Kerosene

Chemical Properties and Grades

Kerosene is a low-viscosity, clear liquid formed from hydrocarbons obtained from the fractional distillation of petroleum between 150 and 275 °C (300 and 525 °F). This results in a mixture with a density of 0.78 to 0.81 g/cm3. It is miscible with petroleum solvents, but it is not miscible with water. The hydrocarbon molecules in kerosene typically contain between 6 and 20 carbon atoms per molecule, and they predominantly contain 9 to 16 carbon atoms. Regardless of crude oil source or processing history, kerosene's major components are branched- and straight-chain alkanes and naphthenes, which normally account for at least 70 percent of its volume.

Aromatic hydrocarbons such as alkylbenzenes and alkylnaphthalenes do not normally exceed 25 percent by volume in kerosene streams. Olefins are usually present at no more than 5 percent by volume. The heat of combustion for kerosene is similar to that of diesel fuel, with a lower heating value of 43.1 megajoules per kilogram and a higher heating value of 46.2 megajoules per kilogram. These properties make it an efficient fuel for both heat and propulsion.

Internationally recognized standards define specific grades of kerosene based on their purity and intended use. ASTM International standards specify two primary grades, 1-K and 2-K, which differ primarily in their sulfur content. Grade 1-K contains less than 0.04 percent sulfur by weight and burns cleaner with fewer deposits and toxins, making it the preferred grade for indoor heaters and stoves. Grade 2-K contains up to 0.3 percent sulfur by weight. In the United Kingdom, standards such as BS 2869 Class C1 define a light grade for lanterns and camping stoves, while Class C2 is a heavier distillate used for domestic heating oil.

Physical Characteristics and Safety

Kerosene is liquid around room temperature, which is 25 °C (77 °F). The flash point of kerosene is between 37 °C (99 °F) and 65 °C (149 °F). Its autoignition temperature is 220 °C (428 °F). The freezing point of kerosene depends on its grade, with commercial aviation fuel standardized at -47 °C (-53 °F). For example, Grade 1-K kerosene freezes around -40 °C (-40 °F).

These physical properties directly inform handling and safety regulations, particularly to distinguish kerosene from more volatile fuels like gasoline. In many jurisdictions, including parts of the United States, regulations mandate specific colour coding for fuel containers to prevent dangerous mix-ups. For example, portable kerosene containers may be required to be blue, while gasoline containers are red and diesel containers are yellow. Such measures are crucial for consumer safety, given kerosene's historical association with fire risks when used improperly in lamps and heaters.

Historical Development and Canadian Origins

The foundational history of modern kerosene is deeply connected to Canadian innovation. While hydrocarbon distillation was known in earlier centuries, the commercial production of a clean-burning lamp fuel was pioneered by Nova Scotia geologist and inventor Abraham Pineo Gesner. In 1846, Gesner demonstrated a process in Charlottetown, Prince Edward Island, where he distilled a clear fluid from coal to create an excellent lamp fuel. He coined the name "kerosene" for this product, derived from the Greek word for wax, and formally registered it as a trademark in 1854.

Gesner's early work in New Brunswick faced legal challenges from the local coal conglomerate over the use of a natural asphalt called albertite. He subsequently moved his operations to New York in 1854, where he formed the North American Gas Light Company. Despite his clear priority, his first patent was granted in 1854, two years after a patent by Scottish chemist James Young for a similar oil-from-coal process. Gesner's purification methods, however, were considered superior, producing a cleaner and better-smelling fuel. For several years, only companies licensed by Gesner could legally use the "Kerosene" trademark in the United States.

The economic landscape for illuminating oils shifted dramatically with the discovery of petroleum. In Canada, petroleum was discovered at Oil Springs, Ontario in 1858, a year before Edwin Drake's famous well in Pennsylvania. The increased supply of crude oil allowed refiners to produce kerosene directly from petroleum, bypassing the coal-based patents held by Gesner and Young. This caused the trade name "Kerosene" to lose its proprietary status and become the generic lowercase term for the fuel. The rise of petroleum-based kerosene in the 1860s had a profound global impact, leading to a steep decline in the whaling industry, which had previously supplied whale oil for lamps.

Modern Production and Refining

In contemporary oil refineries, kerosene is produced through the fractional distillation of crude oil. It condenses at a temperature intermediate between the more volatile naphtha and gasoline fractions and the less volatile diesel fuel. The output of kerosene as a percentage of total refinery yield varies, but in the United States in 2021, it constituted 8.5 percent by volume of petroleum refinery output. Notably, nearly all of this output, 8.4 percent, was kerosene-type jet fuel, highlighting its dominant modern application in aviation.

The refining process carefully controls the hydrocarbon mix to meet strict specifications for different uses, particularly for jet fuel. These specifications govern critical properties like flash point, freezing point, and sulfur content to ensure safety and performance. Additives are also incorporated for purposes such as controlling static electricity and improving stability. While the basic production method from crude oil remains standard, recent experimental projects, such as one by ETH Zurich in July 2022, have demonstrated the solar-powered production of synthetic kerosene from carbon dioxide and water, offering a potential pathway for sustainable aviation fuel.

