewalk snow-melt systems
•Refrigeration warehouse floor heating
•Liquid food chillers
•Outdoor wood boilers
•Freeze/burst/corrosion protection for HVAC system
•Thermal energy storage (TES) systems
•Air preheating
•Immersion freezing or chilling for solid, wrapped foods
•Ground source heat pumps
•Process heating and chilling
•Moderate temperature batch processing
•Conveyor roller defrosting
•Fermentation and indirect food cooling
•Solar heating
•Ice skating rinks
•Beverage processing for wines and beers
•Radiant floor heating
•Hydronic heating systems

Different glycol fluids are used for the same functions because of their similarity in physical characteristics though propylene glycol is one of the safest glycol to use. Its freeze and burst protection is slightly better, though in comparison to other derivatives, it poses minimal environmental contamination or toxicity.

Corrosion Inhibited Propylene Glycol

95% Corrosion Inhibited Propylene Glycol is a low hazard, propylene glycol based heat transfer fluid concentrate for use in closed water systems. The corrosion inhibitor package provides an effective combination of inhibitors for steel, cast iron, copper, cupric alloys, and aluminum. 

95% Corrosion Inhibited Propylene Glycol is designed to be used in systems requiring freeze protection. Deionized water solutions of this product can be made to meet your specifications.