Mason Delacroix
Cetyl alcohol, also known as hexadecan-1-ol and palmityl alcohol, is a C-16 fatty alcohol with the formula CH3(CH2)15OH. It has a variety of applications, including in cosmetics, lubricants, emulsifiers, insecticides, and detergents. When it comes to observing supercooling for cetyl alcohol, the available literature focuses on its behaviour in mixtures with other substances, such as long-chain alcohols and surfactants. While the cooling rate is known to impact the final texture and rheological properties of these mixtures, the specific effects of supercooling on cetyl alcohol in these experiments are not explicitly mentioned. However, some sources do discuss the crystallization and phase changes that occur during the cooling process, which may be related to supercooling behaviour.
| Characteristics | Values |
|---|---|
| Formula | CH3(CH2)15OH |
| Other Names | Hexadecan-1-ol, palmityl alcohol, cetearyl alcohol, cetostearyl alcohol, cetylstearyl alcohol |
| State at Room Temperature | Waxy white solid or flakes |
| Melting Point | 49.3°C (120.7°F) |
| Uses | Cosmetics, lubricants, emulsifiers, insecticides, detergents |
| Super Cooling | No direct evidence found, but cooling is crucial in the production process to control rheological properties and texture. |
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What You'll Learn
Cetyl alcohol's waxy, white solid form at room temperature
Cetyl alcohol, also known as hexadecan-1-ol and palmityl alcohol, is a C-16 fatty alcohol with the formula CH3(CH2)15OH. At room temperature, it takes the form of a waxy, white solid or flakes. The name 'cetyl' comes from whale oil (cetacea oil), from the Latin 'cetus' meaning 'whale', and from Ancient Greek 'kētos', meaning 'huge fish'.
Cetyl alcohol was discovered in 1817 by the French chemist Michel Chevreul, who heated a waxy substance obtained from sperm whale oil with caustic potash (potassium hydroxide). Modern production is based on the chemical reduction of ethyl palmitate.
The melting point of cetyl alcohol is 49.3°C (120.7°F), which is higher than the average human body temperature. This property makes it useful in cosmetic products like lipsticks, helping lip colour adhere to the skin. It is also used as a thickening agent and emulsifier in skin lotions and creams, and as a binding agent to help keep product ingredients from separating.
In industrial applications, cetyl alcohol is a primary ingredient in fuels, chemical intermediates, and plasticizers. It is also used as a lubricant for nuts and bolts in manufacturing applications. Additionally, it is a multipurpose food additive, used as a flavouring agent or in food decorations, such as the colourful lettering on some types of candy or gum.
People with eczema may be sensitive to cetyl alcohol, although this may be due to impurities rather than the alcohol itself. However, it is sometimes included in medications used for the treatment of eczema.
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The discovery of cetyl alcohol by Michel Chevreul in 1817
Cetyl alcohol, also known as hexadecan-1-ol and palmityl alcohol, is a C-16 fatty alcohol with the formula CH3(CH2)15OH. It was discovered in 1817 by the French chemist Michel Chevreul. At room temperature, cetyl alcohol is a waxy, white solid or a collection of flakes. The name "cetyl" comes from "cetacea oil", which is Latin for "whale oil", from the Ancient Greek "kētos", meaning "huge fish". Cetyl alcohol was first isolated from whale oil.
Chevreul discovered cetyl alcohol by heating a sample of spermaceti (a waxy substance obtained from sperm whale oil) with caustic potash (potassium hydroxide). After the mixture cooled, Chevreul observed that colourless crystals had formed. Although he believed these crystals to be a compound of ethylene and water, later analysis by other researchers in 1836 revealed them to be an alcohol.
Modern production of cetyl alcohol involves the chemical reduction of ethyl palmitate (the waxy ester of palmitic acid) with metallic sodium and alcohol or under acidic conditions with lithium aluminium hydride as a catalyst. It can also be derived from the by-products of the petroleum industry.
Cetyl alcohol has a variety of applications. It is used in the cosmetic industry as an opacifier and in the production of lubricants, emulsifiers, insecticides, and detergents. In dermatological applications, it helps improve the texture of formulations, protect the skin from moisture loss, and reduces the ability of allergens and bacteria to affect the skin. It is also sometimes included in medications used for the treatment of eczema.
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Cetyl alcohol's modern production methods
Cetyl alcohol, also known as hexadecan-1-ol, palmityl alcohol, or C-16, is a fatty alcohol with the formula CH3(CH2)15OH. It was discovered in 1817 by French chemist Michel Chevreul, who heated a waxy substance obtained from sperm whale oil with potassium hydroxide. Modern production methods for cetyl alcohol include:
Chemical Reduction of Ethyl Palmitate
The chemical reduction of ethyl palmitate is a modern production method for cetyl alcohol. This process involves the chemical transformation of ethyl palmitate, a compound derived from palm oil, to produce cetyl alcohol.
