Theo Nash
N-butyl alcohol, also known as 1-butanol, is a primary alcohol with the chemical formula C4H9OH. It is a popular solvent and is used in the production of varnishes, perfumes, and plastics. It is also a potential biofuel. N-butyl alcohol has a low acute toxicity and is considered safe for use in cosmetics. However, it is flammable and requires proper personal protective equipment to prevent skin and eye contact. While heat can affect solubility, n-butyl alcohol is not freely soluble in water due to its four-carbon group size and the hydrophobic nature of its long chain molecules.
| Characteristics | Values |
|---|---|
| Chemical formula | C4H9OH |
| Structure | Linear |
| Isomers | Isobutanol, butan-2-ol, tert-butanol |
| Fermentation | Occurs naturally as a minor product of the ethanol fermentation of sugars and other saccharides |
| Uses | Varnishes, perfumes, artificial flavourings, synthetic intermediates, potential biofuel |
| Toxicity | Relatively low |
| Flammability | High |
| Solubility | Limited |
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What You'll Learn
N-butyl alcohol's flammability
N-butyl alcohol, also known as 1-butanol, butan-1-ol, or n-butanol, is a flammable liquid. It has a flash point of between 73°F and 100°F, which means it has a very low flash point. Due to its flammability, it is classified as a Class IC Flammable Liquid. N-butyl alcohol is a colourless liquid with a strong, characteristic, mildly alcoholic odour. It is produced in small quantities in nearly all fermentations and is present in many foods and drinks, including beer, grape brandies, wine, and whisky. It is also used in a wide range of consumer products, such as artificial leather, rubber cement, dyes, perfumes, and safety glass.
The National Institute for Occupational Safety and Health (NIOSH) provides guidelines for the safe handling of n-butyl alcohol. According to NIOSH, it is important to prevent skin and eye contact with the chemical. If it comes into contact with the skin, the affected area should be washed immediately. If it comes into contact with the eyes, they should be irrigated immediately with large amounts of water. Work clothing that becomes wet with n-butyl alcohol should be removed immediately due to its flammability hazard. Additionally, Tychem® and Tyvek® fabrics should be avoided around n-butyl alcohol, as they are not suitable for use around heat, flames, sparks, or in potentially flammable or explosive environments.
When fighting a fire involving n-butyl alcohol, it is important to eliminate all ignition sources from the immediate area, such as smoking, flares, sparks, or flames. Water spray may be used to reduce vapors, but it may not prevent ignition in closed spaces. For small fires, dry chemical, CO2, water spray, or alcohol-resistant foam can be used. However, dry chemical extinguishers should not be used for fires involving nitromethane or nitroethane. For large fires, water spray, fog, or alcohol-resistant foam can be used, but straight or solid streams should not be aimed directly onto the product. If possible, undamaged containers should be moved away from the area around the fire. In the case of a fire involving tanks, rail tank cars, or highway tanks, the fire should be fought from a maximum distance using unmanned master stream devices or monitor nozzles. Containers should be cooled with flooding quantities of water until well after the fire is out.
N-butyl alcohol is also reactive and can form explosive compounds when mixed with certain substances. For example, mixtures with concentrated sulfuric acid and strong hydrogen peroxide can cause explosions. It can also react with hypochlorous acid to form explosive butyl hypochlorite. Therefore, it is important to use caution and isolate any spills or leaks of n-butyl alcohol to prevent potential hazards.
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Its use as a solvent
N-butyl alcohol, also known as 1-butanol, butan-1-ol, or n-butanol, is a primary alcohol with the chemical formula C4H9OH. It is one of four butyl alcohol isomers, along with secondary (sec-) butyl alcohol, isobutyl alcohol, and tertiary (t-) butyl alcohol. All four of these alcohols have significant industrial applications, particularly as solvents.
N-butyl alcohol is a versatile solvent with a wide range of applications. One of its major uses is as a solvent for paints, resins, and other coatings. It is also a component of hydraulic brake fluids. Due to its solvent properties, it is used in the production of varnishes, with 85% of its use attributed to this application.
N-butyl alcohol is also a precursor to various esters, which are compounds formed by the reaction of an acid with an alcohol. These esters have diverse applications. For example, butyl acetate, derived from n-butyl alcohol, is used as a paint solvent and as an artificial flavorant. Additionally, dibutyl phthalate, another ester, is employed as a plasticizer to prevent plastics from becoming brittle.
In the food and beverage industry, n-butyl alcohol is used as an artificial flavorant in the United States. It is added to a variety of products, including butter, cream, fruit, rum, whiskey, ice cream, candy, baked goods, and cordials. It occurs naturally in small quantities in many alcoholic beverages, such as beer, grape brandies, wine, and whisky, as a result of carbohydrate fermentation.
Furthermore, n-butyl alcohol finds application in the extraction of lipid-free protein from egg yolk, natural flavouring materials, and vegetable oils. It is also used in the manufacture of hop extract for beermaking and as a solvent to remove pigments from moist curd leaf protein concentrate.
