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Glycerol's properties make it useful for numerous applications. The three hydroxyl groups in glycerol allow extensive hydrogen bonding that gives glycerol its characteristic syrupy viscous texture and hygroscopic character. Approximately 40% of glycerol's use is for personal care products such as cosmetics, soaps, shampoos, lotions, mouthwash, and toothpaste. Glycerol's hygroscopic properties make it a good moisturizer in skin products. Another 25% of glycerol's annual production is used in food production. In the food industry glycerol is used as a moistening agent, as a solvent for food coloring and syrups, to prevent crystallization of sugar in candies and icings, as a preservative, and as a sweetening agent. Approximately 10% of glycerol's use goes into tobacco processing, where it is sprayed on tobacco leaves before they are shredded to serve as a moistening agent. Glycerol has the added benefit of imparting a sweet taste to chewing tobacco. The remaining 25% of glycerol's use is distributed among various industrial uses. It is used in cough syrups and elixir medicines. In industry, glycerol is found in lubricants, plasticizers, adhesives, antifreezes, resins, and insulating foams. At one time it was used almost exclusively in its nitrated form as an explosive (see Nitroglycerin), which today accounts for about 3% of its use.
Pure glycerol appears as colorless, odorless and sweet viscous liquid. Boiling point: 290 ° C, melting point: 17.9 ° C, the relative density: 1.2613. It can be miscible with water infinitely. It can be dissolved in 11 times ethyl acetate, about 500 times ether. It is insoluble in benzene, chloroform, carbon tetrachloride, carbon disulfide, petroleum ether and oil. Anhydrous glycerol has a strong water absorption property.Glycerol is weakly acidic, being able to react with alkaline hydroxide. For example, it reaction with copper hydroxide can produce bright blue cupric glycerinate (can be used to identify polyols). Glycerol can react with nitric acid to generate glyceryl trinitrate, also known as nitroglycerin, being a strong explosive.Because glycerol has water absorption property, it is often used as the moisturizing agent of cosmetics, leather, tobacco, food and textile. Glycerol also has effect on lubricating the intestine, being able to be used for enema or suppository treatment of constipation. Nitroglycerides have the effect of dilating coronary arteries and can be used to treat angina. Nitroglycerin can be used as an explosive and propellant. Glycerol can react with binary acid to generate alkyd resin, widely being used in paints and coatings.In nature, glycerol is widely presented in the form of esters. For example, a variety of animal and vegetable oils are glycerol carboxylate with hydrolyzing grease being capable to generate fatty acids and glycerol. At present, one of the major sources of glycerol is the byproduct of the soap industry (grease is hydrolyzed under alkaline conditions). The other major source is from petroleum pyrolysis gas, propylene.
Guidechem assumes no responsibility or liability for any errors or omissions in the content of this site. The information contained in this site is provided on an “as is” basis with no guarantees of completeness, accuracy, usefulness, fitness for purpose or timeliness.
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