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Propylene Glycol - Assignment Example

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This paper aims at evaluating one of the organic compounds, propylene glycol. In order to attain this objective, the paper will look into the properties of this substance, its production and industrial application. The paper will describe the main effect on human and on the environment…
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Propylene Glycol
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Download file to see previous pages PG is also known under the name 1,2-propylene glycol, 1,2-dihydroxypropane, 1,2-propanediol, ethylene glycol, and methyl glycol. The proper IUPAC chemical name is propane-1,2-diol. Its CAS Registry Number on the U.S. EPA Toxic Substances Control Act (TSCA) inventory of chemical substances is [57-55-6]. Common commercial names of this substance are Propylene Glycol Industrial (PGI) and Propylene Glycol USP (PG USP) (Martin and Murphy, 2006).
The physical properties of propylene glycol are presented in Table 1. All of the glycols are very miscible with water, ethanol, acetone, and chloroform. Propylene glycol is also a hygroscopic compound (Martin and Murphy, 2006).
The structural formula of propylene glycol is given in figure 1. Its structural isomer with the same formula is 1,3-propanediol. PG has also two enantiomers: one is (R)-1,2-propanediol and the other is (S)-1,2-propanediol. This compound has two functional hydroxyl group: primary and secondary that distinguish it from the ethylene glycol (McKetta, 1993).
Chemical properties of propylene glycol are typical for this group of compounds. It undergoes the reactions with carboxylic acids, and their derivatives (halides and anhydrides) forming esters; reaction with hydroxides of alkali metals forming salts, and interaction with aldehydes and ketones where the products are acetals and ketals. The reaction with acids is important for obtaining polyesters. The next important commercial product is polyether obtained by dehydration of propylene glycol. Reactions with aldehydes and ketones are used for protection of aldehyde or ketone functionality in organic synthesis (Martin and Murphy, 2006).
Propylene glycol is used in organic synthesis, synthesis of polymers, medicine, and cosmetics. Its mixture of water has the low freezing point and, thus, this compound is used as antifreeze.  ...Download file to see next pagesRead More
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One such product is 1,2-propanediol (propylene glycol), a chemical feedstock produced using the metabolic pathway engineering approach. 1,2-Propanediol is a colorless and clear liquid that has a high boiling point1. It is very hygroscopic in pure form. Industrially, it is a very useful product.
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