Arielle Cruz
Denatured alcohol, also known as methylated spirits, meths, or denatured rectified spirit, is ethanol mixed with additives to make it poisonous, foul-smelling, bitter, or nauseating to discourage recreational consumption. The most common additive is methanol (methyl alcohol), which is added to ethanol to make the solution poisonous. Other additives include isopropyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, pyridine, benzene, and castor oil. Denatured alcohol is used as a solvent, fuel for stoves, and in laboratory and medicinal contexts.
| Characteristics | Values |
|---|---|
| Purpose | To make alcohol unfit for human consumption |
| Main additive | Methanol (methyl alcohol) |
| Percentage of main additive | 5-10% |
| Other additives | Pyridine, isopropyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, benzene, castor oil, gasoline, denatonium, denatonium benzoate (bitrex), polyhexamethyleneguanidine, ipecac syrup |
| Effect on ethanol molecule | Does not alter it chemically or structurally |
| Colour | Dyed with methyl violet, crystal violet, methylene blue, or similar |
| Use cases | Fuel, surgical and laboratory stock, cosmetics, disinfectants, household cleaners, hand sanitizers |
| Safety | Dangerous for human consumption, can cause poisoning, blindness, or death |
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What You'll Learn
Why methanol is added to alcohol
Denatured alcohol, also known as methylated spirits, is ethanol mixed with additives to make it unfit for human consumption. It is used as a solvent and as fuel for alcohol burners and camping stoves. It is also used in some types of lab work and as an ingredient in certain products.
Methanol is a common additive used in denatured alcohol. It is added because its boiling point is close to that of ethanol and because it is toxic. Methanol is an alcohol, like ethanol, but with a different chemical structure. Methanol is composed of only one carbon atom, while ethanol has two.
When ingested, methanol is metabolised into formaldehyde and then into formic acid, which poisons the mitochondria of cells. This can lead to severe metabolic acidosis, where too much acid builds up in the body. Symptoms of methanol poisoning include vomiting, abdominal pain, unconsciousness, vision loss, coma, brain damage, and death.
Methanol is sometimes added to alcoholic beverages illegally during or after manufacturing to increase the alcohol content and reduce production costs. This practice is dangerous and can lead to methanol poisoning, which is a global health threat. To prevent the consumption of denatured alcohol, other additives such as denatonium are often added to give the substance an extremely bitter flavour, and substances such as pyridine are added to give it an unpleasant odour.
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Pyridine's role in denaturing alcohol
Denatured alcohol, also known as methylated spirits, is ethanol that has additives to make it poisonous, foul-smelling, bitter-tasting, or nauseating to discourage its consumption. Pyridine is one such additive that is used to make denatured alcohol unfit for human consumption.
Pyridine is a weak base that is added to ethanol to give the mixture an unpleasant odour. Pyridine has a lower pKa, making it a worse nucleophile but a better leaving group, which means the alcohol will have an easier time displacing it. Pyridine is not strong enough to directly remove the alcohol proton. It helps to remove the proton of the intermediate formed after the addition of alcohol to acetyl groups.
Pyridine can act as a nucleophilic catalyst, although DMAP is considered to be better. It is more effective for alcohol acylation because the relative stability of sp3 N+ compared to sp2 N+ limits the attack of the alcohol. Pyridine is also used in the elimination of alcohols to alkenes with POCl3.
Denatured alcohol is used as a solvent and as fuel for alcohol burners and camping stoves. It is also used in laboratory settings, although it is not suitable for certain chemical reactions where the denaturant could interfere. Due to the diverse industrial uses of denatured alcohol, hundreds of additives and denaturing methods have been used. The main additive is usually 10% methanol, and other common additives include isopropyl alcohol, acetone, methyl ethyl ketone, and methyl isobutyl ketone.
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Denatonium: the bittering agent
Denatonium is a quaternary ammonium cation that is used as a bittering agent in denatured alcohol. It is composed as a salt with any of several anions, such as benzoate or saccharinate. Denatonium salts are usually colorless and odorless solids, but they are often traded as solutions.
Denatonium benzoate is the active ingredient in Bitrex, a bittering agent used to deter accidental ingestion of harmful substances and to prevent animals from eating ornamental plants. It is also used to safeguard rat poisons from human consumption, as humans are able to detect denatonium at much lower concentrations than rodents. Denatonium benzoate is also an ingredient in certain nail polishes and varnishes designed to discourage nail biting, as the bitter taste of denatonium serves as an aversive agent.
Denatonium is also used in respirator mask fit-testing, animal repellents, liquid soaps, shampoos, and Nintendo Switch game cards to prevent accidental swallowing or choking by children. It is not known to pose any long-term health risks.
