1-Octadecanol

1-Octadecanol, also known as stearyl alcohol, is a long-chain fatty alcohol with the chemical formula C₁₈H₃₈O. It is a white, waxy solid at room temperature and is commonly used in the production of cosmetics, personal care products, and as an emulsifying agent in pharmaceuticals.

Structure and Properties

1-Octadecanol is a saturated fatty alcohol with an 18-carbon chain. Its molecular structure can be represented as CH₃(CH₂)₁₆CH₂OH. The presence of the hydroxyl group (-OH) at the end of the carbon chain classifies it as an alcohol. It has a melting point of approximately 59°C (138°F) and is insoluble in water but soluble in organic solvents such as ethanol and ether.

Production

1-Octadecanol is typically produced through the hydrogenation of stearic acid, which is derived from natural fats and oils. This process involves the addition of hydrogen to the carboxylic acid group of stearic acid, converting it into the corresponding alcohol.

Applications

1-Octadecanol is widely used in the cosmetic and personal care industry due to its emollient properties. It is a common ingredient in:

• Moisturizers
• Conditioners
• Lipsticks
• Lotions

In the pharmaceutical industry, 1-octadecanol is used as an emulsifying agent and a stabilizer in the formulation of creams and ointments. It helps to improve the texture and consistency of these products.

Safety and Environmental Impact

1-Octadecanol is generally considered safe for use in cosmetics and personal care products. It is non-toxic and non-irritating to the skin. However, as with all chemical substances, it should be handled with care to avoid unnecessary exposure.

In terms of environmental impact, 1-octadecanol is biodegradable and does not pose significant risks to aquatic life when used in typical concentrations found in consumer products.

Also see

• Fatty alcohols
• Stearic acid
• Emulsifiers
• Cosmetic chemistry