India Explores Isobutanol-Diesel Blending

On 11th September 2025, Union Transport Minister announced that the Automotive Research Association of India (ARAI) is exploring the possibility of blending isobutanol, an alcoholic biofuel, with diesel. This initiative comes after ethanol-diesel blending trials did not meet performance expectations.

Why consider isobutanol for diesel?

Aspect

Ethanol

Isobutanol

Blend Compatibility

Lower miscibility with diesel

Better miscibility; requires no complementary additives

Flash Point

Lower; higher volatility, riskier

Higher; safer for handling and storage

Availability

Surplus in India

Produced from ethanol feedstock if needed

Contribution to Biofuel Goals

Supports net-zero 2070 targets

Offers new avenue for surplus sugarcane utilization

Production and Economics

  • Feedstock: Sugarcane syrup, molasses, grains.
  • Process: Fermentation using engineered microbes designed to produce isobutanol instead ....
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