Theo Nash
Tert-butyl alcohol is a solvent with a freezing point of 25.5°C. It is a tertiary alcohol, with the formula (CH3)3COH, and is one of the four isomers of butanol. It is a colorless solid that melts near room temperature and has a camphor-like odor. In this article, we will explore the unique properties of tert-butyl alcohol, including its freezing point, and how it differs from other isomers of butanol.
| Characteristics | Values | |
|---|---|---|
| Chemical Formula | (CH3)3COH | |
| Other Names | t-BuOH, butan-1-ol, 2-methylpropan-2-ol, t-butanol, 2-methyl-2-propanol, 2-propanol, tertiary butyl alcohol, t-butyl alcohol | |
| Appearance | White crystalline solid or colorless liquid (above 77 °F) | |
| Odor | Camphor-like | |
| Solubility | Soluble in water, ethanol, diethyl ether, alcohol, ether, and other organic solvents | |
| Hazard Class | 3 | |
| Labels | Flammable liquid | |
| Uses | Solvent for paints, lacquers, varnishes, natural and synthetic resins, gums, vegetable oils, dyes, camphor, alkaloids, perfumes, artificial musk, fruit essences, flavors, and pharmaceutical and chemical manufacturing |
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What You'll Learn
Tert-butyl alcohol's chemical formula
Tert-butyl alcohol, also known as tert-butanol, is a tertiary alcohol with the chemical formula (CH3)3COH, sometimes represented as t-BuOH. It is a simple tertiary alcohol and the simplest of its kind. It has no hydrogen atom next to the hydroxy group, which makes it resistant to oxidation to carbonyl compounds.
Tert-butyl alcohol is derived commercially as a coproduct of propylene oxide production from isobutane. It can also be produced through the catalytic hydration of isobutylene or by a Grignard reaction between acetone and methylmagnesium chloride. Tert-butyl alcohol is used as a solvent, ethanol denaturant, paint remover, and gasoline octane booster and oxygenate. It is also used in the production of methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE) through reactions with methanol and ethanol, respectively.
The chemical formula for tert-butyl alcohol, (CH3)3COH, reflects its molecular structure. In this formula, 'CH3' represents a methyl group, which is a carbon atom bonded to three hydrogen atoms. There are three methyl groups (hence the '3' in the formula) bonded to a carbon atom, which is indicated by 'C'. This central carbon atom is also bonded to a hydroxyl group, represented by 'OH', which consists of an oxygen atom bonded to a hydrogen atom.
The hydroxyl group in tert-butyl alcohol is responsible for its classification as an alcohol. Alcohols are organic compounds that contain a hydroxyl group (-OH) bonded to a carbon atom, which is exactly what we see in tert-butyl alcohol's chemical formula. The arrangement of these functional groups gives tert-butyl alcohol its unique chemical properties and behaviour.
Tert-butyl alcohol is a colourless solid with a camphor-like odour. It melts near room temperature and is miscible with water, ethanol, and diethyl ether. It has been identified in beer and chickpeas, and is also found in cassava, which is used in the fermentation process for certain alcoholic beverages. While its toxicity is generally low, high doses of tert-butyl alcohol can produce a sedative or anesthetic effect.
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Its physical properties
Tert-butyl alcohol, also known as tert-butanol, is the simplest tertiary alcohol, with the formula (CH3)3COH (or t-BuOH for short). As a tertiary alcohol, it lacks a hydrogen atom next to the hydroxy group, making it resistant to oxidation to carbonyl compounds. Tert-butyl alcohol is derived commercially as a coproduct of propylene oxide production from isobutane. It can also be produced through the catalytic hydration of isobutylene or by a Grignard reaction between acetone and methylmagnesium chloride.
Tert-butyl alcohol is a colourless solid with a melting point near room temperature and a camphor-like odour. It is miscible with water, ethanol, and diethyl ether. Tert-butyl alcohol has been identified in a variety of natural sources, including beer, chickpeas, and cassava, which is used in the fermentation process of certain alcoholic beverages.
In terms of its reactivity, tert-butyl alcohol can be deprotonated with a strong base to form an alkoxide, specifically potassium tert-butoxide when treated with potassium metal. This alkoxide is a potent, non-nucleophilic base in organic chemistry, capable of abstracting acidic protons from substrates. However, its steric bulk prevents it from participating in nucleophilic substitutions, such as Williamson ether synthesis or SN2 reactions. Tert-butyl alcohol also reacts with hydrogen chloride to form tert-butyl chloride, and with hypochlorous acid to yield tert-butyl hypochlorite.
