Denatured alcohol, also called methylated spirits (in Australia, New Zealand, South Africa, and the United Kingdom) or wood spirit or denatured rectified spirit, is ethanol that has additives to make it poisonous, bad-tasting, foul-smelling, or nauseating to discourage recreational consumption. It is sometimes dyed so that it can be identified visually. Pyridine, methanol, or both can be added to make denatured alcohol poisonous, and denatonium can be added to make it bitter.
Denatured alcohol is used as a solvent and as fuel for alcohol burners and camping stoves. Because of the diversity of industrial uses for denatured alcohol, hundreds of additives and denaturing methods have been used. The main additive has traditionally been 10% methanol, methyl alcohol, giving rise to the term "methylated spirits". Other typical additives include isopropyl alcohol, acetone, methyl ethyl ketone, and methyl isobutyl ketone.
In the United States, mixtures sold as denatured alcohol often have much greater percentages of methanol, and can be less than 50% ethanol.
Denaturing alcohol does not chemically alter the ethanol molecule unlike the denaturation process in biochemistry. Rather, the ethanol is mixed with other chemicals to form a foul-tasting, often toxic, solution. For many of these solutions, it is intentionally difficult to separate the components.
In many countries, sales of alcoholic beverages are heavily taxed for revenue and public health policy purposes (see Pigovian tax). In order to avoid paying beverage taxes on alcohol that is not meant to be consumed, the alcohol must be "denatured", or treated with added chemicals to make it unpalatable. Its composition is tightly defined by government regulations in countries that tax alcoholic beverages. Denatured alcohol is used identically to ethanol itself except for applications that involve fuel, surgical and laboratory stock. Pure ethanol is required for food and beverage applications and certain chemical reactions where the denaturant would interfere. In molecular biology, denatured ethanol cannot be used for the precipitation of nucleic acids.
Denatured alcohol has no advantages for any purpose over normal ethanol; it is a public policy compromise. As denatured alcohol is sold without the often heavy taxes on alcohol suitable for consumption, it is a cheaper solution for most uses that do not involve drinking. If pure ethanol were made cheaply available for fuel, solvents, or medicinal purposes, it would likely be used as a drink by some people.
Despite its poisonous content, denatured alcohol is sometimes consumed as a surrogate alcohol. This can result in blindness or death if it contains methanol. For instance, during the Prohibition in the United States, federal law required methanol in domestically manufactured industrial alcohols. From 25–27 December 1926, which was roughly at the midpoint of the "Noble Experiment" of nationwide alcohol prohibition, 31 people in New York City alone died of methanol poisoning. To help prevent this, denatonium is often added to give the substance an extremely bitter flavour. Substances such as pyridine are added to give the mixture an unpleasant odour, and agents such as syrup of ipecac may also be included to induce vomiting.
Diverse additives are used to make it difficult to use distillation or other simple processes to reverse the denaturation. Methanol is commonly used both because its boiling point is close to that of ethanol and because it is toxic. Another typical denaturant is pyridine. Often the denatured alcohol is dyed with methyl violet.
There are several grades of denatured alcohol, but in general the denaturants used are similar. As an example, the formulation for completely denatured alcohol, according to 2005 British regulations was as follows:
Completely denatured alcohol must be made in accordance with the following formulation: with every 90 parts by volume of alcohol mix 9.5 parts by volume of wood naphtha or a substitute and 0.5 parts by volume of crude pyridine, and to the resulting mixture add mineral naphtha (petroleum oil) in the proportion of 3.75 litres to every 1000 litres of the mixture and synthetic organic dyestuff (methyl violet) in the proportion of 1.5 grams to every 1000 litres of the mixture.
The European Union agreed in February 2013 to the mutual procedures for the complete denaturing of alcohol:
Per hectolitre (100 L) of absolute ethanol: 3 litres of isopropyl alcohol, 3 litres of methyl ethyl ketone and 1 gram denatonium benzoate.
Specially denatured alcohol
A specially denatured alcohol (SDA) is one of many types of denatured alcohol specified under the United States Title 27 of the Code of Federal Regulations Section 21.151. A specially denatured alcohol is a combination of ethanol and another chemical substance, e.g., ethyl acetate in SDA 29, 35, and 35A, added to render the mixture unsuitable for drinking. SDAs are often used in cosmetic products, and can also be used in chemical manufacturing, pharmaceuticals, and solvents. Another example is SDA 40-B, which contains tert-butyl alcohol and denatonium benzoate, N.F. In the United States and other countries, the use of denatured alcohol unsuitable for beverages avoids excise taxes on alcohol.
- "Methylated Spirits". www.diamondspirit.net. Retrieved 1 September 2018.
- "Ethanol Denaturants". The Online Distillery Network. 22 November 1993.
- Gelling, Cristy (13 June 2012). "Which Type of Ethanol Should I Use? - Bitesize Bio". Bitesize Bio. Science Squared. Retrieved 13 April 2016.
- Helmenstine, Anne Marie (23 March 2018). "What Is Denatured Alcohol? Composition, Examples, and Effects". ThoughtCo. Retrieved 11 March 2017.
- Blum, Deborah (19 February 2010). "The Chemist's War". Slate. Archived from the original on 6 August 2018.
- Gates, Charlie (14 April 2010). "Meths drinking on the increase". stuff.co.nz.
- "Denatured Ethanol Group Standard 2006" (PDF). Environmental Protection Authority. Archived from the original (PDF) on 10 April 2017. Retrieved 2 November 2014.
- Naim Kosaric, Zdravko Duvnjak, Adalbert Farkas, Hermann Sahm, Stephanie Bringer-Meyer, Otto Goebel and Dieter Mayer in "Ethanol" Ullmann's Encyclopedia of Industrial Chemistry, 2011, Wiley-VCH, Weinheim. doi:10.1002/14356007.a09_587.pub2
- "The Denatured Alcohol Regulations 2005". Office of Public Sector Information. 2005.
- "Commission Implementing Regulation (EU) No 162/2013 of 21 February 2013". Official Journal of the European Union. 22 February 2013.
- Section. Edocket.access.gpo.gov. Retrieved on 29 May 2011.
- What is specially denatured alcohol (SDA)? definition and meaning. Businessdictionary.com. Retrieved on 29 May 2011.
- TTBGov Denatured Alcohol. Ttb.gov. Retrieved on 29 May 2011.
- 2004 CFR Title 27, Volume 1 Archived 14 March 2012 at the Wayback Machine. access.gpo.gov. Retrieved on 29 May 2011.