Petrochemical Processes
Petrochemical processes are another family of modern methods for producing cetyl alcohol. These processes involve controlled hydrogenation and oxidation reactions in the presence of catalysts, using petrochemical feedstocks as starting materials.
Biotechnological Methods
Biotechnological methods for producing cetyl alcohol involve the use of genetically modified yeasts and bacteria under specific conditions, such as fatty acid starvation. These organisms can synthesize fatty alcohols, including cetyl alcohol, from glucose. This method has been successfully used to produce lauryl, myristyl, cetyl, palmitoleyl, stearyl, and oleyl alcohol.
Natural Sources and Synthesis
Cetyl alcohol can also be derived from natural sources such as coconut oil or synthesized through chemical processes. The source and production method can influence the characteristics of the ingredient. For example, the ratio of cetyl alcohol to other fatty alcohols can affect the consistency and feel of the final product.
Applications
Cetyl alcohol is commonly used in cosmetic, skincare, and hair care products due to its moisturizing, emulsifying, and stabilizing properties. It is also used in industrial processes, such as the production of lubricants, coatings, and chemical formulations.
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The use of cetyl alcohol in cosmetics
Cetyl alcohol is a popular ingredient in cosmetics and skincare products. It is a fatty alcohol derived from fats such as vegetable oils like coconut oil and palm oil, or whale oil, from which it gets its name. It was first isolated from whale oil by French chemist Michel Chevreul in 1817.
In cosmetics, cetyl alcohol acts as an emollient, emulsifier, thickener, opacifier, and surfactant. As an emollient, it helps to soften and smooth the skin, reducing roughness and dryness. It also acts as an occlusive agent, creating a barrier on the skin that seals in moisture and protects against allergens, bacteria, and moisture loss. This protective barrier also helps to prevent creams from separating into oil and liquid, improving the texture and stability of cosmetic products.
The concentration of cetyl alcohol in a formulation will determine the thickness of the final product. It is important to note that while generally considered safe, some people with sensitive skin may find it irritating. It is always recommended to perform a patch test before using any new cosmetic product, especially those containing cetyl alcohol.
Cetyl alcohol is often used in combination with other oils and waxes. For example, cetearyl alcohol is a combination of cetyl alcohol and stearyl alcohol, derived from coconut and palm oils. This combination results in a velvety emollient with thickening and stabilizing properties, making it ideal for use in lotions, hair products, and creams.
The versatility of cetyl alcohol makes it a valuable ingredient in the cosmetic industry, contributing to the development of effective skincare and hair care products.
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Cetearyl alcohol's higher melting point than cetyl alcohol
Cetyl alcohol, also known as hexadecan-1-ol and palmityl alcohol, is a C-16 fatty alcohol with the formula CH3(CH2)15OH. At room temperature, it takes the form of a waxy white solid or flakes. It has a melting point of 49.3°C (120.7°F).
Cetearyl alcohol, on the other hand, is a combination of cetyl alcohol and stearyl alcohol, two fatty alcohols derived from coconut and palm oils. The ratio of the blend can vary, with some common combinations being 30% cetyl and 70% stearyl, or a 50/50 blend. Cetearyl alcohol has a melting point range of 49˚C to 58˚C (120.2˚F to 136.4˚F), with one source specifying a melting point of 50°C (122°F).
As the melting point of pure cetyl alcohol is given as 49.3°C (120.7°F), it is accurate to say that cetearyl alcohol has a higher melting point than cetyl alcohol. This is due to the inclusion of stearyl alcohol, which has a higher melting point than cetyl alcohol.
The higher melting point of cetearyl alcohol can give it a waxy and slightly occlusive feel on the skin, leaving behind a residue after application. It is often used in cosmetics for thickening and stabilizing emulsions, providing a velvety emollient feel.
In hair conditioners, a blend of cetearyl alcohol (30% cetyl and 70% stearyl) is preferred over pure behenyl alcohol, as the latter is more expensive and does not provide additional benefits.
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Frequently asked questions
Cetyl alcohol, also known as hexadecan-1-ol and palmityl alcohol, is a C-16 fatty alcohol with the formula CH3(CH2)15OH. It is a solid organic compound that was first isolated from fats. It is used in cosmetics, lubricants, emulsifiers, insecticides, and detergents.
Supercooling is the process of cooling a liquid below its freezing point without it becoming a solid.
Yes, during experiments with different ratios of cetyl alcohol and oils, the mixtures were cooled and crystallized, forming a hard, dry, and powdery substance.