Denatonium is the bitterest chemical compound known, with bitterness thresholds of 0.05 ppm for the benzoate and 0.01 ppm for the saccharinate. It was discovered in 1958 during research on local anesthetics by T. & H. Smith of Edinburgh, Scotland, and registered under the trademark Bitrex.
Denatonium is added to ethanol to denature it and make it unfit for human consumption. This is done to avoid beverage taxes on alcohol that is not meant to be consumed and to prevent poisoning from surrogate alcohol consumption.
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Isopropyl alcohol as a denaturant
Denatured alcohol, also known as methylated spirits, metho, or meths, is ethanol that has additives to make it poisonous, bad-tasting, foul-smelling, or nauseating to discourage its recreational consumption. The main additive is usually methanol (methyl alcohol), which is added to make the mixture toxic.
Isopropyl alcohol, also known as rubbing alcohol, is a toxic substance that is dangerous to consume and behaves as a mild skin irritant. It is generally safe to use and can be found in most hospitals and medicine cabinets. It is produced from the chemical reaction between propylene and sulphuric acid, followed by hydrolysis. Isopropyl alcohol is commonly used to clean medical instruments, disinfect wounds or skin before surgery, and in the preparation of tinctures of iodine for a more potent disinfectant. It is also used to clean electronic components, unlike denatured alcohol, which leaves behind a residue that can affect the sensitive parts of a computer.
Denatured alcohol, on the other hand, is a primary alcohol, meaning the carbon atom of the hydroxyl group is attached to only one alkyl group. It is ethanol that has been treated with denaturants to become poisonous and repellent to humans. These denaturants include toxic or foul-tasting substances such as methanol, benzene, pyridine, castor oil, gasoline, acetone, and isopropyl alcohol. Denatured alcohol typically contains around 90% pure ethanol and 5% toxic denaturants. It is industrially used as a solvent, cleaning liquid, and fuel.
The main difference between isopropyl alcohol and denatured alcohol is that isopropyl alcohol is blended with water, whereas denatured alcohol contains other dangerous additives. Isopropyl alcohol has a milder effect on human skin and is, therefore, added to cosmetic products like hand lotions. Denatured alcohol, on the other hand, can easily irritate and dry the skin.
In terms of toxicity, denatured alcohol is a more potent poison than isopropyl alcohol due to its additional poisonous agents. While isopropyl alcohol is toxic and should not be ingested, it is still less toxic than denatured alcohol. Ingesting isopropyl alcohol can cause vomiting, intestinal bleeding, and even death in severe cases.
In summary, isopropyl alcohol and denatured alcohol share some similarities in their uses, but they have distinct formulas, structures, reactions, and toxicity levels. Isopropyl alcohol is generally safer for human use, while denatured alcohol is primarily used for industrial purposes.
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Why denature alcohol?
Denatured alcohol is ethanol that has additives to make it poisonous, bad-tasting, foul-smelling, or nauseating to discourage its recreational consumption. It is often dyed so that it can be identified visually. Denaturing alcohol does not alter the ethanol molecule chemically or structurally. Instead, the ethanol is mixed with other chemicals to form a foul-tasting, often toxic, solution.
The main additive is usually 10% methanol (methyl alcohol), giving rise to the term 'methylated spirits'. Other common additives include isopropyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, pyridine, benzene, castor oil, gasoline, and acetone. These additives are chosen because they have a boiling point close to that of ethanol and are toxic. Pyridine is added to give the mixture an unpleasant odour, and agents such as syrup of ipecac may be included to induce vomiting.
Denatured alcohol is used as a solvent and as fuel for alcohol burners and camping stoves. It is also used in cosmetics, as an ingredient in hand sanitizers, and in household cleaners. Because of the diversity of industrial uses for denatured alcohol, hundreds of additives and denaturing methods have been used.
The primary reason for denaturing alcohol is to make it unfit for human consumption and avoid beverage taxes. In many countries, sales of alcoholic beverages are heavily taxed for revenue and public health policy purposes. Denaturing alcohol allows it to be sold without these taxes for fuel, solvent, or medicinal purposes.
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Frequently asked questions
Denatured alcohol, or ethanol, is mixed with other chemicals to form a foul-tasting, toxic solution. The most common additive is methanol (methyl alcohol), which gives rise to the term 'methylated spirits'.
Other common additives include isopropyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, pyridine, benzene, castor oil, gasoline, and denatonium.
Methanol is a common additive because its boiling point is close to that of ethanol, and it is toxic. It is also used to dye the solution, making it identifiable visually.
Drinking denatured alcohol can lead to toxicity or even death. It is not meant for human consumption and can be harmful, causing blindness or death if it contains methanol.
