3D model (JSmol)
|E number||E1519 (additional chemicals)|
|Molar mass||108.14 g·mol−1|
|Density||1.044 g cm−3|
|Melting point||−15.2 °C (4.6 °F; 257.9 K)|
|Boiling point||205.3 °C (401.5 °F; 478.4 K)|
|3.50 g/100 mL (20 °C) |
4.29 g/100 mL (25 °C)
|Solubility in other solvents||Soluble[vague] in benzene, methanol, chloroform, ethanol, ether, acetone|
|Vapor pressure||0.18 kPa (60 °C)|
Refractive index (nD)
|217.8 J/K mol|
Std enthalpy of
|Safety data sheet||External MSDS|
|Flash point||93 °C (199 °F; 366 K)|
|436 °C (817 °F; 709 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
|1250 mg/kg (rat, oral)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Benzyl alcohol is an aromatic alcohol with the formula C6H5CH2OH. The benzyl group is often abbreviated "Bn" (not to be confused with "Bz" which is used for benzoyl), thus benzyl alcohol is denoted as BnOH. Benzyl alcohol is a colorless liquid with a mild pleasant aromatic odor. It is a useful solvent due to its polarity, low toxicity, and low vapor pressure. Benzyl alcohol has moderate solubility in water (4 g/100 mL) and is miscible in alcohols and diethyl ether. The anion produced by deprotonation of the alcohol group is known as benzylate or benzyloxide.
Benzyl alcohol is produced naturally by many plants and is commonly found in fruits and teas. It is also found in a variety of essential oils including jasmine, hyacinth, and ylang-ylang. It is also found in castoreum from the castor sacs of beavers.
- C6H5CH2Cl + NaOH → C6H5CH2OH + NaCl
- C6H5CH2OH + NCCHCH2 → C6H5CH2N(H)C(O)CHCH2
Benzyl alcohol is used as a general solvent for inks, waxes, shellacs, paints, lacquers, and epoxy resin coatings. Thus it can be used in paint strippers, especially when combined with compatible viscosity enhancers to encourage the mixture to cling to painted surfaces. It is a precursor to a variety of esters, used in the soap, perfume, and flavor industries. It is also used in e-liquid for e-cigarettes to enhance the flavors used. When applied to damaged skin or mucous membranes at a 10% concentration it acts as a local anesthetic and antimicrobial agent, and is sometimes included as a degreaser in rug cleaning products. As a dye solvent, it enhances the process of dying wool, nylon, and leather. It also has use as a photographic developer, and as an insect repellent.
Use in health care
Benzyl alcohol is used as a bacteriostatic preservative at low concentration in intravenous medications, cosmetics and topical drugs.
The use of benzyl alcohol as a 5% solution has been approved by the U.S. FDA for the treatment of head lice in children older than 6 months and in adults. It affects the louse's spiracles, preventing them from closing. These then become clogged with water or mineral oil or other matter and cause the insect to die from asphyxiation.
Benzyl alcohol is used effectively for treating lice infestations as the active ingredient in lotion shampoo with 5% benzyl alcohol.
Benzyl alcohol has nearly the same refraction index as quartz and wool fiber. If a clear quartz object is immersed in benzyl alcohol, it becomes almost invisible. This test has been used to determine non-destructively whether an object is truly made of quartz (see crystal skull). Similarly, white wool immersed in benzyl alcohol also becomes almost invisible clearly revealing contaminants such as dark and medullated fibers and vegetable matter.
Benzyl alcohol is an ingredient used in the manufacture of soaps, topical creams, skin lotions, shampoos, and facial cleansers and is popular due to its anti-bacterial and anti-fungal properties. It is a common ingredient in a variety of household products and can cause severe allergic contact dermatitis in a significant percentage of the population.
Benzyl alcohol has low acute toxicity with an LD50 of 1.2 g/kg in rats. It oxidizes rapidly in healthy individuals to benzoic acid, conjugated with glycine in the liver, and excreted as hippuric acid. Very high concentrations can result in toxic effects including respiratory failure, vasodilation, hypotension, convulsions, and paralysis.
Benzyl alcohol is not considered to be a carcinogen and no data are available regarding teratogenic or reproductive effects.
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