Purification of tert-butyl alcohol is challenging due to the formation of an azeotrope with water. However, initial drying of the solvent containing high water levels can be achieved by adding benzene to create a tertiary azeotrope and distilling off the water. While tert-butyl alcohol has been studied in the context of chemistry and industrial processes, there is limited data available regarding its pharmacology and toxicology in humans and other animals.
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Commercial synthesis
Tert-Butyl alcohol (TBA) is commercially derived from isobutane as a coproduct of propylene oxide production. It can also be produced through the catalytic hydration of isobutylene, or by a Grignard reaction between acetone and methylmagnesium chloride.
Catalytic Hydration of Isobutylene
One of the common methods for the commercial synthesis of tert-butyl alcohol is through the catalytic hydration of isobutylene. This process involves reacting isobutylene with water in the presence of a catalyst. The catalyst used is typically a strong acid, such as phosphoric acid, and the reaction takes place in the liquid phase. The equation for this reaction is as follows:
$$
\ce{CH2=C(CH3)2 + H2O ->[\ce{H+}] [CH3]3COH}
$$
This reaction is reversible and highly selective toward the formation of tert-butyl alcohol. It is often carried out in a fixed-bed reactor, where the conversion of isobutylene can reach up to 70%.
Coproduct of Propylene Oxide Production
Tert-butyl alcohol is also commercially derived as a coproduct during the production of propylene oxide. The ARCO process, for instance, produces tert-butyl alcohol as a major by-product. This process involves the reaction of propylene with an oxidizing agent, typically hydrogen peroxide, to form propylene oxide. Tert-butyl alcohol is formed as an intermediate or by-product in this reaction.
Grignard Reaction
Another method for the commercial synthesis of tert-butyl alcohol is through a Grignard reaction. This involves reacting acetone with methylmagnesium chloride in the presence of a Grignard reagent, such as methylmagnesium iodide. The equation for this reaction is as follows:
$$
\ce{CH3COCH3 + CH3MgI ->[\ce{H2O}] (CH3)3COH + Mg(OH)2}
$$
This reaction is often used as an alternative to the catalytic hydration of isobutylene when specific reaction conditions or product requirements are needed.
Purification and Distillation
The purification and distillation of tert-butyl alcohol is a critical aspect of its commercial synthesis. Simple distillation cannot be used due to the formation of an azeotrope with water. Instead, initial drying of the solvent containing large amounts of water is achieved by adding benzene to form a tertiary azeotrope, which can then be distilled off. Smaller amounts of water are removed through drying agents such as calcium oxide (CaO), potassium carbonate (K2CO3), calcium sulfate (CaSO4), or magnesium sulfate (MgSO4).
Anhydrous tert-butyl alcohol, which is free from water, can be obtained through further refluxing and distilling from magnesium activated with iodine or alkali metals like sodium or potassium. This ensures a high purity of the final product.
Applications in Chemical Synthesis
Tert-butyl alcohol is an important intermediate in various chemical synthesis processes. For example, it is used in the production of ethyl tert-butyl ether (ETBE), which is a gasoline additive that helps reduce carbon monoxide and unburned hydrocarbon emissions. The reaction involves the etherification of ethanol (EtOH) and tert-butyl alcohol under atmospheric pressure, catalyzed by strong acid cation-exchange resins.
Additionally, tert-butyl alcohol is used in the synthesis of tertiary butyl-hydroquinone (TBHQ), an antioxidant, through a reaction with hydroquinone in the presence of a Friedel-Crafts catalyst. This reaction typically involves mixing hydroquinone with phosphoric acid in a toluene solvent, followed by the addition of tert-butyl alcohol at elevated temperatures.
In conclusion, the commercial synthesis of tert-butyl alcohol involves multiple chemical reactions and processes, each tailored to specific requirements and applications. The purification and distillation steps are critical to obtaining a high-purity product, and tert-butyl alcohol's role as an intermediate in various chemical syntheses underscores its importance in the chemical industry.