Primary Applications and Uses

Kerosene's applications are diverse, spanning from global aviation to household use in specific regions. Its most significant modern use is as the base for jet fuel, powering the turbine engines of commercial and military aircraft worldwide. In a highly refined form known as RP-1, it is also used as fuel in some rocket engines. This application leverages kerosene's high energy density and favourable burning characteristics.

For heating and lighting, kerosene maintains importance in various contexts. In Canada and other developed nations, it is commonly used in portable heaters, stoves for camping and backpacking, and as a backup heat source during power failures. In regions like Chile and Japan, it is a standard fuel for installed home heating systems. In less-developed countries, it remains a vital source of energy for cooking and lighting, impacting both household economics and environmental policy, as governments may subsidize its cost to discourage deforestation for firewood.

Historically, kerosene was the primary illuminant before the widespread adoption of electric lighting, leading to the proliferation of kerosene lamps. Specialized lamps using a gas mantle, which contains minerals like thorium dioxide heated to incandescence, produce a whiter, brighter light and are still used in areas without electricity. Other past uses included smudge pots in agriculture to protect crops from frost and "salamander" heaters on construction sites. Before electric road barriers, highway construction zones were often marked at night by kerosene-fired torches, though these typically produced thick, black smoke due to inefficient combustion.

Kerosene in the Canadian Context

Kerosene holds a particular place in Canadian history and contemporary life. Its invention is credited to a Canadian, Abraham Gesner, and the early Canadian oil industry, beginning at Oil Springs, Ontario, contributed to the global shift towards petroleum-based kerosene. This established Canada's early role in the hydrocarbon economy. As a practical fuel, kerosene is especially relevant in Canada's vast northern and remote communities, where it is often used for heating in homes not connected to natural gas pipelines or the electrical grid.

Its use in portable stoves and heaters makes it a staple for outdoor enthusiasts, campers, and those in rural areas. The fuel is subject to specific retail standards in Canada to ensure safety and quality, particularly for indoor use. Environmentally, the combustion of kerosene is a concern, as the World Health Organization classifies it as a polluting fuel due to its emissions of harmful particulate matter. This has spurred research into cleaner alternatives and more efficient burner technologies for domestic use. The story of kerosene in Canada reflects a journey from a foundational technological invention to a continued, though more specialized, role in the nation's energy mix.

Questions about Kerosene

Who invented kerosene?

Canadian geologist and inventor Abraham Pineo Gesner is credited with pioneering the commercial process and coining the name. He demonstrated heating coal to produce a clear lamp fuel in Charlottetown, Prince Edward Island in 1846. He registered the word 'Kerosene' as a trademark in 1854. His method of purifying the distillation products was superior to contemporaries like James Young, resulting in a cleaner fuel.

Is kerosene the same as paraffin?

In many regions, the terms refer to the same fuel. The term 'kerosene' is common in Canada, the United States, Australia, and India. The term 'paraffin' is used in the United Kingdom, Chile, South Africa, and Norway. However, 'paraffin' can also refer to distinct petroleum byproducts like paraffin wax or liquid paraffin (mineral oil), which are different from fuel-grade kerosene.

What is kerosene used for today?

Today, the largest application of kerosene globally is as jet fuel for aviation. It is also widely used as a heating fuel in portable stoves, space heaters, and installed home heating systems, particularly in areas without natural gas service. In many developing nations, it remains a crucial fuel for cooking and lighting. Additional uses include fuel for certain types of lamps, as a solvent, and in specific industrial processes.

Can you use kerosene in a diesel engine?

No, it is not recommended to use standard kerosene in a modern diesel engine. While they are both middle distillates from crude oil, diesel fuel and kerosene have different chemical properties and ignition characteristics. Diesel engines are designed for fuel with a specific cetane rating and lubricity. Using kerosene can lead to poor combustion, reduced lubrication, and potential damage to fuel injectors and pumps. In emergency situations, some older diesel engines might tolerate a temporary blend, but it is not a standard practice.

Why is kerosene dyed?

Kerosene is dyed to prevent confusion with more flammable fuels like gasoline and for tax regulation. For example, in the United States, Pennsylvania requires portable kerosene containers at retail stations to be coloured blue. This contrasts with red for gasoline or yellow for diesel. The dye helps identify the fuel for its intended use and safety.

Is kerosene cleaner than gasoline?

Kerosene is generally less volatile and has a higher flash point than gasoline, making it safer to store and handle. In terms of combustion products, kerosene can produce significant particulate matter and other pollutants, especially when burned in simple wick lamps or inefficient heaters. The World Health Organization considers household use of kerosene a source of indoor air pollution. Compared to gasoline, unburned kerosene poses less risk of explosive vapour accumulation, but both fuels produce emissions that contribute to air pollution and require proper ventilation when used indoors.

Sources: Wikipedia and current public reporting, checked by the Your Space Hamilton desk. Last updated 2026-10-19.