While n-butyl alcohol has diverse and valuable uses, it is important to handle it with caution due to its flammability and potential health hazards. It has a low flash point, and proper protective equipment and precautions are necessary to ensure safe use.
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N-butanol's toxicity
N-butanol, also known as butan-1-ol or 1-butanol, is a primary alcohol with a chemical formula of C4H9OH and a linear structure. It is used as an ingredient in processed and artificial flavourings, and for the extraction of lipid-free protein from egg yolk, natural flavouring materials, and vegetable oils. It is also used in the manufacture of hop extract for beermaking and as a solvent in removing pigments from moist curd leaf protein concentrate.
N-butanol has a relatively low acute toxicity, with oral LD50 values of 790-4,360 mg/kg in rats. To put this into context, comparable values for ethanol are 7,000-15,000 mg/kg. At sub-lethal doses, N-butanol acts as a depressant of the central nervous system, similar to ethanol.
As a precaution, it is important to prevent skin and eye contact with N-butanol. In the case of skin contact, it is recommended to immediately wash the skin with large amounts of water. If the chemical comes into contact with the eyes, they should be irrigated immediately, occasionally lifting the lower and upper lids. Work clothing that becomes contaminated with N-butanol should be removed immediately due to its flammability hazard. N-butanol has a very low flash point, and water spray may be inefficient when fighting a fire involving this chemical. Instead, dry chemical, CO2, water spray, or alcohol-resistant foam can be used.
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Its solubility in water
N-butyl alcohol, also known as 1-butanol, butan-1-ol, or n-butanol, is a primary alcohol with the chemical formula C4H9OH. It has a linear structure and is produced in small quantities in nearly all fermentations. It is a popular solvent, for example, for nitrocellulose.
N-butyl alcohol is considered a hazardous chemical. DuPont specifically warns against using Tychem® and Tyvek® fabrics around heat, flames, or sparks when working with this chemical. It is also flammable, with a very low flash point. When fighting a fire involving n-butyl alcohol, a water spray may be inefficient.
Regarding its solubility in water, n-butanol is one of the "fusel alcohols" (from the German for "bad liquor"), which include alcohols that have more than two carbon atoms and have significant solubility in water. Butan-1-ol occurs naturally as a result of carbohydrate fermentation in a number of alcoholic beverages, including beer, grape brandies, wine, and whiskey. It is also formed during the deep frying of certain oils, such as corn oil and cottonseed oil.
In summary, n-butyl alcohol is a hazardous chemical that is flammable and has significant solubility in water. It is naturally present in some alcoholic beverages and is produced during the fermentation process and deep frying of certain oils.
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N-butyl alcohol's role in synthetic flavourings
N-butyl alcohol, also known as 1-butanol, is a primary alcohol with the chemical formula C4H9OH. It has a linear structure and is one of four butyl alcohols, along with secondary (sec-butyl) alcohol, isobutyl alcohol, and tertiary (t-butyl) alcohol. N-butyl alcohol has various industrial applications, including as a solvent for paints, resins, and other coatings, and as a component of hydraulic brake fluids.
One of the significant uses of 1-butanol is in the production of synthetic flavourings and fragrances. It is a permitted artificial flavorant in the United States, used in a variety of food and beverage products, including butter, cream, fruit, rum, whiskey, ice cream, candy, baked goods, and cordials. It is also used in perfumes and cosmetics.
1-Butanol is produced through the fermentation of sugars and other saccharides and is present in many foods and drinks, including beer, grape brandies, wine, and whiskey. It is also formed during the deep frying of certain oils, such as corn oil and cottonseed oil. Additionally, 1-butanol is used in the extraction of lipid-free protein from egg yolk, natural flavouring materials, and vegetable oils.
The largest use of 1-butanol is as an industrial intermediate, particularly for the manufacture of butyl acetate, which is an artificial flavorant and industrial solvent. Butyl acetate is produced through esterification reactions using butanol and butyrate as precursors. This process can be achieved through traditional methods or by employing microorganisms in a one-pot reaction.
N-butyl alcohol is commercially produced by the fermentation of corn (maize) or molasses or by the condensation and reduction of acetaldehyde. It has a low acute toxicity, but it can act as a central nervous system depressant at sub-lethal doses, similar to ethanol. When working with n-butyl alcohol, it is important to take safety precautions due to its flammability and potential hazards to the skin and eyes.
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Frequently asked questions
N-butyl alcohol, also known as 1-butanol, is a non-polar molecule with a hydrophobic alkyl chain. In order to dissolve in water, there must be attractive interactions between the molecule and water. Water molecules are less attracted to the hydrophobic alkyl chain as it gets longer, making it harder for them to separate.
Solubility is determined by the free energy, ΔG. If ΔG is negative, the substance will dissolve. ΔG can be calculated using the formula ΔG = ΔH - TΔS, where ΔH is the heat of interaction between the molecules, T is temperature, and S is entropy or the degree of randomness.
N-butyl alcohol is flammable and has a very low flash point. It can be harmful to the skin and eyes, so it is important to wear appropriate protective clothing, including eye protection. If it comes into contact with the eyes, immediately irrigate them with water. Work clothing that becomes wet should be removed immediately.
