Water-miscible liquids propylene glycol

Water-miscible liquids include polyethylene glycols (PEG) and non-ionic surfactants, such as the poly-sorbates. Low molecular weight grades of PEG (e.g., PEG 400) are used most commonly as they remain liquid at ambient temperatures. Small amounts (up to 5-10%) of other water-miscible liquids, such as propylene glycol, ethanol, and glycerin, can also be used. 

Properties and handling. You can tell from the applications that propylene glycol is safe. It is nontoxic, nonflammable, and even fit for human consumption (in small doses). It is a colorless, odorless, sweet-tasting liquid, completely miscible or soluble in water. Propylene glycol is available in three grades NF (99.99%), technical (99%), and industrial (95%)-... 

Propylene Glycol occurs as a clear, colorless, viscous liquid. It absorbs moisture when exposed to moist air. It is miscible with water, with acetone, and with chloroform in all proportions. It is soluble in ether and will dissolve many essential oils, but is immiscible with fixed oils. 

Sorbitol Solution occurs as a clear, colorless, syrupy liquid. It is a water solution of sorbitol (C6H1406) containing a small amount of mannitol and other isomeric polyhydric alcohols. It is miscible with water, with ethanol, with glycerin, and with propylene glycol. It sometimes separates into crystalline masses. 

NEB and almost all chemical reactions in foods are thought to cease in systems that are below a of 0.23 to 0.43, the typical range of the moisture monolayer value (Labuza et al., 1969 Rockland and Nishi, 1980). In Figure 20.5b, this trend appeared as expected for the control formulation, which contained no humectant. However, upon the addition of hydrophilic glycols as humectants (which were liquids at the test temperature and thus miscible in water), the at which the maximum reaction rate occurred shifted to a much lower value. Propylene glycol showed a maximum rate at a of about 0.2, with a rate equal to the maximum rate of the control at a a of 0.8. 

Gcraniat, light oily liquid. Strong lemon odor. bpM 92-93. dj° 0.8888. 1.48982. Practically insol in water. Miscible with ale, ether, benzyl benzoate, diethyl phthalate. glycerol, propylene glycol, miueral oil, essential oils. 

Pale yellow or (usually) brownish-black, thick, viscous liquid. Bituminous odor. Miscible with water, glycerol, propylene glycol, fats, oils, carbowaxes, lanolin. Partially so) in alcohol, ether. 

Due to hydrogen bonding, 1,2-ethanediol (ethylene glycol) and 1,2-propanediol (propylene glycol) are both high-boiling liquids that are completely miscible with water. 

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