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