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Tert-butyl alcohol's uses
Tert-butyl alcohol, also known as tert-butanol, is the simplest tertiary alcohol, with the formula (CH3)3COH (or t-BuOH for short). It is a colourless solid with a camphor-like odour, and it melts near room temperature. Tert-butyl alcohol has a range of uses and applications across various fields, including chemistry, biology, and industry. Here are some of its key uses:
Chemical Reagent and Solvent: Tert-butyl alcohol is used as a chemical reagent and solvent in organic chemistry. It is resistant to oxidation due to the absence of a hydrogen atom next to its hydroxy group. This property allows it to react with other substances to form compounds such as tert-butyl chloride and tert-butyl hypochlorite. Tert-butyl alcohol is also used to produce alkoxides, particularly potassium tert-butoxide, which is a strong and commonly used base.
Commercial and Industrial Applications: Tert-butyl alcohol is derived commercially as a coproduct of propylene oxide production from isobutane. It is also produced industrially through the catalytic hydration of isobutylene or by a Grignard reaction between acetone and methylmagnesium chloride. Tert-butyl alcohol is used as a fermentation ingredient in certain alcoholic beverages, particularly those made from cassava. It has also been identified as a naturally occurring compound in beer and chickpeas.
Pharmaceutical and Biological Uses: While limited data exists on the pharmacology and toxicology of tert-butanol in humans and animals, it is known that it can be irritating to the skin and eyes. Human exposure can occur through fuel oxygenate metabolism, inhalation, or ingestion. High doses of tert-butyl alcohol can produce sedative or anesthetic effects, indicating potential pharmaceutical applications.
Research and Academic Studies: Tert-butyl alcohol is studied in academic and research settings to understand its chemical properties, reactivity, and potential applications. Its unique structure and reactivity as a tertiary alcohol make it a subject of interest in organic chemistry and chemical synthesis.
The freezing point of tert-butyl alcohol is not readily available, but it is known to melt near room temperature.
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Safety considerations
Tert-butyl alcohol, also known as tert-butanol or TBA, is a tertiary alcohol that exists as a colorless solid or liquid with a distinct camphor-like odor. It has a formula of (CH3)3COH. While it has various industrial applications, several safety considerations must be kept in mind when handling this compound.
First and foremost, tert-butyl alcohol is a combustible solid and flammable liquid with a flashpoint below 73°F and a boiling point above 100°F. This means that it can easily ignite and cause fires or explosions under certain conditions. Therefore, it is crucial to prevent skin and eye contact with this substance, and if exposure occurs, immediate irrigation and decontamination are necessary. The flammable nature of tert-butyl alcohol also dictates that it should be removed when wet to mitigate the risk of fire.
Secondly, according to the US Environmental Protection Agency (EPA), tert-butyl alcohol has shown "suggestive evidence of carcinogenic potential" based on studies conducted on animals. Specifically, it has been associated with an increased incidence of renal adenomas and carcinomas, as well as thyroid adenomas in mice. This indicates that exposure to tert-butyl alcohol may pose a potential cancer risk, particularly through oral and inhalation routes.
Additionally, there is limited data available on the pharmacology and toxicology of tert-butyl alcohol in humans and other animals. This lack of comprehensive understanding underscores the importance of cautious handling and adherence to safety protocols when working with this compound.
Furthermore, tert-butyl alcohol is resistant to oxidation due to the absence of a hydrogen atom next to the hydroxy group. This resistance can impact its reactivity and stability in chemical reactions, and it is important to consider this property when utilizing tert-butyl alcohol in various applications.
In conclusion, while tert-butyl alcohol has its industrial uses, it is crucial to approach its handling with caution. Safety considerations include preventing skin and eye contact, addressing accidental exposure promptly, being vigilant about its flammability, being aware of its potential carcinogenic effects, and recognizing the limitations in our understanding of its toxicological properties. Adherence to safety protocols and the use of personal protective equipment are essential when working with tert-butyl alcohol.
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Frequently asked questions
The freezing point of tert-butyl alcohol is 25.5°C.
Tert-butyl alcohol is a solid that melts near room temperature.
Tert-butyl alcohol is the simplest tertiary alcohol with a formula of (CH3)3COH.
The formula for calculating the freezing point of a solution is: ΔTf = Kf x m.
Tert-butyl alcohol is a solvent and has been identified in beer and chickpeas. It is also found in cassava, which is used in certain alcoholic beverages.
