Ethanol Blending Approved in Aviation Fuel

Ethanol Blending Approved in Aviation Fuel

Why in News?

Recently, the Ministry of Petroleum and Natural Gas approved ethanol blending in Aviation Turbine Fuel (ATF), enabling sustainable aviation fuel transition. 

Approval of Ethanol Blending in Aviation Fuel 

• • Legal Recognition: The Ministry of Petroleum and Natural Gas (MoPNG) amended the Aviation Turbine Fuel (Regulation of Marketing) Order, 2001, under the Essential Commodities Act, 1955.
    • This expands the definition of ATF to include blends of conventional jet fuel with sustainable aviation fuel (SAF), which can be produced from renewable feedstocks. 
  • Technical Standardization: The revised rules state that ATF must conform to IS 1571 standards or the IS 17081 standard for synthesised hydrocarbons. 
    • This ensures that blended jet fuel remains safe for existing aircraft engines, enhancing the adoption of cleaner fuel alternatives in the sector. 

• No Mandatory Targets: While there are no immediate mandatory targets for domestic flights, India has set a phased timeline for international routes to meet CORSIA requirements. 

• • The roadmap targets 1% SAF blending by 2027, increasing to 2% by 2028, and reaching 5% by 2030.
• Updated Enforcement Rule: The notification also modernised legal procedures by aligning search and seizure rules with the Bharatiya Nagarik Suraksha Sanhita, 2023. 
  • This ensures that fuel quality and marketing regulations are governed by most current criminal procedure frameworks in India. 

Ethanol-to-Jet Fuel Blending Process 

Ethanol-to-Jet (ETJ) is a process that converts bio-ethanol into aviation-grade fuel under the broader Sustainable Aviation Fuel (SAF) framework.

• Ethanol Dehydration Step: The process begins with dehydration, where ethanol is heated over an acidic catalyst, such as zeolite or alumina, at temperatures between 300°C and 350°C. 
  • This reaction removes water molecules to produce ethylene gas (C₂H₄). 
  • This step converts the oxygenated alcohol into a pure hydrocarbon precursor, which is the essential building block for jet fuel.
• Ethylene Oligomerization Process: In the second stage, oligomerization, the ethylene molecules are chemically linked to form longer carbon chains. 
  • By using specific catalysts, engineers control the reaction to produce liquid olefins with chain lengths typically ranging from C8 to C16. 
  • This specific range matches the energy density and boiling point requirements of conventional kerosene-based aviation fuel.
• Hydrogenation and Saturation: The unsaturated olefins produced in the previous step are highly reactive and unstable.
  • Through hydrogenation, hydrogen gas is added in the presence of a metal catalyst (like nickel or palladium) to saturate the carbon bonds. 
  • This results in Synthetic Paraffinic Kerosene (SPK). This saturation ensures the fuel has high thermal stability.
• Final Fractionation Phase: The final step is fractionation (distillation), where the mixture is separated into specific fuel grades. 
  • While the primary output is SAF, the process also yields valuable co-products like renewable diesel and green naphtha. 
  • The resulting SAF meets the ASTM D7566 international standard and India’s IS 17081 specification, allowing it to be blended up to 50% with traditional Aviation Turbine Fuel (ATF).

Strategic Importance of Ethanol Blending in Aviation Fuel

• Energy Security Boost: Ethanol blending in aviation fuel strengthens India’s energy security by reducing dependence on imported crude oil, currently around 87%.
  • Using domestically produced ethanol diversifies fuel sources and lowers foreign exchange outflow, making the aviation sector less vulnerable to global oil price shocks.
• Lower Carbon Emissions: Ethanol-based Sustainable Aviation Fuel (SAF) significantly cuts lifecycle greenhouse gas emissions by 50–80% compared to conventional ATF. 
  • It also reduces soot and sulfur emissions, supporting cleaner air and aligning with global aviation decarbonization efforts under ICAO climate goals.
• Support to Climate Targets: This blending supports India’s net-zero target by 2070 and commitment to reduce emissions intensity by 45% by 2030. 
  • Aviation contributes about 2–3% of global CO₂ emissions, so shifting to SAF is crucial for achieving carbon-neutral growth in aviation.
• Boost to Farmers and Rural Economy: Increased ethanol demand benefits farmers growing sugarcane, maize, and grains. 
  • It expands the biofuel economy, creates rural jobs, and supports second-generation (2G) ethanol plants using crop residues, reducing stubble burning and enhancing farmer income.
• Industrial and Investment Growth: Ethanol blending drives investment in bio-refineries, SAF plants, and green fuel technologies.
  • Emerging sectors like Alcohol-to-Jet (ATJ) create new industries, attract private and foreign investment, and promote Make in India in clean energy.
• Global Competitiveness in Aviation: Adopting SAF improves India’s position in global aviation, where regions like the EU are mandating SAF use. 
  • Early adoption helps airlines meet future international regulations, avoid carbon penalties, and enhance sustainability credentials.

Challenges

• High Production Cost: Ethanol-to-jet fuel remains significantly costlier than conventional Aviation Turbine Fuel (ATF).
  • Current SAF prices are estimated to be 2–4 times higher than fossil jet fuel.
  • This price gap poses a major financial challenge for Indian airlines operating on thin margins.
• Limited Feedstock Availability: Although ethanol is widely produced, scaling for aviation requires massive additional feedstock. 
  • Competing demand from petrol blending (E20 target), food consumption, and industrial uses creates pressure. 
  • India’s ethanol industry is highly dependent on monsoon-sensitive crops, making it vulnerable to weak rains.
  • The food vs fuel debate and dependence on water-intensive crops like sugarcane further constrain sustainable supply.
• Technological and Scale Constraints: The Alcohol-to-Jet (ATJ) pathway is still in early commercial stages. 
  • Global SAF production accounts for less than 1% of total aviation fuel demand, indicating limited capacity. 
  • Scaling up requires advanced refineries, high capital investment, and technological maturity, which are currently insufficient.
• Infrastructure and Supply Chain Gaps:  India lacks a dedicated SAF supply chain, including large-scale production plants, storage, and distribution networks.
  • Establishing end-to-end infrastructure—from ethanol sourcing to airport delivery—remains a major bottleneck.