Ethanol-LPG: Ethanol, found in petrol, could replace your cooking gas in the future. It could be much cheaper than LPG. Union Minister Nitin Gadkari recently said, “7 percent ethanol mixed with water produces a stove-like flame and is cheaper than LPG. This is a completely indigenous technology.” This statement has once again brought alcohol-based fuels into the discussion for domestic kitchens. Let’s understand whether ethanol can truly replace LPG and does science support this claim?
What is an ethanol stove and its features?
Ethanol stoves are a modern cooking technology. They operate on biofuels derived from crops like sugarcane or corn. They can be considered a better alternative to LPG cylinders. Their specialty is that they provide a high heat like LPG, without the smoke, odor, or soot. They operate on both liquid and gel ethanol fuels. They can also prove to be an excellent alternative for health and the environment.
Can ethanol mixed with water burn?
Ethanol is a flammable alcohol. It is already widely used as a Biofuel in vehicles. LPG is a pressurized hydrocarbon gas, while ethanol is a liquid fuel. It ignites when enough of its vapor combines with oxygen in the air to reach ignition temperatures. According to Reports, scientific research suggests that the concentration of ethanol is crucial.
Studies published in the Journal of Loss Prevention in the Process Industries found that diluting ethanol with water can make it difficult to burn consistently. In fact, water slows down the formation of flammable vapors. Mixtures containing less than 7 percent ethanol often fail to maintain a stable flame under normal conditions. This is why alcoholic beverages like beer don’t catch fire easily.
Commercial ethanol stoves use concentrated ethanol
In reality, commercial ethanol stoves don’t burn such a thin mixture. They typically run on ethanol concentrations of 70 to 90 percent or more. This produces ample vapor and a clean, consistent blue flame, much like LPG. Chemically, pure ethanol has a flash point of about 13 degrees Celsius, meaning it can produce flammable vapors even in cold weather. However, as the water content increases, the vapor pressure decreases, and the water absorbs heat, making combustion more difficult. Research also shows that ethanol-air mixtures only burn when the vapor content is within a certain flammable limit.
Is Gadkari’s claim scientifically correct?
Gadkari’s claim is entirely feasible if the stove uses sufficiently concentrated ethanol, and the burner is designed to properly vaporize the fuel. So, a mixture of only 7 percent won’t ignite directly, but with the right engineering and concentration, the technology is feasible. Its affordability depends entirely on fuel prices, the scale of ethanol production, and the distribution structure.
